dlp training manual

8/14/2019 DLP Training Manual

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SAFETY INFORMATION CAUTIONSafety information is contained in the appropriate Thomson Consumer Electronics ServiceData. All product safety requirements must be complied with prior to returning the

instrument to the consumer. Servicers who defeat safety features or fail to perform safety

checks may be liable for any resulting damages and may expose themselves and others to

possible injury.

All integrated circuits, all surface mounted devices, and many

other semiconductors are electrostatically sensitive andtherefore require special handling techniques.

First Edition 0328 - First Printing

Copyright 2003 Thomson

Trademark(s)Registered Marca(s) Registrada(s)

Printed in U.S.A.

Prepared by

Thomson

Technical Training Department, INH905

PO Box 1976

Indianapolis, Indiana 46206 U.S.A.

This publication is intended to aid the technician in servicing the HDLP50W151

television. This manual will explain the basic theory of operation of the major modules.

This manual covers the AC In CBA, Formatter CBA, Audio CBA, A/V In/Out CBA and

the Light Engine along with practical troubleshooting tips and suggestions. It isdesigned to assist the technician in becoming familiar with chassis operation, increase

confidence and improve overall efficiency in servicing the product.

Note:This publication is intended to be used only as a training aid. Never use training

diagrams alone to troubleshoot. It is not meant to replace service data. TCE Electronic

Service Information for this instrument contains specific information about parts, safety

and alignment procedures and must be consulted before performing any service. The

information in this manual is as accurate as possible at the time of publication. Circuit

designs and drawings are subject to change without notice.

FOREWORD


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CONTENTS

Introduction ................................................................................5

Chassis Introduction & Electrical Overview ..............................9DLP Technology Overview .........................................................12

Light Engine Overview .............................................................15

AC In CBA Overview (power supplies) .....................................20

DM2CR Overview.......................................................................22

Formatter CBA Overview...........................................................24

Audio Switching Overview........................................................26

Audio Processing Overview .....................................................28

Video Switching Overview...........................................................30

Service Tips ...............................................................................32

Service Menu's & Diagnostics...................................................32

Troubleshooting.........................................................................33


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Fig. 1 HDLP50W151

IntroductionThe RCA Scenium HDLP50W151uses Digital Light Processing (DLP)

Technology from Texas Instruments

(TI) to display a high quality HDTV

picture in a lightweight cabinet. The

heart of DLP Technology is a specially

design semiconductor, a color wheel,

and a high output light bulb. These

devices are housed in a cabinet that is

16" deep and weights approximately

100 pounds. These advantage makethe TV a pleasure to watch and to

position in most viewing locations

Improved serviceability is another

advantage televisions using DLP

Technology. The set is lightweight

and easy to move or place on a bench.

Electrically, the set contains six

modules. There is no component

level troubleshooting. Alignments are

also reduced. With DLP Technology,

convergence and geometry

alignments are not needed. The

HDLP50W151 has only one

mechanical and couple electrical

adjustments.

There are basically three things about

HDTV that provides a superior viewing

experience: (1) resolution, (2) aspect

ratio, and (3) digital video and digital

sound.

ResolutionResolution is measured by calculating

the number of active lines of pixels. A

analog NTSC television only has a


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resolution of about 200,000 pixels (480

vertical pixels x 440 horizontal pixels

= 211,200 pixels). The HDTV (ATSC)

format is capable of more than 2 million

pixels (1,920 x 1,080 = 2, 073,600).

More pixels equals more detail in the

picture. In summary, HDTV is capable

of resolution that is up to 10 times the

resolution of the picture on a regular,

analog TV.

Aspect RatioWhen the standards were being

developed for television broadcasting

in 1941 by the NTSC (National

Television Standards Committee), it

made sense to adopt the 4 x 3 aspect

ratio that the film industry was using atthat time. The 16 x 9 aspect ratio was

originally developed back in the 50s

by the movie industry (also called wide-

screen format). When the standards

for ATSC were being developed by

the Advanced Television Standards

Committee, the 16 x 9 aspect ratio

was chosen as the format for HDTV.

This widescreen format makes sense

because its much closer to the way

we see. Our field of vision is actuallymuch wider than tall because of our

peripheral vision.

Digital Video Signal and Digital

SoundThe analog television broadcast

system (NTSC) that has been used in

the United States for the past 50 years

transmits signals as analog electronic

waves. These waves can suffer

degradation as the signal travels tothe receiver. Digital signals, in

contrast, can be reproduced precisely

because the images are transmitted

and received digitally. This produces

a signal that is capable of displaying

studio-quality video and Dolby Digital

5.1 channel sound.

HDLP50W151 Features

The picture settings can be

customized to fit viewing taste and

match the lighting conditions where

the unit is located by using personal

presets and/or the automatic picture

quality settings: Vibrant, Natural,Cinematic. Each Input Jack can be

adjusted to a different setting and the

unit automatically adjusts the picture

settings to its unique value when that

input is selected.

Elaborate on-screen Help Text helps

the user learn more about the features

of the HDLP50W151 and helps them

to use them more effectively.

The GUIDE Plus+ System on-screen

programming guide helps the user

navigate through hundreds of

channels so they can quickly see

whats on and tune directly to a specific

show from the guide. The user can

use the Sort feature to search listings

and can even set up reminders to

watch a certain show via the GUIDE

Plus+ systems Watch menu.

Integrated ATSC Tuner with QAM

Thomson was the first to offer an

integrated ATSC tuner in its HDTVs

(no need for a set-top box to receive

and decode over the air ATSC

programming). The new tuner in the

HDLP50W151 can also decode the

QAM (Quadrature Amplitude

Modulation) digital cable signal. There

is no need for a cable box to view non-

encoded standard, digital cable

programming.

Note: a cable box is necessary to

view scrambled (encoded) and/or

premium channels.


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Fig. 2 HDLP50W151 with stand

FireWire with Two-Way

DTVLinkHookup and control 1394 (FireWire)

components via the HDLP50W151.

This is accomplished via the 2-way

DTVLink jacks and you can network

high-speed compatible 1394 digital

components. The two-way jacks allowthe audio and video signals to flow in

and out of the 1394 components.

NetConnect

With an Ethernet connection and a

web browser built into the instrument,

the internet can be accessed directly

from the TV. A high-speed connection,

such as a DSL (Digital Subscriber

Line) unit or cable modem is needed

to use the web browser, along with a

subscription to an ISP (internet service

provider). Additionally, HDLP50W151

enables access to digital photos

directly from a PC and display them

on the TV. The browser has limitations

and might not be able to interpret all

files, such as streaming audio, video

and PDFs.

Audio SystemThe sound system in HDLP50W151

has a total of 60 watts total power. It

has front speakers with two 1" tweeters


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Fig. 3 HDLP50W151 side view

and two 5" midrange drivers to create

incredible sound. A 7-band on-screen

graphic equalizer allows customizationof the sound quality. SRS TruSurround

provides surround sound technology

and with two rear speaker outputs.

For those who want to hook up a

home theatre audio system, there is

an optical Dolby Digital output as well

as a 50-watt center channel input.

Record Output JacksBecause the VCRs in most

households are analog and cantrecognize the ATSC digital signal,

recording HDTV broadcasts wasnt

possible without purchasing additional

equipment. For this reason a Video

Record Output Jack and Audio Output

L/R jacks are provided on the

HDLP50W151. These video and

audio output record jacks enables the

recording of both NTSC analog and

ATSC digital programming.CinemaScreenCheck out the black, borderless frame

around your HDTVs screen. This is

not just a design feature the

CinemaScreen actually improves

contrast by providing a brighter,

sharper picture. Feel like youre part

of the picture with CinemaScreen.

Digital Light Processing, DLP are

trademarks of Texas Instruments. All otherproducts and names may or may not be

trademarks or registered trademarks of

their respective companies.


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Light Engine Lamp Power Supply

Lamp Assembly

Standby & RunPower Supply CBA

DM2CR

A/V In/Out CBA

Audio CBA

Formatter CBA

Fig. 4 HDLP50W151 Light Engine Assembly

Fig. 5 ATC311 Chassis Assembly

Chassis Introduction &

Electrical Overview

The chassis in the HDLP50W151 is

made up of seven (7) major modules.

These include the AC In CBA which

contains the Standby and Run powersupplies. The Audio CBA which

processes all audio signals. The A/V

In/Out CBA has the in/out jacks and

also does all the video and audio

switching. The fourth is the Formatter

circuit board and it is responsible for

converting the video signals into a format

that the light engine can use. The fifth

is the DM2CR which contains the

ATSC tuner, NTSC tuner and the QAMdigital cable decoder. The DM2CR also

serves as the system control for the

instrument. The sixth module is the

light engine and seven is the lamp power

supply.


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V-Sync

H-Sync

Y

Pr

Pb

AC In CBA

FormatterCBA

AudioCBA

A/V In/OutCBA

StandbyPower Supply

Run (Main)Power Supply

Bridge

120VAC

DoublerRelay

DM2CR

FrontA/VIn

LeftX-over

RightX-over

+12VS

Aud-Pwr

3.3V & 2.5V

Pwr_

Good

+5VR

+12VR

+9VR

Pwr_Good

+5VR

+12VR

+3.3VR

+2.5VR

BEP

EEPROM

Red

Green

H/V SyncV-Sync

H-Sync

FSW

Y

Pr

Pb

Tx/lamp_Lit

Rx/Dim

SW

+9VR

IR FPA Lite Pipe

+6VS

+12VS

+6VS

+5VR

+5VS

SW

-5VS

+12VR

+33VS

PwrFail

On/Off

Degauss

BlueIV401

BV401

BV402 BW901

BW902

Chroma/LumaDRAM

IW702/03/4/05/06/07

BP503

4

12

14

13

5

6

7

8

10

2

1

5

3

8

7

J24603 +21V

-21V

13

J24604

J24605

J2460216

1

2

4 14J24702

J24251

J24252

6 4 2 8 1314

J11903J11501

J11902

J11901

J12101

J22101

J26903

J26901

J26905

J28901

J26904

J32401

J32402J26104

J23401 J23402

IW501

J13602

J13604

J13603

J22104

J22105

1 38 13

Digital SignalProcessing

Luma

IW702/3/4

Reg

IW601IW701IW801IW901

2

1

7

18

2329DVI Video

5

6

2

I C_Dat2

I C_Clk2

I C_Clk2

I C_Dat2

(RUN 2)

(RUN 2)

2

5

9

3

12

ToLightEngine

ToLampPwrSuply

ToLampDoorSwitch

ToLight

Engine

Fig. 6 Chassis Block Diagram and Interconnect

Chassis Electrical Overview

There are five (5) major circuit boards in

the HDLP50W151 chassis (minus the

light engine). These include the AC InCBA, Audio processing CBA, the

DM2CR, the A/V In/Out CBA and the

Formatter CBA.

The AC In CBA provides the Standby

DC power and the Run supply DC power.

Both power supplies are switch mode

power supplies and are very similar.

The main difference is that the run

supply has an on/off circuit that is

controlled by the system control micro

in the DM2CR.

An AC doubler on the AC In CBA is

used to generate power for the lamp

power supply.


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Note:A valuable

troubleshooting tip is to listen

for the lamp power supply

relay click when AC is plugged

in. Since the relay is power by

the +12VS source, if the relay

doesnt click this is a good

indication the standby power

supply is inoperative.

The Audio CBA is responsible for final

processing of all baseband audio

signals. This includes volume,

equalization, balance and Surround

Sound. The audio output power

amplifiers that drive the internal

speakers are also located on the Audio

CBA. Audio for the audio out jacks as

well as the FAV (Front Audio Video)

circuit are supplied by the Audio CBA.

Power (+/-21V) for the Audio CBA is

provided by the standby supply.

The DM2CR module contains both an

NTSC and ATSC tuner section as well

as the NTSC PIP tuner (see DM2CR

Module Overview for more details).The

tuners are capable of processing both

digital and analog RF signals (ATSC &

NTSC) from either terrestrial or cablesources. The DM2CR is also 256QAM

digital cable compatible. The DM2CR

has 2 DTV Link connectors which are a

compressed digital video inputs offering

an IEEE-1394 type video connection

for consumer devices such as satellite

receivers, cable receivers, and digital

recorders that meet the CEA

specifications for DTV Link. DTV Link is

better known as 1394 or FireWire fordigital televisions. Audio and video

information is carried on a single wire.

The DM2CR module performs the

NTSC decoding of component, SVHS,

and composite video signals. The

DM2CR also recovers the teletext,

closed caption and GemStar data

signals that accompany any input video.

All 1H video inputs (NTSC) including

signals from the A/V In/Out circuit board

are up-converted to 2H by the DM2CR.

The video output to the formatter CBA

is YPrPb component. Any 2H

component (YPrPb) that is input to the

A/V In/Out CBA is routed directly to the

formatter.

The audio and video in/out jacks are

located on the A/V In/Out CBA. The A/

V CBA also provides audio and video

switching for external video and audio

signals. The auto detected 1H and 2H

video signal are routed via the A/V In/

Out circuit board. The 1H and 2H NTSC

is routed to the DM2CR for up-

conversion. Any 2H component external

video signal is routed directly to the

formatter circuit for final processing.

The formatter circuit board is responsible

for converting the analog video from

either the DM2CR or the analog inputs

from the A/V In/Out circuit board into a

format that is compatible with the light

engine. All functions and circuits on the

formatter circuit board is monitored and

controlled by the system control

microcomputer in the DM2CR module.This is accomplished via the RUN 2 I2C

clock and data bus. The same I2C bus

is also routed through the formatter

board to the light engine. The 2H and

2.14H external video inputs are applied

to the formatter circuit board (via

connector BV402) where it is applied to

the BEP (back end processor) for

processing into an analog RGB signal.

The NTSC and the ATSC analog videosignal (2H) from the DM2CR is also

input to the formatter (via connector

BV401). The video is applied to IV401

for conversion to RGB. The RGB output

from IV401 is then applied to the Digital

Signal processing circuits where it is

digitized and output to the light engine

as DVI (Digital Video Interface).


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MMD (DLP) Technology Overview

Fig. 7 DLP Device (MMD)

Fig. 8 Micro Mirror Device(Exploded View)

Graphics, text and artwork courtesy of Texas

Instruments. Digital Light Processing, DLP are

registered trademarks of Texas Instruments.

Texas Instruments Digital LightProcessing (DLP) technology provides

an all digital projection display that offers

superior picture quality in terms of

resolution, brightness, contrast, and

color fidelity. The DLP device consists

of an array of movable mcromirrors.

Each mirror is independently

controllable and is used to modulate

reflected light. The mirror is controlled

by loading data into the memory cell

located below the mirror. The data

electrostatically controls the mirrors tilt

angle which controls whether passes

through the projection lens and onto a

screen or reflected away.

Until recently, light-valve technologies

for projection display applications have

been unable to take full advantage of

the economies and stability offered by

the digital revolution. Increasing digital

content has been incorporated into the

transmission and signal processing

chain from source material to theprojection display light valve. Ultimately,

however, the light valve itself is analog

in nature and subject to analog


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limitations. The possibility of an all-

digital (source-to-eye) display was

realized in 1987 with the invention of

the DLP device at Texas Instruments.

The DMD is an array of fast digital

micromirrors, monolithically integrated

onto and controlled by a memory chip.

Digital Light Processing (DLP) systems

present bright, seamless images to the

eye, with the characteristics that we

have come to expect from digital

technology, namely high image fidelity

and stability. DLP-based displays

exhibit no lag or smearing of the imagefrom one digital frame to the next. The

first DLP-based projection display

products were introduced to the market

in April 1996.

DISPLAY OPERATION

As shown in Figure 8, each digital light

switch of the DMD is an aluminum

micromirror, 16 micrometer square, that

can reflect light in one of two directions,

depending on the state of an underlying

memory cell. The mirror is rotated by

electrostatic attraction produced by

voltage differences developed across

an air gap between the mirror and the

memory cell. The mirror rotation is

limited by mechanical stops to 10

degrees. With the DLP cell in the on

state, the mirror rotates to +10 degrees.

With the DLP cell in the off state, the

mirror rotates 10 degrees.

When we combine the DLP device with

a suitable light source and projection

optics, the mirror reflects incident light

either into or out of the projection lens

by a simple beam-steering action. Thus,

the on state of the mirror appears bright

and the off state of the mirror appears

dark. The fast switching time of the

mirrors enables the use of a pulse width

modulation technique for the production

of gray scale. The DLP device accepts

electrical words representing gray levels

of brightness at its input and then outputs

digital light as optical words to the eye.Because of the short pulse duration,

the optical words are interpreted by the

eye of the observer as analog light

containing up to one billion or more

color and gray scale combinations per

pixel. Furthermore, the fast switching

time results in a lag free image. Digital

light is accurate because the light pulse

durations are determined by the precise

division of time. The resulting projected

image faithfully reproduces the originalsource material and the image is stable,

independent of temperature or age of

the projector, and is free from photo

degradation effects, even up to

brightness levels necessary for

electronic cinema. The tiny gaps

between the mirrors diminish

objectionable pixilation effects and

create a seamless image that has long

been the hallmark of DMD-basedprojection displays.


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Fig. 9 One chip Projection System

DISPLAY CONFIGURATIONS

Three configurations of DLP projection

systems are currently being

manufactured, differentiated by the

number of chip, one, two, or three. The

HDLP50W151 uses a one chip

configuration and Figure 9 shows a

simplified example of a one-chip system.

The configuration choice depends on

the intended market application and is

based on a tradeoff between light

utilization efficiency, brightness, power

dissipation, lamp technology, weight,

volume, and cost. The single-chip

projector is self-converged, lower in cost,and permits the very lightest portable

designs.

Graphics, text and artwork courtesy of

Texas Instruments. Digital Light

Processing, DLP are registered

trademarks of Texas Instruments.


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Driver CBA

Light Tunnel

DLP Device

Fig. 10 DLP Light Engine

Fig. 11 DLP Light Engine

Light Engine Overview

The imager in the light engine is a single

DLP device with an array of 1280x720

(921,600) micro-mirrors. Another part

of the light engine is thecolor wheel that

is used to sequentially display red,

green, and blue images on the imager.

The light engine contains a Driver circuit

board that contains the TI chipset.

Alignment information is stored in a

EEPROM located on the engine driver

board. These alignments include color

temperature and color wheel index.

Two cooling fans are located in the light

engine, one for the DMD device and

one for UHP (Ultra High Pressure) lamp.

Color Wheel Operation

The color wheel contains 6 segments; 2

reds, 2 greens, and 2 blues and spins at

a rate of 120Hz. This means for every

incoming 60Hz frame from the chassis,

12 color sub frames are displayed on

the imager at a rate of 720Hz.


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Fig. 12 DLP Light Engine Block Diagram

Inputs to Light Engine

The inputs to the light engine include

the Power Supplies (+2.5V, +3.3V,

+12V, +5V).

The Power_Good signal is an active

high signal which indicates that all of

the supplies are at an acceptable level.

This signal is used to give the engine an

advance warning that the supplies are

going down in case of an AC loss. The

Power_Good signal must go low a

minimum of 1ms prior to the supplies

dropping so that the light engine

processing circuitry can park the mirrorsin a reliable state prior to power loss.

Another input is the DVI encoded video

from the formatter circuit. Control of the

light engine is accomplished via the I2C

Run 2 data bus from the DM2CR

module.

Cooling fans

Two cooling fans are powered by the

light engine driver board. The DLP fan

speed is varied depending on thetemperature around the light engine.

The temperature is monitored by the

DM2CR by reading a temperature

sensor via the I2C bus. Under normal

conditions the fan voltage should be

about 8V but can rise to a maximum of

12V as the temperature rises. Fan

rotation is monitored by DM2CR. When

a stopped or locked fan is detected the

DM2CR shuts down the instrument

down and fan error codes are logged.

LightEngine

DLPDriverCBA

LightEngine

Housing

CWMotor

Temp Sensor

Mtr1

Mtr2

Mtr3

CW Index H

CW Index L

Lamp Fan

DMDFan

FanDrive

LVDS_B

LVDS_A

Fan PWM

Lamp_en

ThermalCut OffSwitch

DLPProcessing

Pwr_Good

+5VR

+12VR

+3.3VR

+2.5VR

Fan Detect

I C_Clk2

I C_Dat2

RDRAM

FLASH

EEPROM

Bus ExpDVI Rx

DDP1010

J1

J2

J7

J8

P1

J4

To Lamp Pwr Supply

LampOnJ5

FromLampPwr

Supply

Tx0Tx1Tx2TxC

DVI VideoFrom Formatter CBA

J3Thermal Cut Off

DLPDevice

(RUN 2 Bus)


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Power

Power_Good

TI_Reset

Ballast_Lamp_en

Ballast_Txd_Lamplit

User_Lamplit

DDP1010 State

DMD State

Reset Init CW Init Lamp Reset Init I2C I2C DelayUnparkMirrors

Running

Mirrors Parked Display Image

Fig. 13 DLP Light Engine Startup Sequence

Engine Start up

Figure 13 shows the startup sequence

of the light engine. The light engine

takes approximately 10 seconds to

power up and display a picture after the

power button is pressed. It takes most

of this time for the lamp to come up to

full brightness.

1. After Power supplies and the

Power_Good are up, the micro

brings the DLP processing circuitry

out of reset by writing to the light

engine bus expander IC.

2. Once the DLP processing circuitry is

brought out of reset, The micro inthe DLP processing circuitry begins

initialization of the engine. The first

step is to start the color wheel

spinning up to an acceptable rate

(720RPM).

3. Once the DLP processing circuitry

senses the wheel is spinning OK, it

will then strike the lamp by activating

the lamp_en signal to the ballast.

The DDP1010 then waits to receive

the User_Lamplit signal

4. The DM2CR microprocessor polls

the bus expanding reading the

Ballast_lamplit input pin. This signal

comes from the ballast and indicates

that the lamp has started

successfully. When the micro

detects this signal, it then passes it

along to the DLP processing circuitry

by outputting the User_Lamplit

signal.

5. When the DLP processing circuitry

sees the User_Lamplit signal, it does

a soft reset and is ready to receive

I2C commands from the DM2CR

and to display video.


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Lamp Startup-Cool Down

When the set is tuned off via the powerbutton or remote, the unit displays a

blue screen and slowly dims the screen

leaving the lamp and power supplies on

for about 20 seconds. During this 20

second interval the user can turn the set

back on immediately in case he

inadvertently shut it off (refer to Fig. 14).

After the 20 second interval, the lamp is

turned off but the run supplies and fans

are left on for an additional 2 minutes to

allow for lamp cool down. After thelamp is turned off, the user will not be

allowed to turn the set on for 30 seconds.

If he tries to the power LED will flash

which indicates the lamp is in cool down

mode.

UHP (Ultra High Pressure) lamps can

be damaged during a hot strike (when

the lamp is turned on before it has had

a chance to cool down from the previous

on time). Because of this issue thefollowing sequence is used is use to

power up and shut down the lamp.

Power On: The UHP (Ultra High

Pressure) lamp can be damaged or its

life span shortened by turning it on while

hot (a hot strike). For this reason,

multiple protective measures have been

taken in the form of multiple timers.

When the Power button on the front

panel or the remote control is pressed,

the TV & the Lamp turns on immediately.

Display Mode: Both the lamp and the

video and audio are turned on

immediately when the power button is

pressed. When the unit is powered on,

video can be seen in approximately 10

seconds, however full brightness takes

approximately 25-30 seconds due to

lamp warm-up time.

Power Return: In the case of a power

outage, when the power returns a 30

second timer is activated. The unit will

not turn back on before the 30 seconds

have timed out because the system

doesnt know if power was lost for 10

seconds or 10 minutes, therefore thesystem must ensure that the lamp has

cooled before turning on.


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Page 19

Fig. 14 DLP Lamp Startup-Cooldown

PowerReturn

30 SecTimer **

20 SecTimer *

** If Power On is pressed during the

30 sec Cool timer, the Power LED blinks.

* If Power On is pressed during the

20 sec Lamp Standby timer, the set returns to normal operation immediately.

Cool Down'Lamp Off-Fans On'

Video 10 Sec

Full Bright 25 Sec

Display Mode Lamp Standby

TV & LampOff

(Fans Off)

30 SecTimer

PowerLoss

Fans Off

PowerOn

Lamp OnVideo On

Lamp On-Vid/Audio Mute

Pwr On

Power Off

2 MinTimer

Lamp Standby: Whenever the unit is

powered off, video is immediately

blanked but the lamp remains on. A

20 second timer is activated. This is

done in case the customer accidentally

turned off the unit or has changed their

mind. If power on is pressed before the

20 second timer runs out, video is

immediately unblanked.

Lamp Cool-Down:After the standby

timer expires (20 seconds), the lamp is

turned off and enters the Cool-Down

mode. When the lamp is turned off two

timers are activated. The first is a 30

sec timer that prevents the instrument

from being turned on until the cool-down timer has expired. After 30

seconds, the unit can be powered up

again. If the Power On is pressed

before the 30 second cool down timer

has expired, the Power LED blinks

slowly. Its important to realize that this

is normal and is done to protect the

lamp. After the 30 seconds cool down

timer expires the unit will start normally.

The second is a two minute timer that

keeps the fans running to cool the lamp

if the unit is left off.

When the set is tuned off via the power

button or remote, the unit displays a

blue screen and slowly dims the screen

leaving the lamp and power supplies on

for about 20 seconds. During this 20

second interval the user can turn the set

back on immediately incase he

inadvertently shut it off. After the 20

second interval, the lamp is turned off

but the run supplies and fans are left onfor an additional 2 minutes to allow for

lamp cool down. After the lamp is

turned off, the user will not be allowed to

turn the set on for 30 seconds. If he tries

to the power LED will flash which

indicates the lamp is in cool down mode.


20/38

Page 20

AC In CBA Overview

The standby and main (run) power

supplies are located on the AC In circuit

board. The standby supply is onwhenever the unit has 120V AC applied.

A voltage multiplier is also located on

the AC In CBA. This multiplier produces

the high voltage that is required for the

lamp power supply. The relay that

routes the AC to the doubler is the relay

that is heard when the unit is plugged in.

The relay is operated by routing the

+12VS voltage through the lamp door

switch. This is a safety feature that

shuts off the lamp and supply when the

customer accessible lamp door is

opened.

The outputs of the standby supply

includes +/- 21V for the Audio circuit

board, +6VS, +5VS, -5VS, +12VS and

+33VS to the DM2CR. A power fail

(PwrFail) signal is generated by the

standby supply and is routed to the

DM2CR is the event that AC is lost or

that supply malfunctions. The PwrFail

signal is an early warning for the DM2CR

to perform emergency shutdown

housekeeping procedures.

Fig. 15 AC In CBA Block Diagram

AC InCBA

LampDoor

Switch

Standby

Power Supply

Main (Run)

Power Supply

Bridge

VoltageMultiplier

Relay

+12VS

Pwr_Good

+5VR

+12VR

+9VR

SW

+12VS

+6VS

+5VR

+5VS

SW

-5VS

+12VR

+33VS

PwrFail

On/Off

13 7

+21V

-21V

J24603

120VAC

5

1

3

J24604

J24605J24602

16

1

2

4 14J24702

J24251

J24252

2

1

J13101

2

1

6 4 2 8 1314

To DM2CR ToAV In/Out

CBA

ToFormatter/Driver

CBA

+6VSTo

DM2CR

ToAudioCBA

ToLamp

PwrSupply

On/Off


21/38

Page 21

The main (run) supply provides the

+5VR and the +12VR that is required by

the A/V In/Out circuit board. The +9VR,

+12VR, +5VR and the Power_Good

signal are generated by the run supply.

The Power_Good signal informs the

light engine (via the formatter CBA) that

all run voltages are nominal. This signal

goes low if the run supply turns off. This

allows the light engine to perform

preshutdown house keeping functions.

The run supply is turn on via the On/Off

signal from the DM2CDR (via connector

J24605-13).

Fig. 17 AC In CBA Service Position

Fig. 16 AC In CBA

Standby & RunPower Supply CBA


22/38

Page 22

(2H, 2.14H)

J22105

OSD

Vert

Horz

2H Pr

2H Pb

2H Y

RecOut

1H CVFilter/BufferSD Video

TL851

D1_Out

GPIP

Buffers

HD VideoFilters &

Pr_OUT2

Pb_OUT2

C_OUT2

Y_VOUT2

Pr_OUT1

Pb_OUT1

C_OUT1

Y_VOUT1

J22104

DM2CR

NTSCPip Tuner

ATSC Tuner& NTSC Main

Tuner

FSW

DEINT_V

DEINT_H

DEINT_Pr

DEINT_Pb

DEINT_Y

PIP_CV

Main CV31

29

23

27

25

12

18

14

16

1

2

5

7

9

13

U23501

R-Out

L-Out

U11603Audio

AUD_L

SWITCH_R

SWITCH_L

AUD_R

4.5MHzBPF

VSBDecoder

1

3

5

7

J22104

To/FromA/V In

Out CBA

ToFormatterCBA

To/FromAV InOut CBA

DigitalVideo

VideoDecoder

9 Bit

U22500

ATSC

NTSC Audio

NTSC

SWITCH &SPLITTERAnt A

Ant B

ATSCAudio

256 QAMDecoder

DTVDecoder

(2)1394

FirewireInput

Fig. 18 DM2CR Module Block Diagram

DM2CRCR Module Overview

The DM2CR module has 2 RF inputs

labeled ANTENNA A and B. Antenna A

is input to a Tuner/IF module that

contains a tuner section and dual IF

section. The tuner is capable of

processing both digital and analog RFsignals (ATSC & NTSC) from either

terrestrial or cable sources. The tuner

is a single conversion, electronically

aligned tuner with improved cross-

modulation, UHF image rejection, and

local oscillator phase noise performance

over previous tuners. Performance is

tailored to handle the predicted signal

environment during transition to digital

terrestrial television (HDTV) service,

256QAM digital cable, as well as

providing cable ready NTSC

performance as specified by the FCC.

Antenna B input is the PIP tuner and is

NTSC only.

The DM2CR has 2 DTV Link connectors

which are a compressed digital videoinputs offering an IEEE-1394 type video

connection for consumer devices such

as satellite receivers, cable receivers,

and digital recorders that meet the

specifications for DTV Link. DTV Link is

better known as 1394 or FireWire for

digital televisions. Audio and video

information is carried on a single wire.


23/38

Page 23

Fig. 19 DM2CR Module

DM2CR

A/V In/Out C

Audio

DM2CR

The DM2CR module contains a GPIP

IC (U23501) and performs the following:

NTSC processing

ATSC decoding

Process YPrPb

Process S-Video

Decode Y+C

Adap ti ve combing of

composite video

Performs PIP function

Recover Teletext, closed

caption and Gemstar data

Digitize all 1H video inputs

Outputs digitized YPrPb

TL851 is an video decoder, display

processor with scan rate converter. For

1H video inputs, the output will be up-

converted to 2H 480p and the display

will be locked to the incoming video.

The TL851 recovers HDTV video signals

in YPbPr format from digital bit streams

output from the VSB (visidual side band)

decoder and processes them for display.

The HD output will be YPrPb, either

1080i, for HD inputs (1080i, 1080p, or

720p) or 1920x480p for SD (standard

definition) inputs. The TL851 also

generates the text and graphics for the

OSD (on-screen display). The TL851

outputs two types of video, Analog SD

video (2H NTSC), Analog ATSC video

(YPrPb) along with the appropriateaudio. The HD video output provided

to the chassis consists of YPrPb,

Horizontal and Vertical sync signals.


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Page 24

V-Sync

H-Sync

Y

Pr

Pb

Formatter CBA

Dual DC-DC3.3V/2.5V

Pwr_Good

+5VR

+12VR

+3.3VR

+2.5VR

BEP

A/D Lun-IC

FPGA

EEPROM

ChromaDRAM

Red

GreenBlue

H-Sync

V-Sync

V-Sync

H-Sync

FSW

Y

Pr

Pb

Red

Grn8

8

8

LumaDRAM

Vert

Tx0

Tx1

Tx2

TxC

A/D Clk

+9VR

Blue

DVIOutput

DigitalRGB

(720P)IW701

IV401

IW601

IW801DVITx

IW901

BV401

BV402

BW901

BW902

IW705/6/7IW702/3/4

BP503

2

4 5

7

9

3

12

12

14 16

18

23

2

6

89

10

1

2

1

5

3

8

7

2

2

2

2

48bit Vidto

24bit Vid720P

IW501

1 38 13

ToDLP

DriverCBA

ToDLP

DriverCBA

From AC In CBA

FromA/V In/Out

CBA

(Ext 2H &2.14H)

I2C_DAT

I2C_CLK

FromDM2CR

(2H)

InternalAnalog

ATSC &NTSC

(RUN 2)

(RUN 2)

Fig. 20 Formatter Block Diagram

Formatter Module Overview

The formatter circuit board is responsible

for converting the analog video from

either the DM2CR and analog inputs

from the A/V In/Out circuit board into a

format that is compatible with the light

engine. DC power for the formatter

circuit board as well as the light engine

is supplied by the main (run) power

supply located on the AC In CBA. These

supplies include +5VR, +12VR, +3.3VR

and +2.5VR. A Pwr_Good from the run

supply is routed through the formatter

CBA. This signal tells the light engine

that supplies are at nominal value. All

functions and circuits on the formattercircuit board are monitored and

controlled by the system control

microcomputer in the DM2CR. This is

accomplished via the RUN 2 I2C clock

and data bus. The same I2C bus is also

routed through the formatter board tothe light engine.

The 2H and 2.14H external inputs along

with sync are applied to connector

BV402. Next it is applied to the BEP

(back end processor) for processing

into an analog RGB signal. The NTSC

and the ATSC analog video signal (2H)

from the DM2CR is applied to connector

BV401. The video is also applied to

IV401 for conversion to RGB. The RGBoutput from IV401 is then applied to the

Analog to Digital (A/D) converter IW601.


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Page 25

Fig. 21 Formatter CBA Service Position

Its output is 8 bit digital red, green and

blue video data stream. This digital

video is next applied to the Lun-IC,

IW701. IW701 converts the threeseparate digital video streams to a 48

bit 720P digital RGB signal. This 48 bit

signal is then processed by the FPGA

IC IW801. The output from IW801 is a

24 bit 720P signal that the DVI

transmitter can use. The DVI transmitter

IW901 converts the 24 bit signal to the

DVI format. These outputs exit the

formatter circuit board via connector

BW901 and are sent to the light engines

DVI receiver. The DVI transmitter and

receiver incorporate HDCP (High

Bandwidth Digital Content Protection.The HDCP encryption format covers all

high bandwidth applications such as

computers, DVD players and HDTV

(ATSC). Whenever the connector

BW901 is disconnected the DVI

transmitter turns off. This is done to

protects against and prevents any video

pirating.


26/38

Page 26

Audio Switching Overview

The A/V In/Out circuit board is broken

down into its two (2) basic functions;

these are audio switching and video

switching. The audio switching circuitry

for the external audio inputs are located

on the A/V In/Out module. Source

selection for DVI audio and the analog

external audio inputs including FAV

audio jacks is provided by the audio

switching IC U26901. The audioswitching is controlled via the I2C RUN

1 bus from the DM2CR module. Also

the DM2CR module performs

demodulation of the audio from off-air

sources (NTSC and ATSC). These off

air baseband audio sources from the

DM2CR is routed through the A/V In/

Out circuit board to the Audio board for

final processing. The external audio

input jacks are located on the A/V In/

Out circuit board. L/R inputs include

audio from Aux1, Aux2, Aux3, Aux4

and DVI. The Front Audio Video (FAV)panel has one set of L/R audio jacks

that is applied to the switching IC

Fig. 22 Audio Switching Block Diagram

U26901

J26903

SEL_

AUD_

L

SWITCH_

R

59

61

J26901

SWITCH_

L

SEL_

AUD_

R

37

35

1

79

72

70

Aux R Audio (X4)

Aux L Audio (X4)

DVI_1 AUDR

DVI_1 AUDL

J26905

2

5

7

3

10

12

1357

A/V InputOutput CBA

FAV AUD IN R

FAV AUD IN L

FAV H-P L

FAV H-P R

AUD_L

AUD_R

To/From DM2CR

FAV Headphone R

FAV Headphone L

To/FromAudioCBA

J26904

4

2

6FromAC InCBA

+12VR

+5VR

+12VS

21 22

9

724

Aud/VidSwitch

42

43I2C_DAT

I2C_CLK

I2C_

DAT

I2C_

CLK

(RUN 1)

(RUN 1)

(RUN 1)

(RUN 1)


27/38

Page 27

Fig. 23 A/V In/Out CBA Service Position

U26901. The selected baseband audio

signal output from U26901 is looped

through the DM2CR module and back

to the A/V In/Out CBA where it then sent

to the audio processing circuit board.

The FAV Headphone L/R audio from

the Audio board is simply routed through

the A/V In/Out board to the FAV. When

the DVI audio input is selected it is

routed to the DM2CR for decoding into

analog audio and is then routed back

through the I/V In/Out CBA and on to

the Audio circuit board for final

processing. Power supplies for the A/V

In/Out board include the +12VR, +12VS

and +5Vr and is supplied by the AC In

CBA.


28/38

Page 28

Fig. 24 Audio Processing Block Diagram

AUDIO CBA

J11501

5

7

2

3

10

12

FAV_Headphone_R

FAV_Headphone_L

TRUSUR-ROUND

U11701

15 16

10

9

R_AUD

L_AUD

PA_R

PA_L

PowerAmp

SW11902

7

11

8 6

7

11

9

3

U11501

BUSEXPDR

3

411

12

13

15

FAV_SPKR_MUTE

SUB_CONT

TRUS

PA_MUTE

U11801AUDIO

TR

TL

MDL

MDR

CDR

CDL

VOL

EQU

BAL

42

43

1

44

41

40

20

19

26

28

CTL

AMP

U1155175

12

24

U11490

6

7

3

1

AudioOUT

7

1

U11460

3

5

R_OUT

L_OUT

R

L

U11702

7

13

5

AMP

LR

IntSpkr

ExtSpkr

CntrSpkr

SubWoofer

To/FromA/V InputOutputCBA

I2C_DAT

I2C_CLK

I2C_

DAT

I2C_

CLK

I2C

(RUN1

)

(RUN1

)

(RUN 1)

(RUN 1)

Audio Processing OverviewAll of the audio circuitry is located on

three assemblies. The audio switching

and the audio jacks are located on the

A/V In/Out CBA. The DM2CR module

performs demodulation of the audio

from off-air sources (NTSC and ATSC).

The Audio circuit board performs the

base-band audio processing such as

volume control, graphic equalizer,

subwoofer output, and power

amplification along with speaker

switching. The audio circuit board also

contains the SRS and Tru Surroundfeature processing circuitry.

The analog audio from the DM2CR is

routed back to the A/V IN/OUT board

where it is cabled to the Audio board.

There it is input to a differential amplifier,

U11551. This amp is used to eliminate

ground loops caused by the long cable

routing. The output of U11551 is fed to

the input of the SRS/FOCUS processing

blocks, U11701 & U11702, and directly

to one input of the audio processor,

U11801. The processor selects one ofthree inputs, the direct signal (no SRS)

from U11551, Regular SRS or

TruSurround from U11701 or SRS/

FOCUS from a combination of U11701

and U11702.

The analog input for the SRS/

TruSurround circuit is taken off the

output of the amplifier, U11551. These

produce two signals which are sent to

inputs on the audio processing IC,U11801, along with the direct signal.

The processor IC selects which input

signal is required for the customer-

selected mode. The first block,

composed of IC U11701, performs

either Regular SRS or TruSurround.

The second block, composed of IC

U11702 performs Focus mode.


29/38

Page 29

Fig. 25 Audio Processing CBA Service Position

Regular SRS mode is selected by using

the midpoint of the output of the SRS

block and placing it in Regular mode.

Focus is always on but its output isnt

selected. SRS Focus mode is

composed of Regular SRS plus Focus.

The SRS block is placed in Regular

mode and the Focus output is also

selected.

TruSurround mode is selected by

placing the SRS block in TruSurround

mode and using its output. The audio

processor (U11801) has three input

signals applied to the selector, direct

audio from U11551, SRS from U11701

and Focus from U11702. After the

signal is selected in the processor,

volume control is applied. The DLP

system does not have a separate tone

control function but a 7-band graphic

equalizer is available. After the

equalizer, L and R signals are summed

and split off to form two signal paths.

The summation stage output signals

are run through a highpass filter for the

main channels, and a matching lowpass

filter for the subwoofer. The subwoofer

volume is therefore controlled by themain volume, but a fader is provided in

the subwoofer path (accessed by the

Subwoofer Level menu) so that its

level may be adjusted relative to the

main channels. Three analog outputs

from the processor provide the Left,

Right, and subwoofer signals.

The PA_L and PA_R audio signals from

the audio processor are routed to three

circuit areas, first to U11460, which

drives the HiFi Output jacks located onthe Audio module, second to the main

power amplifier, U11901 and third to

the headphone amplifier, U11490.

The output of U11490 is routed through

the A/V IN/OUT module to the

headphone jack which is located on the

FAV module. The subwoofer output

from the processor is routed to

connector, J11801. The subwoofer

amplifier module plugs into thisconnector. Also present on the

connector are two control lines that

sense the presence of the subwoofer

option and turn the amplifier and power

supply off and on.

As mentioned previously the Audio

module also contains a bus

expander,11501, that is connected to

the system microcomputer inDM2CR

via the I2C bus. The bus expander onthe Audio Module uses its ports to select

the following functions, FAV Speaker

Mute, SubWoofer Control, SubWoofer

Detect and Power Amp Mute.


30/38

Page 30

49

5052

54

57

58

60

62

J26903

J26901

Switch1H Video

U26901

Pr_OUT2

Pb_OUT2

C_OUT2

Y_VOUT2

Pr_OUT1

Pb_OUT1

C_OUT1

Y_VOUT1

7168

30

32

28

23

8

6

2

75

Main CV31

29

23

27

25

12

18

14

16

ToDM2CR

(External 2H& 2.14H)

J28901

5

4

2

3

1

343335

Switch

Video2H

U28901

23

22

25

26

27HD_Y

HD_PB

HD_PR

HD_H

HD_V1

2

4

6

8ToFormatter

CBA

83

84

64

65

34Combed C

Combed Y

Sel. CVU16301

FAV C

FAV Y

FAV CV

Aux Pb (X2)

Aux Pr (X2)

Aux Y (X2)

Aux Y/C (X2)

Aux CV (X4)

5/6

U22201

J22201

A/V Input/Output CBA

19

18

31

26

23

DVI_VSYNCDVI_HSYNC

DVI_B

DVI_G

DVI_R

TXC(+/-)

DVI ReceiverDVI

Input48/49

RX2 (+/-)51/52

RX1(+/-)2/3

RX0(+/-)

1/2

9/10

17/18

23/24

Frame

Comb

93

30 31 15 14

42

43I C_Dat2

I C_Clk2

I C_Dat2I C_Clk2 I C_Dat2I C_Clk2

46

47

I C_Dat2

I C_Clk2

6

10

12

(RUN 1)

(RUN 1)

(RUN 1) (RUN 1)

(RUN 1)

Fig. 26 Video Switching Block Diagram

Video Switching OverviewThe A/V In/Out circuit board is broken

down into its two (2) basic functions,

video switching and audio switching.The A/V In/Out circuit board has external

input jacks that accepts four Composite

Video (CV), two S-Video, two

component video (YPrPb) and one DVI

digital video. The video inputs on the A/

V In/Out board can be either 1H NTSC,

2H NTSC or 2.14H NTSC. The Front A/

V (FAV) panel has one component video

input as well as a S-Video connector

which is routed through the A/V In/Out

CBA.

The A/V In/Out CBA also has a DVI

input. DVI (Digital Video Interface)

combined with HDCP (Hi-Bandwidth

Digital Copy Protection) creates a newuncompressed protected digital

interface (called DVI-HDTV) for hooking

an HD Monitor to a Video Source (for

example, a set-top box or DVD player).

This interface is not only uncompressed,

but it is also high speed (3.96 GB/s)

making it a perfect solution when the

best picture quality and minimal signal

loss are required.


31/38

Page 31

Fig. 27 A/V In/Out CBA Service Position

The DVI receiver IC U22201 decodes

the DVI video and then outputs RGB

with horizontal and vertical sync. Thissignal is then applied to U28901 for

switching and matrix conversion to

YPrPb. This YPrPb video is then routed

directly to the Formatter circuit board.

The switching for NTSC/1H sources

(composite, S-Video, and component)

is provided by IC U26901 for rear input

jacks and the FAV jacks. All video

switching ICs are monitored and

controlled via the I2

C bus.

A frame comb filter is provided to

optimally comb any composite source

into an S-Video (Y/C) output sourcewhich is routed back into U26901. All

composite and luma inputs to U26901

have sync detectors that are readable

via the I2C bus which allows for automatic

source detection. Source selection for

HD/2H/2.14H sources (component and

DVI) are provided for rear inputs (2

component and 1 DVI) with the IC

U28901. This IC is a 4-input video

switch with signal format detection.


32/38

Page 32

Service Tips1. Whenever the rear cover of the instrument is removed, the interlock safety

switch must be bypassed before the unit will operate correctly.

2. If light engine has entered cool down mode (30 sec timer), Power LED blinks

slowly 3 times if power on button is pressed. Unit will turn on after timer has

expired. See Lamp Startup/Shutdown Flowchart.

3. When AC is applied, instrument will not respond for 20 to 25 seconds. The DM1

module must boot-up and perform internal diagnostic.

4. The lamp cooling fan and the DLP device fan operates whenever the unit is turned

on. If failure in fan circuit occurs, unit starts up normally then shuts down or will

not start at all.

5. Before replacing light engine, always confirm picture quality issues by accessing

the test patterns in the service menu 80. All patterns accept the checker board

are generated by the formatter CBA. The checker board is generated by the light

engine.

Service Menus & Diagnostics

Service menus and diagnostics procedure are critical to effectively diagnose failures

and problems in the instrument. The following is a summary of the HDLP50W151

service menus.

Service Menu (V:76): Turn instrument on, then press and hold Channel Down &

Menu simultaneously. Next, select Service Alignment in menu, then volume Up to

V:76 then Channel Up and Down to desired adjustment. After selecting adjustment,Volume Up/Down changes value of adjustment. Press off to exit.

Test Patterns (V:80): Enter service menu and volume up to V:80. Channel up to

go to patterns. The skip button toggles the pattern and the menu button toggles

between the pattern and normal video. To exit, press the off button.

Usage Clock (V:90): Enter service menu and volume up to V:90. Channel up for

usage clock. Press off to exit.

Error Codes (V:50): Enter service menu and volume up to V:50. Channel up

for first failure code. Channel up for next of 8 failure codes. Pressing clear

removes error code. Last error is most recent failure code. I.E: if four (4) errors

are listed, four is the most recent. To exit, press the off button.

DM1 Warm Reset: Press and hold Channel Down & Power button simultaneously

for approximately 3 secs.


33/38

Page 33

DLP Service & Troubleshooting

Important: Before replacing any circuit boards, recover the Last Failure codeusing Chipper Check. Also, its very important when troubleshooting

to accurately identify the symptom in order to quickly isolate which

circuit board or item has failed. The Probable Causeslisted in theaccompanying procedures are in there most likely order, 1, 2, 3,

etc.

Symptom: Dead Set/No Start (No relay click/No Power LED when AC applied)

Probable Cause:

1. Main Power Supply Board

Standby voltages are used by the DM2CR and is obtained from the AC In

CBA. If the standby supply doesnt turn on when AC is applied, the relay willnot energize and the DM2CR doesnt have the supply it needs.

2. DM2CR Module

If the power supply is OK but the DM2CR doesnt respond to power on

commands then the DM2CR module has likely failed.

Symptom: No Picture, Audio OK

(relay click OK when AC applied, Power LED Flashes 4-5 times then stays on)

NOTE: The LED will only flash one time (4 to 5 flashes) and the unit must be resetby unplugging AC to get unit to flash again.

Probable Cause:

1. Lamp assembly

Obtain failure code with Chipper Check before replacing (or subbing) lamp

assembly. A flashing Power LED indicates a lamp or lamp power supply

failure and the lamp assembly is the most likely cause.

2. Lamp power supply

If the Power LED still flashes after replacing the lamp assembly, replace lamppower supply

3. AC In Power Supply Board

The source voltage for the lamp power supply is developed on AC IN CBA.


34/38

Page 34

Symptom:Pixelization, Digital Freezing &/or Digital Noise/Artifacts

Probable Cause:

1. Weak terrestrial (ATSC) signal

A weak ATSC terrestrial (check strength of terrestrial signal) signal can cause

pixelization or freezing. An external antenna can dramatically improve ATSC

reception.

2. Formatter CBA module

Apply 2H YPrPb to an external input. If pixelization is still present replace

Formatter CBA.

3. DM2CR Module

Always perform a Reset by removing and reapplying AC Power. If pixelization

not present with 2H YPrPb applied to external inputs, replace DM2CR.

4. Light Engine

Before replacing light engine, confirm picture quality issues by accessing the

test patterns in the service menu 80. All patterns accept the cross hatch aregenerated by the formatter CBA. The cross hatch is generated by the light

engine.

Symptom: Stuck pixels (Black and/or White)

Probable Cause:

1. Light Engine, before replacing light engine refer to service data (ESI) for DLP

defect tolerance specification.


35/38

Page 35

Symptom: Instrument starts normally then shuts down(runs 20-30secs)

Note:When unit shuts down, Power LED blinks three (3) times. Set restarts

automatically after 20-30 seconds. After 3rdcycle unit remains shutdown

(unplugging AC resets unit).

Probable Cause: 1. Failure of lamp cooling fan or DLP device cooling fan.

Symptom: Poor Picture Quality(spots, discoloration, color impurities, etc.)

Probable Cause:

1. Poor Signal Quality

Whenever dealing with picture quality issues, always check quality of signal

source before servicing unit.

2. Light Engine

Before replacing light engine, confirm picture quality issues by accessing the

test patterns in the service menu 80. All patterns accept the checker board

are generated by the formatter CBA. The checker board is generated by the

light engine.

Symptom: Rotated or Offset Picture

Probable Cause:

1. Perform mechanical rotation adjustment of light engine and/or use service menu

76 to adjust horizontal and vertical centering.


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