1

WARNING This service information is designed for experienced repair technicians only and is not designed for use by the general public. It does

not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product. Products

powered b electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service or repair the

product deal with in this service information by anyone else could result in serious injury or death.

COLOR TV

Model No. DX-LDVD22-10A

CHASSIS: ZORAN775

2009 (Qingdao Electronics limited company)

All rights reserved. Unauthorized copying and distribution is a violation of

law.

2

CONTENTS Table of contents………………..................………………….……….2 1. General Information…………...............…………………………..4

1.1 General Guidelines................................................................................4 1.2 Important notice…………………………………………………………..…4 1.3 How to read this Service Mauna…………………………………………..5

2. SPECIFICATIONS………………………………………………….…...7

3. LOCATION OF CONTROLS AND COMPONENTS…..…..9

3.1Board Location……………………………….. ………….……………..…..9

3.2 A Board----Main Board……….………………………..…………...……....9

3.3 B Board------- (Power Board)………………………..………….... ……..14

3.4 LCD Panel……………………………….. ………..………………………14

4. Disassemble and assemble…...………..…………………….....17

4.1 Tearing down the base…..……………….…….…………..………….….17

4.2 Tearing down the plastic front cabinet…………………………..….……17

4.3 Tearing down the panel…………………………………………..........…17

4.4 Tearing down the panel joint pieces………………………………..……18

4.5 Tearing down the main board…………..………………………...………19

4.6 Tearing down the power supply….………….………………….…….….19

4.7 Tearing down the DVD….……………………….…………..………....…20

4.8 Tearing down the speaker……………………….....................…………20

4.9 Tearing down the DVD keypad assembly………………………….……21

4.10 Tearing down the rotated axis.……………………………………….…21

4.11 Tearing down the terminal board…………………………….....………22

4.12 Tearing down the keypad and remote control board…………………22

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5. INSTALLATION INSTRUCTIONS…………………………...….24

6. OPERATION INSTRUCTIONS……………………………….…..27

6.1 Front Panel Controls…………………………………………..................27

6.2 Back Panel Controls………………………………………….……….......28

6.3 Setting up Your Remote Control…………..……………………………..29

7. MEASUREMENTS AND ADJUSTMENTS…………………..30

8. Electrical parts……………………………...…………………………..35

8.1 Wiring Connection Diagram…………………..……………………..……35

8.2 Block Diagram…….………………………………..……….…………......36

8.3 Circuit Diagram……………………………….........................................36

9. Trouble Shooting Guide …………………………………………..54

4

1. General Information 1.1 General Guidelines When servicing, observe the original lead dress. If a short circuit is found, replace all parts which have been overheated or damaged by the short circuit. After servicing, see to it that all the protective devices such as insulation barriers, insulation papers shields are properly installed. After servicing, make the following leakage current checks to prevent the customer from being exposed to shock hazards.

1) Leakage Current Cold Check 2) Leakage Current Hot Check 3) Prevention of Electro Static Discharge (ESD) to Electrostatically Sensitive

1.2 Important notice 1.2.1 Follow the regulations and warnings Most important thing is to list up the potential hazard or risk for the service personnel to open the units and disassemble the units. For example, we need to describe properly how to avoid the possibility to get electrical shock from the live power supply or charged electrical parts (even the power is off).

This symbol indicates that high voltage is present inside. It is dangerous to make any king of contact with any inside part of this product. This symbol indicates that there are important operating and maintenance instructions in the literture accompanying the appliance

1.2.2 Be careful to the electrical shock To prevent damage which might result in electric shock or fire, do not expose this TV set to rain or excessive moisture. This TV must not be exposed to dripping or splashing water, and objects

Filled with liquid, such as vases, must not be place on top of or above the TV 1.2.3 Electro static discharge (ESD) Some semiconductor (solid state) devices can be damaged easily by static electricity. Such Components commonly are called Electrostatically Sensitive (ES) Devices. The following tech-niquesshouldbeusedtohelpreducetheincidenceofcomponentdamagecausedbyelectro Static discharge (ESD). 1.2.4 About lead free solder (PbF) This product is manufactured using lead-free solder as a part of a movement within the consum-er products industry at large to be environmentally responsible. Lead-free solder must be used in the servicing and repair of this product. 1.2.5 Use the genewing parts (specified parts) Special parts which have purposes of fire retardant (resistors),high-quality sound (capacitors), low noise(resistors), etc. are used. When replacing any of components, be sure to use only manufacture's specified parts shown in the parts list.

Safety Component ● Components identified by mark have special characteristics important for safety.

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1.2.6 Take Care to Deal With The Cathode-Ray Tube

In the condition that an explosion-proof cathoderay tube is set in this equipment, safety is se-cured

against implosion. However, when removing it or serving from backward, it is dangerous to give a

shock. Take enough care to deal with it.

1.2.7 Safety Check after Repairment Confirm that the screws ,parts and wiring which were removed in order to service are put in the

original positions, or whether there are the portions which are deteriorated around the serviced

places serviced or not. Check the insulation between the antenna terminal or external metal and

the AC cord plug blades. And be sure the safety of that.

Insuration Test 1. Unplug the plug from the AC outlet.

2. Remove the antenna terminal on TV and turn on the TV. 3. Insulation resistance between the cord plug terminals and the eternal exposure metal

should be more than M ohm by using the 500V insulation resistance meter

4. If the insulation resistance is less than M ohm, the inspection repair should be required. If you have not the 500V insulation resistance meter, use a Tester. External exposure metal: Antenna terminal Headphone jack

1.2.8 Ordering Spare Parts Please include the following informations when you order parts. (Particularly the Version letter) 1. Model number and Version letter

The model number can be found on the back of each product and the Version letter can be found at the end of the serial number.

2. Part No. and Description You can find them in your service manual.

1.2.9 Photo used in this manual The illustration and photos used in this Manual may not base on the final design of products, which may differ from your products in some way.

1.3 How to read this Service Manual 1.3.1 Using Icons Icons are used to attract the attention of the reader to specific information. The meaning of each icon is

described in the table below:

Note: A “note” provides information that is not indispensable, but may nevertheless be valuable to the reader, such as tips and tricks.

Caution: A “caution” is used when there is danger that the reader, through incorrect manipulation,

6

may damage equipment, loose data, get an unexpected result or has to restart(part of) a procedure.

Warning: A “warning” is used when there is danger of personal injury.

Reference:

A “reference” guides the reader to other places in this binder or in this manual, where he/she will find additional information on a specific topic.

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2. Specification Screen Size 21.6" Display Type LCD

Panel Technology TN Panel 60 Hz vs.120 Hz 60Hz

Display Resolution 720p Panel Resolution (Min.) 1366(H)x768(V)

Backlight Technology (CCFL or LED) CCFL Aspect Ratio 16:9

Contrast Ratio (Typ.) - panel 800:1 Brightness (Center Typ.) cd/m2 350 Panel Native Color Temperature 6500

Uniformity (9-point Min.) 0.76(5POINT) Response Time - Fact Tag 5ms

Panel Bit Depth (6 bit with FRC or 8 bit) 6 bit Lamp Life (Typ. Hours) 50000

Horizontal Viewing Angle (At CR>10) 170 Vertical Viewing Angle (AT CR>10) 160

ATSC Tuner with Clear QAM Yes NTSC Tuner (air & cable) Yes

Tuner Module Provider & part # NXP Zoom/Display Formats (Min.) Yes (3)

Comb Filter 3d y/c digital 3-2 Pulldown Yes

USB Port for thumb drive (side) - Supports F/W Upgrade, MP3, JPEG Yes(For firmware update, back side, with cover)

Closed Captioning Display Yes V-Chip (Version 2.0) Yes

Sleep Timer Yes Channel Labeling Yes

Auto Zoom Yes Composite Inputs (back) Yes (1) (SIDE BACK)

S-Video Inputs (back) Yes (1) (SIDE BACK) Component Video Inputs (back) Yes (1) (SIDE BACK) HDMI Input - HDMI 1.3 (back) Yes (1) (SIDE BACK)

PC Input - VGA (back) Yes (SIDE BACK) Shared Audio Inputs Yes (COMPOSITE & S-VIDEO)

RF Input (back) Yes (SIDE BACK) Earphone Jack Location (side or back) side (1) (SIDE BACK)

Watts/Channel (Min at 10% THD) 3W x 2 Sound Leveler Yes

Audio-only (panel off) Yes MTS/SAP Yes

Mono or Stereo Speaker Stereo IR/RF IR

8

Power Light On-Green; Off-red Power: AC 120volt/60Hz Yes

DVD Player Yes

Optical Disk Playback Support DVD Video/-R/-RW/+R/+RW/CD-R/-RW/JPEG

Photo DVD video interface to TV Component - Progressive

PC Input Max, Resolution (match panel) 1360*768 OSD Style Simple-standardized

OSD Languages (Eng/Fre/Spa/Mand) Eng/Fre/Spa Multi-Lingual Manuals (combined or divided) Combined

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3. LOCATION OF CONTROLS AND COMPONENTS 3.1. Board Location

No. Description A Board Main Board B Board Power supply Board C DVD D Speaker

3.2. A Board----Main Board

3.2. 1 Function Description:

Main Board：

A Board

D

B Board C DVD

10

Process signal which incept from exterior equipment，then translate into signal that panel can display.

3.2.2 Connector definition

Main board connector

LVDS Connector (CN8)

PIN 1

11

Power supply and Inverter Connector（CN3）

Pin number Signal name Description 1 NC NC 2 NC NC 3 NC NC 4 NC NC 5 LVDS_D0E_N LVDS EVEN 0 - Signal 6 LVDS_D0E_P LVDS EVEN 0 + Signal 7 GND Ground 8 LVDS_D1E_N LVDS EVEN 1 - Signal 9 LVDS_D1E_P LVDS EVEN 1 + Signal

10 GND Ground 11 LVDS_D2E_N LVDS EVEN 2 - Signal 12 LVDS_D2E_P LVDS EVEN 2 + Signal 13 GND Ground 14 LVDS_CE_N LVDS EVEN Clock - Signal 15 LVDS_CE_P LVDS EVEN Clock + Signal 16 GND Ground 17 LVDS_D3E_N LVDS EVEN 3 - Signal 18 LVDS_D3E_P LVDS EVEN 3 + Signal 19 GND Ground 20 NC NC 21 NC NC 22 NC NC 23 GND Ground 24 GND Ground 25 GND Ground 26 Panel_power Power for panel 27 Panel_power Power for panel 28 Panel_power Power for panel 29 Panel_power Power for panel 30 Panel_power Power for panel

PIN 1

12

Pin number Signal name Description 1 ON/OFF Preparative switch control

2 GND Ground 3 GND Ground

4 ADJ INVERTER Lightness Adjust

5 BLON INVERTER Switch Control

6 +12V 12V Power

7 +12V 12V Power

Audio Output Connector（CN1）

Pin

number Signal name Description 1 LSPK Left Audio Output 2 GND Ground 3 GND Ground

4 RSPK Right Audio Output

Remote Board and Key board Connector（CN2）

Pin number Signal name Description 1 IR_IN IR

2 CPU5V 5V Power 3 LED_B Blue Indicator light

4 GND Ground 5 LED_R Red Indicator light

6 K6 Key Connector POWER 7 K5 Key Connector MENU 8 K4 Key Connector P- 9 K3 Key Connector P+ 10 K2 Key Connector V-

PIN 1

PIN 1

13

11 K1 Key Connector V+ 12 K0 Key Connector SOURCE

DVD Power Connector (CN5)

Pin number Signal name Description

1 STB stand by 2 5V 5V Power 3 GND Ground 4 GND Ground 5 12V 12V Power

DVD Video Connector (CN6)

Pin number Signal name Description

1 DVD_SW DVD自动跳转 2 DVD_PB Pb Signal 3 DVD_Y Y Signal 4 GND Ground 5 DVD_PR Pr Signal 6 GND Ground 7 DVD_IR IR control

DVD Audio Connector (P1)

Pin

number Signal name Description 1 DVD_L_IN Left track 2 DVD_R_IN Right track 3 GND Ground

PIN 1

PIN 1

PIN 1

14

3.3.B Board------- (Power Board) Supply power for Main board and Panel

Power supply and Inverter Connector（CN10）

Pin number Signal name Description 1 NC

2 GND Ground

3 GND Ground

4 BL-ADJUST INVERTER Lightness Adjust

5 BL-ON/OFF INVERTER Switch Control

6 +12V 12V Power

7 +12V 12V Power Other Connector AC150V~AC240V Input (CN15) Power supply for panel (CN11) Power supply for panel (CN12) Power supply for panel (CN13) Power supply for panel (CN14)

3.4. LCD PANEL.

15

Connector definition

16

17

4. Disassemble and assemble

4.1 Tearing down the base

4.2 Tearing down the plastic front cabinet

4.3.1 Tearing down the panel

18

4.3.2 Tearing down the panel

4.4 Tearing down the panel joint pieces

19

4.5 Tearing down the main board

4.6 Tearing down the power supply

20

4.7 Tearing down the DVD

4.8 Tearing down the speaker

21

4.9 Tearing down the DVD keypad assembly

4.10 Tearing down the rotated axis

22

4.11 Tearing down the terminal board

4.12 Tearing down the keypad and remote control board

23

24

5. INSTALLATION INSTRUCTIONS Accessories

Remote Control User Manual Battery

25

26

27

6. OPERATION INSTRUCTIONS Basal information

6.1 Front panel controls

28

6.2 Back panel controls

29

6.3 Setting up Your Remote Control

30

7. MEASUREMENTS AND ADJUSTMENTS The way to the factory mode menu: First: press menu, Second: choose the AUDIO, Third: input 8893. Finished these operations, system will be into the factory mode menu. Press to select articles, and then press the Right or enter button to sub-menu.

Software Upgrade

White Balance/Color Temp

31

Picture Mode Setting

Audio Mode Setting

32

SSPLL Setting

IF you want to exit this factory menu, please press the button” Exit” in the remoter.

7.1 Picture

33

7.2 Audio

34

7.3 CHANNELS

7.4 SETTINGS

Quantity

Spec

Serial NO.

NAME

NO.

TUNER

DVD

2

4

6

7

8

9

10

1112

13

POWER

DVD Keypad

Auto-inserted Board

Assembly

Remote Control

Board Assembly

Keypad Assembly

14

1

CN2

CN7

CN22

CN10

CN15

CN11

CN1

CON1

CN4

321.6" LCD

PANNEL5

1DVD Audio And

Video Wire

2 3

DVD Power wire

4

DVD

Main board

5LCD Panel

6Power Supply

Board

7 8

FFC Wire

Speaker

Connection Wire

9Speaker

10 11

Connection Wire

For Contr

ol Board

12

Remote Control

Board Assembly

13

Keypad Assembly

Power Cord

14DVD Keypad

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37

9. TROUBLE SHOOTING GUIDE 9.1. Simple check

No Picture, no sound

Verify if the television is properly plugged Verify if the television is properly supplied power Verify if electricity is available

Blank screen

Verify if correct signals are input Press INPUT button to change signal input to TV input Restart the television of power supply is interrupted

No sound

Press Mute button and verify if Mute mode is set. Switch to other channel and verify if the same problem happens. Press VOL+ button to see of he problem can be solved.

Poor sound Verify if sound system is correct .Refer to some chapter for adjust.

No picture in some channel

Verify if correct channel is selected. Adjust the antenna. Make adjustments by Fine Tune and MANUAL Scan.

No color for some channel program(black and white)

Verify if the same problem exists in other channels. check out of picture and sound system. Refer to relative instructions in the Manual for color adjusts.

Spots with some or all pictures Verify if the antennal is correctly connected. Verify if the antennal is in good condition. Make fine adjustment of channel.

Horizontal/vertical bars or picture shaking

Check for local interference such as an electrical appliance or power tool.

Television out of control

Disconnect the television from power supply and 10 seconds later, connect the television to the power supply. If the problem still exists, contact authorized after-sales service for technical assistance.

9.2 Power Supply Board failure check

38

9.3 Main board failure check

State: No power First, check cables which connect with PSU, then check as follows 1) Check PSB input voltage（AC input） voltage : ～120V Connector: CN13 2）Check PSB output voltage orderly： Voltage: +12V, +12V Connector: CN10

39

State：No picture

40

9.4 Panel failure

Failure Mode

41

Part Name Description Phenomena Failure cause

V B/D Vertical bar

V Dim Vertal gray

line

V L/D

Vertical color

line(light or

dark forever)

H B/D Horizontal

bar

H Dim Horizontal

gary line

TCP

H L/D

Horizontal

line(light or

dark forever)

Block Defect :TCP cracking or cracking

Dim or L/D :TCP Sunken

:TCP lead cracking

:ACF bonding short

:Awful environment and something electric enter into

LCD

:Mis-align between TCP and Panel

:Panel failure

:TCP failure

Failure Mode

Part Name Description Phenomena Failure cause

Dot Defect Bright dot dark

dot in panel

Incoming Inspection Standard

Polarizer

Bubble

Bladder in

Polarizer

Bladder between Polarizer and top glass

Polarizer

Scratch Polarizer Scratch

Tine or rigidity arose

Panel or Polarizer

F/M inside

Polarizer

Eye winker inside

Polarizer

Eye winker inside Polarizer

Abnormal

Display Abnormal Display

Circuit

Flashing Bright and dark

display alternately

1. Chip lose action 2. IC ahort or jointiog bad 3. Pannel and vsc connect bad

42

Failure Mode

Part Name Description Phenomena Failure cause

White

Screen

B/L normal, only

white screen

display

Black

Screen

B/L normal, only

Black screen

display

Maybe caused by surge current and EDS

FIIcker Crosstalk

LCD Vcom imbalance

Abnormal

Color

Only color

abormal

Capacitance improper bring crosstalk inside LCD

panel

Circuit

Abnormal

Color

Only color

abnormal

1. Chip lose action 2. IC short or jointion bad 3. Pannel and vsc connect bad

Failure Mode

Part Name Description Phenomena Failure cause

Mechanlcal

Nolse

When turn

panel,appear

cacophony

Caused by Mechanica noise of backlight unit

Ripple Connectric circle

Causeed by between mechanism and pannel

B/L off B/L lose action *Connect badness between wire and electrode

B/L dark B/L brightness

darker than normal

*Connect badness Short between wire and electrode

B/L wire

damaged B/L wire damaged Operation abnormal or systemic noise

43

B/L wire

open Without backlight Operation abnormal or systemic noise

B/L shut

down

B/L shutdown in

sometime

Short bitween lamp housing and wire, Because

consume power too much

F/M

F/M in

B/L ,white,balck

Rotundity or

wirelike

F/M in B/L unit

Failure Mode

Part Name Description Phenomena Failure cause

Light leakage

Brightness at bottom of LCM brighter than normal

B/L unit badness

Uniformity B/L brightness asymmetric

Sheet in B/L unit is uneven Mechanlcal or B/L

Mount holeLack screw or screw damage

*Lack screw Screw damage