cr14300-cr20300-cr20301-cr29411

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1 - GENERAL SPECIFICATIONS

1.1 Product Models:

CR14300/20300...................................................................MONO conventional model;

CR20310..................................................................................................STEREO SAP;

CR29411..................................................................................................STEREO SAP.

1.2 Power Supply:

a) Power Source Range.........................................................................99VAC to 242VAC.

b) Power Supply: automatic commutation.

c) Power Consumption:

Model CR14300......................................................................................................60W;

Model CR20300......................................................................................................72W;

Model CR20310......................................................................................................80W;

Model CR29411....................................................................................................130W;

STAND BY..................................................................2W (120VAC) and 3W (220VAC).

d) High Voltage (Fly back Anode Voltage) and beam current:

High Voltage: CR14300/20300....................................................................22 1.5 KV;

Beam current - with brightness and contrast at the maximum...................0.7 + 0.1 mA;

CR20310...............................................................................23 + 1.5 KV;

Beam current - with brightness and contrast at the maximum...................0.9 + 0.1 mA; CR29411............................................................................27.5 + 1.5 KV;

Beam current - with brightness and contrast at the maximum...................1.4 + 0.1 mA;

e) Heating:..............................................................................................6.15 + 0.15 Vrms.

f) FLY BACK Main Power Supply :

Fly back Output Voltage CR14300.....................105 2 V DC; max ripple 2 Vpp; Fly back Output Voltage CR20300 e CR20310....108.5 2V DC; max ripple 2 Vpp;

Fly back Output Voltage CR29411..................130 2V DC.; max ripple 2 Vpp.

1.3 Tuner and Receiving channel:

Channel Coverage............................. 181 channels VHF/UHF/cable.

Color System: .........................................................PAL-N , PAL-M and NTSC;

1.4 Video Signal - Resolut ion:

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1.6 Carrier System:

Audio...................................................................................................................4.5Mhz;

PAL-M Chrome........................................................................................3,575.611Mhz; NTSC Chrome..........................................................................................3,579.545Mhz;

PAL-N Chrome.........................................................................................3,582.056Mhz.

1.7 Speaker Output :

CR14300/20300....................................................................2.5W rms;

CR20310...................................................................2.5W + 2.5W rms;

CR29411.........................................................................5W + 5W rms.

1.8 Antenna Input Impedance:

VHF/UHF/CABLE................................................75 unbalanced (F type connector).

1.9 Terminals:

Rear and front audio (mono) and video input ..................................CR14300/20300;

Rear and front audio (stereo) and video input .....................

..........................CR20310; Two rear and one front audio (stereo) and video input...................................CR29411; Input minimum impedance....................................................................10kOhms;

Audio input signal level................................................................400 to 800mVrms;

Video input signal level.....................................................................................1Vpp.

Rear Audio output .. ....................................CR29411 and CR20310;

Output maximum impedance......................................................................1kOhms;

Variable output level (maximum volume)....................................................1.5Vrms;

1.10 Dimensions (WxDxH):

CR14300...........................................................................................358.5x383x349 mm;

CR20300..............................................................................................486x488x446 mm;

CR20310..............................................................................................486x488x446 mm;

CR29411..............................................................................................754x529x578 mm.

1.11 Weight:

CR14300................................................................................................................8.9kg; CR20300..............................................................................................................17.1kg;

CR20310..............................................................................................................17.2kg;

CR29411..............................................................................................................34.3Kg.

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2. DISASSEMBLY INSTRUCTIONS

Removal of mechanical parts and P.C. boards.

2.1 Back cabinet (refer to fig. 2.1)

a. Remove the screws which are used for holding the back cabinet to the front cabinet (6screws for 14 models, 8 screws for 20 and 29 models).

b. Remove the screws which are used for holding the rear A/V input and output connectors.c. Remove the back cabinet.

2.2 CRT PCB (refer to fig. 2.2/2.3)

CAUTION: Before removing the anode cap, discharge electricity because it contains highvoltage. Before attempting to remove or repair any PCB, unplug the power cord from the ACsource.

a. Remove the anode cap.b. Disconnect the ground connector (CM801).c. Remove the CRT PC board.

2.3 Main PCB (refer to fig. 2.2/2.3)

a. Disconnect the following connectors: CM901, CM902, CM701, CM601, CM401 andCM402b. Unlock the PCB from the cabinet (both side of the board).c. Remove the main PCB.

2.4 CRT (refer to fig. 2.4)

a. Remove the 4 screws.b. Remove the CRT.

Note: REMOVAL OF ANODE CAP After turning the power off there might still be apotential voltage that is very dangerous. When removing the ANODE CAP, make sure todischarge the anode caps potential voltage. Do not use pliers to loosen or tighten theanode cap terminal, this may cause the spring to be damaged.

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3. ON-SCREEN DISPLAY ADJUSTMENT SERVICE MODE

3.1 Memory Initialization

If a service repair is undertaken where it has been required to change the MEMORY IC (IC101 andIC102) the following steps should be taken to ensure correct data settings: " memory initialization":

Unplug the power cord from the AC Power Source;

While holding down MENU button and VOLUME button (front panel), plug the power cord inthe AC Power Source (wait 2 seconds before release the buttons).

Turn on the TV set through front panel POWER button or remote control. To certify that the initialization was success executed, it will appear the following message:

ILLUSTRATION 1

3.2 OSD Adjustment Service Mode

Unplug the power cord from the AC source;

While holding down MENU button (front panel), plug the power cord in the AC Source (wait 2seconds before release the button);

Press and hold the MENU and VOLUME + buttons (front panel) during 2 seconds;

Turn on the TV set using POWER button (front panel or remote control unit).

Press MENU button to display the first SERVICE MENU. Press VOLUME + and VOLUME buttons for navigation menus in service mode;

Press CHANNEL + and CHANNEL buttons to select one service menu item; Press MENU button to activate the item adjustment. Press VOLUME + or VOLUME- to set the

value adjustment;

Press MENU button to return to the previous SERVICE MENU (for another selection).

To exit the service mode, press MENU button and turn off the TV set.

To Run AutomaticTuning Now

Plug the Antenna

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3.3 Service Menu Items:

HP= Horizontal Parallelogram RGB = OSDBrightHB = Horizontal Bowl SBL= Services BlankingHSH = Horizontal Shift Adjust FFI = IF FilterVS = Vertical Slope MAT = Color Matrix

VA = Vertical Amplitud BKS = Black StretchSC = Vertical S-Correction EVG = Vertical GuardVSH = Vertical Shift FMWS = Sound PLLBLR = Red Black Level Offset SL =Audio levelAdjustBLG = Green Black Level Offset ADJ = Stereo Adjust

WR = White Point (red) A1 = WidebandWG = White Point (green) A2 = Spectral

WB = White Point (blue) TC = ST current AdjustYn = Y Delay for NTSC FETRACK = RF Phase1 TimeYp = Y Delay for PAL AVTRACK =AV Phase1 TimeYav = Y Delay for Avin MODEL = Model IdentificationFSL V ti l S Sli i L l BLKCURR G2 Adj t

SERVICE

HPHBHSH

VSVA

SERVICE

SCVSHBLR

BLGWR

SERVICE

WGWBYn

YpYav

SERVICE

FSLCLAGCT

AGCSRGB

SERVICE

ORIGMAG

VO.3P

SERVICE

TCFETRACKAVTRACKMODELBLKCURR

SERVICE

FMWSSLADJA1A2

SERVICE

SBLFFIMATBKSEVG

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3.4AGC Adjustment

Apply a color bar pattern (RF Input) with 500V signal;

Connect a DC Voltmeter, in the AGC pin of the tuner;

AdjustAGCT to Zero and measure the voltage (V1);

AdjustAGCT so that the indication on the voltmeter be (V1) - 1 0.2V.

3.5Stereo Adjustment

For the adjustments, proceed according to illustration 2;

Adjust output indicated by A to tension equal to half of VCC plus 1V ;

Adjust TC to an indication in the microAmpre meter of 24A in the pin 17 of IC450;

Apply 300Hz/Mono/25KHz of deviation, 250mVrms, in the pin 29 of IC450;

Adjust SL to 50020mVrms in the pins 15 and 38 of IC450;

Apply in the channel L=300Hz and in the channel R= 3k, 14% of generator Stereo modulationDBX-NR (EIDEN BTSC );

ChangeADJ from 0 to 1. CheckA1 andA2 after 1 second (if they varied);

After 1 second returnsADJ to 0 . The stereo circuit will align automatically.

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Activate the adjustment mode display (SBL item). Ajust SBL from 0 to 1. Blanking the bottom ofthe screen.

Adjust VSH until the bottom of the pattern be aligned with the reference marks of the mechanicalcenter on picture tube (the central vertical line in the center of the tube).

Adjust VS until the central line be aligned with the half bottom of the screen (the central line of thecircle pattern in the half cut of the screen)

Return SBL from 1 to 0 value . The image could be compressed or expanded.

Select VA item and set its value to adjust the size of the picture (proportional height and width

picture).

If necessary readjust SC item and set its value to adjust the Linearity (acts in the top of the image)and VA.

NOTE: The SC and VA adjustments are interdependent (they should be used together).When the image to be decentralized in the vertical, to retouch VSH and/orVS

3.7 Horizontal Adjustment

Apply a Circle Pattern Philips (RF Input)

Using the remote control, set the MAGIC mode ORIGINAL

Activate the adjustment mode display (HSH item). Select HSH item and set its value to adjust the

horizontal symmetry of the pattern;

Select HP and HB items and adjust its value if necessary.

3.8 MAGIC Adjustment

Adjustment of original magic should have been according to pattern

Receive the color bar pattern (NTSC signal, RF input)

Connect the oscilloscope probe to the collector of Q830 (cathode G)

Using the remote control, set the image controls as follow:

Brightness: adjust to central position (8 Bars)

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Press VOLUME + button and change the value from 0 to 1. Turn off the television and the

ORIGINAL MAGIC setup will be registered.

3.9 SCREEN ( G2 ) Adjustment

Apply a Circle Pattern Philips at the antenna terminal (RF Input).

Using the remote control, set the brightness control to 10 Bars of the bargraph.

Activate the service mode and select BLKCURR item (the menu value should be 0)

Turn the Screen Grid Potentiometer (fly back body) fully counterclockwise (minimum adjustment).

Press the VOLUME + button . The register will change to 1 and vertical Deflection will beblanked.

Turn the Screen Grid Potentiometer slowly clockwise until the power led (stand by) turn on (if theadjustment of the screen Grid Potentiometer is turned beyond the ideal point, the power led will beturn off)

Press the VOLUME + button, it should return the original BLKCURR value. The image will bereturn and the adjustment is finished.

3.10 FOCUS Adjustment

Apply a Circle Pattern Philips at the antenna terminal (RF Input).

Using the remote control, set the Magic mode ORIGINAL

Turn the Focus volume (fly back body) fully counterclockwise once

Adjust the Focus volume until picture is distinct (center of the screen).

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4 REMOTE CONTROL

Models CR14300/20300/20310

NOTE: Consult the original r. c. manufacturer documentation to access the schematicdiagram and the replacement parts list.

The MENU button contains the followingoperations:

MAIN MENU

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4 REMOTE CONTROL

Model CR29411

NOTE: Consult the original r. c. manufacturer documentation to access the schematicdiagram and the replacement parts list.

The MENU button contains the followingoperations:

MAIN MENU

PICTURE >SOUND >CHANNEL

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5.2 BLOCK DIAGRAM OF IC-101 TDA9380

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5.3 BLOCK DIAGRAM OF IC-490 (BU4052)

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5.4 BLOCK DIAGRAM OF IC-601 (VERTICAL DEFLECTION BOOSTER)TDA9309/TDA8177F

5.5 BLOCK DIAGRAM OF IC-401 (STEREO AMPLIFIER) TDA7499

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5.6 BLOCK DIAGRAM OF IC-450 (STEREO DECODER)

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5.7 BLOCK DIAGRAM OF IC-430 LMC568 PLL- SAP

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6 DESCRIPTION OF THE FUNCTIONS THE INTEGRATED CIRCUITS PINS

6.1 IC101 (TDA9380)

SIGN PIN DESCRIPTION

OPEN 1 N/CSCL 2 SERIAL CLOCK OUTPUTDAS 3 SERIAL DATA OUTPUTGAME 4 GAME (PWM)SWITCHES A 5 SWITCHES OF THE FRONT PANEL (IN)SWITCHES B 6 SWITCHES OF THE FRONT PANEL AND LED INDICATION (IN)VSH DET 7 SVHS DETECTING (IN)

DET SAP 8 SAP DETECTING (IN)GND 9 TERRASW 0 10 COMMUTATION TO EXTERNAL AVSW 1 11 COMMUTATION TO EXTERNAL AVGND A 12 GROUNDSEC PLL 13 PLL DECOUPLING (SECAM)VP 2 14 SUPPLY 2DEC D05 15 DECOUPLING OF THE DIGITAL PROCESSOR

PH2IF 16 FILTER 2PH1IF 17 FILTER OF SYNCHRONISMGND 3 18 GROUND 3DET BG 19 FILTER OF (BANDGAP)AVL EWD 20 AVC FILTERVDR B 21 TO VERTICAL OUTPUT BVDR A 22 TO VERTICAL OUTPUT AIF IN 1 23 IF SIGNAL INPUT FILTER S.A.WIF IN 2 24 IF SIGNAL INPUT FILTER S.A.W

L REF 25 CURRENT INPUT REF. V. DRIVEVC CAP 26 DECOUPLING OF VERTICALAGC 27 FILTER OF AGCDEEM/SIFIN1 28 SIF 1 INPUTSDEC SIF 2 29 DECOUPLING OF UDIO (IN 2)GND2 30 GROUND 2SNDPLL SIF AGC 31 FILTER OF AGC AND SIFAVL REF 32 N/CHOUT 33 OUTPUT OF HORIZONTAL OSC. 15750HZSAND 34 H PULSE SAND CASTLEALDEXT OSS AM 35 EXTERNAL AUDIO INPUT IN THE MOD CR14300/20300 IN THE

OTHERS: N/CEHT PROT 36 PROTECTIONPLLIF 37 PLL IF FILTERVIDEOOUT 38 VIDEO OUTPUT

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BCORR/VGUARD 49 ABLBLYIN 50 BEAM CURRENTR 51 RED R

G 52 GREEN GB 53 BLUE BVDD A 54 SUPPLYVPE 55 GROUNDVDD C 56 SUPPLYOSDGND 57 GND OF OSC 12MHZXIN 58 CRISTAL OF 12MHZ

XOUT 59 CRISTAL OF 12MHZRESET 60 RESET CIRCUIT

VDD P 61 SUPPLY 33VMUDO 62 MUTE

PW ON 63 POWERIR 64 IR INPUT

6.2 - IC 901 (TDA16846)


OTC 1 OFF TIME CIRCUITPCS 2 PRIMARY CURRENT SIMULATIONRZI 3 REGULATION AND ZERO CROSSING INPUTSRC 4 SOFT-STAR AND REGULATION CAPACITOROCI 5 OPTO COUPLER INPUTFC2 6 FAULT COMPARATOR 2 (GND)SYN 7 SYNCHRONIZATION INPUT

NC 8 NOT CONNECTEDREF 9 REFERENCE VOLTAGE AND CURRENTFC1 10 FAULT COMPARATOR 1 (GND)PVC 11 PRIMARY VOLTAGE CHECKGND 12 GROUNDOUT 13 OUTPUT ( PWM PULSE)VCC 14 SUPPLY VOLTAGE

6.3 - IC 450 (TDA9855)


TL 1 TREBLE CONTROL CAPACITOR, LEFT CHANNELB1L 2 BASS CONTROL CAPACITOR, LEFT CHANNELB2L 3 BASS CONTROL CAPACITOR, LEFT CHANNEL

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TW 16 CAPACITOR TIMING WIDEBAND FOR DBXTS 17 CAPACITOR TIMING SPECTRAL FOR DBXCW 18 CAPACITOR WIDEBAND FOR DBX

CS 19 CAPACITOR SPECTRAL FOR DBXVEO 20 VARIABLE EMPHASIS OUTPUT FOR DBXVEI 21 VARIABLE EMPHASIS INPUT FOR DBXCNR 22 CAPACITOR NOISE REDUCTION FOR DBXCM 23 CAPACITOR MUTE FOR SAPCDEC 24 CAPACITOR DC-DECOUPLING FOR SAPGND 25 GROUNDSDA1 26 SERIAL DATA INPUT/OUTPUT (I2C-BUS)SCL 27 SERIAL CLOCK INPUT (I2C-BUS)

VCC 28 SUPPLY VOLTAGECOMP 29 COMPOSITE INPUT SIGNALVCAP 30 CAPACITOR FOR ELECTRONIC FILTERING OF SUPPLYCP1 31 CAPACITOR FOR PILOT DETECTORCP2 32 CAPACITOR FOR PILOT DETECTORCPH 33 CAPACITOR FOR PHASE DETECTORCADJ 34 CAPACITOR FOR PILTER ADJUSTMENTCER 35 CERAMIC RESONATOR ( 503KHz)

CMO 36 CAPACITOR DC-DECOUPLING MONOCSS 37 CAPACITOR DC-DECOUPLING STEREO/SAPLOR 38 OUTPUT LINE CONTROL, RIGHT CHANNELSOR 39 OUTPUT SELECTOR, RIGHT CHANNELAVR 40 INPUT AUTOMATIC VOLUME CONTROL, RIGHT CHANNELLIR 41 INPUT LINE CONTROL, RIGHT CHANNELCPS2 42 CAPACITOR 2 PSEUDO FUNCTIONCPS1 43 CAPACITOR 1 PSEUDO FUNCTIONEOR 44 OUTPUT EFFECTS, RIGHT CHANNEL

VIR 45 INPUT VOLUME CONTROL, RIGHT CHANNELLDR 46 INPUT LOUDNESS, RIGHT CHANNELOUTR 47 OUTPUT, RIGHT CHANNELNC 48 NOT CONNECTEDSW 49 FILTER CAPACITOR FOR SUBWOOFERB2R 50 BASS CONTROL CAPACITOR, RIGHT CHANNELB1R 51 BASS CONTROL CAPACITOR, RIGHT CHANNELTR 52 TREBLE CONTROL CAPACITOR

6.4 - IC 490 (4052)SIGN PIN DESCRIPTION

IN1A 2Y0 1 REAR AV 1 INPUT (R) JUST TO CR20310/29411IN3A 2Y2 2 REAR AV 1 INPUT (R) JUST TO CR20310/29411

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OUTB 1Z 13 OUTPUTIN2B 1Y1 14 AV3 ( L) INPUT TO CR29411 AND VIDEO INPUT TO CR14300/20300IN3B 1Y2 15 AV1 ( L) INPUT TO CR20310/29411 - AUDIO INPUT TO CR14300/20300

VDD VCC 16 SUPPLY VOLTAGE

6.5 IC102 (M24CO4MN)SIGN PIN DESCRIPTION

AO 1 GROUNDA1 2 GROUNDA2 3 GROUND

VSS 4 GROUNDDAS 5 SERIAL DATASCL 6 SERIAL CLOCKTEST 7 GROUNDVDD 8 SUPPLY VOLTAGE

6.6 - IC 601 (TDA9309) 14 20 (TDA8177F) 29


Idrive (neg) 1 NON-INVERTING INPUTVCC 2 SUPPLY VOLTAGE (12V)Vp 3 FLYBACK GENERATORGND 4 GROUNDOUT 5 OUTPUTREF 6 OUTPUT STAGE SUPPLYIdrive (pos) 7 INVERTING INPUT

6.7 - IC 401 (TDA7499)


Vs- 1 DC SUPPLY VONTAGEOUTR 2 OUTPUT RIGHT CHANNELVS+ 3 DC SUPPLY VOLTAGE (12V)

OUTL 4 OUTUPUT LEFT CHANNELMUTE 5 MUTEVs- 6 DC SUPPLY VONTAGE (-12V)IN+ 7 INPUTIN- 8 INPUTGND 9 GROUNDIN 10 INPUT

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7.0 - OPERATION DESCRIPTION TELEVISION SET CIRCUIT

Fig.1- Block diagram

Speaker

CRT

The block diagram in Fig.1 shows how the TV set circuit works divided into 8 basic circuits.

7.1 - POWER SUPPLY

IC901, IC902, IC903, T901, Q901 and surrounding components (9xx)

This is a switching mode power supply designed to operate in AC power source from 99 Volts to 242 Voltsand 50/60 Hertz.The main device is the TDA16846 (controller for switching mode power supplies).There are two different operating modes, low power standby and full operation mode.

-Standby: The power supply works in the burst mode and the circuit turn-on during 2 ms and turn-offduring 12 ms. In this mode the power consumption is less than 2 Watts in 120 V AC and less than 3 Watts in220 V AC. In the burst mode, the output voltages are reduced to 10% of the normal values (exceptmicroprocessor supply voltage) .

-Full operation mode: This mode is activate by the microprocessor (Remote control or front panel). Theoutput voltages regulation is controlled by the IC903 circuit, opto coupler feedback (IC902) and by the IC901.

The basic output voltages are:1. 108/128 Volts (CR14300_20300/CR20310_29411) to horizontal circuit;2. +12 and 12 Volts to audio and vertical circuits;3. 9 Volts to TV signal processor, stereo decoder and AV circuits;4. 5 Volts to microprocessor and memory circuits;5. 3.3 Volts to microprocessor and front panel switches circuits.

There are 3 basic protection mode:

3.Tuner

4. AVswitches

1. Power Supply

2. TV signal processorand MicroprocessorCircuit

5. Stereodecoder

7.Videooutput

8.Horizontaland verticaldeflections

6.Audiooutput

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-Enhanced 80C51 microprocessor core;-Internal program memory (48 Kbytes ROM and 1 Kbytes RAM);-High performance OSD;-Closed Caption decoder;-I2C bus serial I/O;-Only one reference (12 MHz) crystal for all internal timing;-Multi-standard vision IF circuit (45.75 MHz) with PLL demodulator;-PAL/NTSC color decoder with automatic search system;-Integrated luminance and chrominance circuit;-RGB control circuit;-8V and 3.3V supply voltages;-Horizontal and vertical geometry processing.

An external E2PROM (IC102) with 4 Kb is used to keep the setup and calibration configuration by I2C bus(channels, volume, horizontal and vertical geometry, etc.).

Front panel buttons and IR decoders are also realized by IC101.

7.3 - TUNER

TU201, SF201 and surrounding components (2xx).

This is a standard Frequency Synthesizer Tuner (FST Tuner) which covers VHF and UHF channels,including cable channels (frequency range from 55.25 MHz to 801.25 MHz).

This device is controlled by I2C bus. The output signal (IF output) is connected to the IC101 through a SAWfilter (SF201).

7.4 - AV SWITCHES

Q330, Q331, Q340, Q351, Q341, Q350, IC490 and surrounding components.

The external audio and video signals (AV1, AV2, AV3) are selected by the Micro Controller using two outputsignals (SW0_pin10 and SW1_pin11 IC101). The video signals are selected using standard transistors andthe audio signals are selected using the IC490 (4052)

The selected video signal is connected to the TV signal processor external video input and the selectedaudio signal is connected to the TV signal processor (mono models) or to the stereo decoder (stereomodels).

7.5 - STEREO DECODER

IC450, Q450, Q450R and surrounding components.

This circuit is used only in stereo models and the main device is TDA9855 (stereo decoder).Using I2C bus, the IC101 can identify a stereo and SAP signals.

This device combines stereo decoder and audio processor. In stereo models, this device offers automaticvolume level control, special effects, volume control, bass control and treble control.

7.6 - AUDIO OUTPUT

IC401, Q401, SP401, SP401R and surrounding components.

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7.8 - HORIZONTAL AND VERTICAL DEFLECTIONS

IC601, T701, T702, Q701 and surrounding components.

Vertical deflection circuit uses a TDA9309 (IC601 - vertical deflection booster) and operates with around 24Vand provides output current to drive the yoke. The input signals are vertical drive A and B from the TV signalprocessor (VDRA_pin22 and VDRB_pin21 IC101).

Horizontal deflection circuit uses 15.7KHz signal (HOUT_pin33 IC101) to drive the fly back transformer(T701) and provides the output current to drive horizontal deflection coil (yoke) and others CTR voltages(HV, focus, screen and etc.).

The vertical deflection circuit has one protection mode (turn-off the power supply if a fault situation isdetected) and the horizontal deflection circuit has two protection modes:-turn-off the power supply if a HV over voltage is detected (X-ray protection);

-turn-off the power supply if a horizontal drive transistor (Q701) overstress is detected.

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8.0 - REPAIR PROCEDURE FLOWCHART AUDIO CIRCUIT

Models CR20310/29411

Check: IC450 pin 6

and 47 signals.OK ?

Check IC 410and around

components.

Connect the AVInput signal.

OK ?

Check IC450 pin29 signal .

Check : IC450Pins 26 and 27.

OK ?

CheckR453 and R454

ReplaceIC 450

No

No

No

Yes Yes

Yes

Without sound

Check IC101C404

IC101 pin 43Signal.

OK ?

Models CR14300/20300

No

Yes

IC101 pin 28Signal .

OK ?

Yes

C404

R445/430No

Q430

C440/431R432

IC490 or VCC

IC101 C409

IC 490 pin

14 Signal.

OK ?

No

No

No

Yes

Yes

Yes

IC 490 pin 13

signal.

OK ?

IC101 pin 43Signal.

OK ?

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8.1 REPAIR PROCEDURE HORIZONTAL CIRCUIT

START

Is there VCCIn

pins 14/39/54/56/61?

Check the VCC in the

power supply

IC101 pin 33

Signal.

OK ?

Check

X101 or IC101

Q702: Collector voltage.

OK ?

Check :R715, R716,

C716 and T702

Q701Ok ?

Replace T701

Check

C714C715

Ok ?

replace

Flyback pin 1 voltage.

Ok ?Check: flyback

Yes

Yes

Yes

Yes

Yes

Yes

No

No

No

No

No

No

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8.2 REPAIR PROCEDURE FLOWCHART POWER SUPPLY CIRCUIT- Stand by mode

Check: C909

Voltage.OK ?

Start

Stand by

Is F901

open?

Check: IC901pin 4 and 13signals. OK ?

V

Check:: IC 101,powerand

horizontal flowchart

Check : TH901

Check: TH901,

IC901 and Q901

Check: Q901

D910 C919Replace IC 901

Check in whichpin lacks voltage

and to correct

Check: IC901

Voltage. OK?

Yes Yes

NoNo

Yes

No

Yes

No Yes

No

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8.3 REPAIR PROCEDURE FLOWCHART TUNER

TV doesnt TUNE IN

Check:

TunerPins 4 and 5 .

OK ?

Check: tuner supply

voltage.

OK ?

Check: R206,

R207, IC101 andIC102

Replace tuner

Fix the fault

Yes

Yes

No

No

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TV DOESNTTURN ON

Check:

IC101 pins14/39/54/56/61 (supply voltage).

OK ?

Fix the voltagesupply

Check: IC 101,Q904 and R927

If its 12V, TV is in

stand by mode

Check:D912

Check:D912 gate pin (9V).

OK ?

CheckQ904 signal.

OK ?

No

No

No

Yes

Yes

Yes

8.4 REPAIR PROCEDURE FLOWCHART POWER SUPPLY - MAIN CIRCUIT

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8.5 REPAIR PROCEDURE FLOWCHART - SAP CIRCUIT

Check or replace

IC490/R120/R109

Check orreplaceIC101 / C404

WITHOUT SAP

Check: IC101 pin 28signal.

OK ?

Check: IC430 pin 4

signal.OK ?


OK ?


OK ?

Check or replace

IC430/R434/IC401

IC1401/Q410/Sp.

Check or replace

R126I / C101

Check or replace

Q430/ C432 / R433

No

No

No

No

Yes

Yes

Yes

Yes

NoCheck: IC490 pin13 signal.

OK ?

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8.6 REPAIR PROCEDURE FLOWCHART VERTICAL CIRCUIT

Vertical closed

IC601 pins 4and 6voltage. OK?

Yoke

Connected ?

IC601 pins 1and 7

signals?

IC101 pins21 and 22

signals?

Check:

IC601Ok ?

Check or replace

IC101

Fix the fault

Check or replaceC601/602

R601/602/613/R612

Fix the fault

Check: VCC+12 and -12

Yes

Yes

Yes

No

NoNo

No

No

Yes

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8.7 REPAIR PROCEDURE FLOWCHART VIDEO AND CHROME CIRCUIT

CHROME AND VIDEO

Check: IC101pin 38, video packsignal.

OK ?

Check: IC101 pin 40(same signal pin 38).

OK ?

Check:AV external video

Signal.OK ?

IC101

Check: IC101

Yes

Yes

Yes

No

No

No

Check: C301

Check: IC101 pin

34 signal.

OK ?

Fix the fault

Yes

No

Check: IC101

X101

C105/106

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IC101 pin 22 one chip 0.78Vpp

5 ms

IC101 pin 21 one chip 0.5 Vpp

5 ms

IC601 pin 7 Vertical 63Vpp

5 ms

IC901 pin 13 Power 11.5Vpp

5 s

9 WAVEFORMS

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IC101 pin 38 one chip 1.5VPP

IC101 pin 40 0.6Vpp

20

IC101 pin 34 one chip 5.7 Vpp

IC101 pin 33 0.95Vpp

20 s

20 s

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IC101 one chip Pin 53 B 4.5 Vpp

20 s

IC101 one chip Pin 52 G 3.8Vpp

Q702 collector pin 100Vpp

20

Q701 base pin 10Vpp

20 s

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CRT Socket Pin 6 G-K 98Vpp

20 s

CRT Socket Pin 11 B 98Vpp

20 s

CRT Socket Pin 8 R 98Vpp

IC101 one chip Pin 51 R 4.5Vpp

20 s

* MODEL's DIFERENCES

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MONOMODELS

20" STEREO

ONLY FOR 20" STEREO

CR14300/20300/20310 STEREO

SCHEMATIC DIAGRAM

*

*

TOC450 FORSTEREOMODEL

TO C405R FOR MONO MODELS

AUDIO L

C405

AUDIO RC405R

TOC405RAUDIOR

TOC405AUDIOL

ONLY FOR 20" STEREO

01D E01DE-155-001-012

11/JUL/2001

*R815/815A

R835/835A

CR20300CR14300POS/MOD CR20310ST

PINS FOR 20" CRT SOCKET (*)

ONLY FOR 20" STEREO

ONLY FOR 20" STEREO

ONLY FOR 20" STEREO

AV2

FRONT

AUDIO OUTPUT

AV1

REAR

TO R403

COLDLIVE

GND - CLOSE TO TUNER

65

cr14300-cr20300-cr20301-cr29411

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