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THOMSON RCA CR29TF420 Service Data

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CR29TF420
FEB/02
A-PDF MERGER DEMO
Television
Basic Service Data
Adjustments (Onscreen Display) ...................................................................................
Circuit Decription ...........................................................................................................
Disassembly ...................................................................................................................
IC Pin Descriptions ........................................................................................................
Remote Control ..............................................................................................................
Replacement Partlist .......................................................................................................
Schematics
Servicing and Safety Checks ...........................................................................................
Specifications ..................................................................................................................
Troubleshooting Guides .................................................................................................
Waveforms ......................................................................................................................
CAUTION: Modification or repair of this unit by unauthorized persons is a direct violation of FCC Rules Part 68.216 and could
result in risk of electric shock. You are urged to contact a qualified factory authorized service facility for repairs.
Components having special safety characteristics are identified by a ( ) on schematics and on the parts list in this Service Data and its bulletins.
Before servicing this instrument, it is important that the service technician read and follow the "Safety Precautions" in the Basic Service Data.
First Edition - First Printing
Copyright 2002 - Thomson multimedia Inc.
Printed in U.S.A. - Trademark(s)
Interconnect Diagram ..................................................................................................
AV Switch ..................................................................................................................
Micro-Controller ........................................................................................................
One Chip ....................................................................................................................
Power Supply .............................................................................................................
Stereo Decoder and Audio Output .............................................................................
Tuner ..........................................................................................................................
Vertical and Horizontal Output ..................................................................................
Video Output ..............................................................................................................
USE ISOLATION TRANSFORMER WHEN SERVICING
®
Registered - Marca(s) Registrada(s)
Latin America After Sales
Indianapolis, IN 46290 U.S.A.
SERVICE DATA INDEX
SAFETY NOTICE
CR29TF420
Page
Number
9
21
5
15
14
37
46
47
48
49
50
51
52
53
54
2
3
24
32
CR29TF420

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Summary of Contents for THOMSON RCA CR29TF420

  • Page 1 Components having special safety characteristics are identified by a ( ) on schematics and on the parts list in this Service Data and its bulletins. Before servicing this instrument, it is important that the service technician read and follow the "Safety Precautions" in the Basic Service Data. First Edition - First Printing Copyright 2002 - Thomson multimedia Inc. CR29TF420 ®...
  • Page 2 3. ON-SCREEN DISPLAY ADJUSTMENT 3.1 Memory Initialization (First Power On) Before turn-on the set for the first time, it’s necessary to make a memory initialization of the Memory Chip (IC102). This adjustment is required only for the first power-on or wherever the Memory Chip have been changed.
  • Page 3 Press buttons “Channel up” and Channel down” to select the adjust to be done (hilighted in RED); Press buttons “Volume up” and “Volume down” to do the adjust; To cancel the “SERVICE MENU” unplug the set from the AC Power. 3.3 Service Menu Items HS = HORIZONTAL SHIFT AGC = AGC ADJUST...
  • Page 4 ILLUSTRATION 2 3.6 Vertical Adjustment Apply a circle Pattern Philips signal (RF Input); Using the remote control, set the MAGIC mode “ORIGINAL”; Activate the adjustment mode display (SBL item). Adjust SBL from 0 to 1. Blanking the bottom of the screen; Adjust VSH until the bottom of the pattern be aligned with the reference marks of the mechanical center on picture tube (the central vertical line in the center of the tube);...
  • Page 5 Adjust PW to aligne the Pin Cushion effect in the vertical lines in both sides of the screen; Adjust TC (trapezium) to aligne the vertical lines in both sides of the screen; Adjust CP to aligne the Pin Cushion effect vertical lines in the for edges of the screen. 3.8 “FOCUS”...
  • Page 6 3.9 White Balance Adjustment and Screen Adjustment 3.5.1- This adjustment must be done 20 minutes after turning on the TV set. Ambient illumination should be less than 20 Lux; 3.5.2- Adjust WR, WG, and WB to 20 and CD to 03; 3.5.3- Turn the Screen Grid Potentiometer fully counter clockwise;...
  • Page 7 6.0 - OPERATION DESCRIPTION- CP01LR02 TELEVISION SET CIRCUIT Fig.1- Block diagram 4.Tuner 2. TV signal 6. Stereo 7.Audio processor decoder output Speaker 8.Video 5. AV output switches 3. Micro controller 9.Horizontal 1. Power Supply and vertical deflections The block diagram in Fig.1 shows how the TV set circuit works divided into 9 basic circuits. 6.1 - POWER SUPPLY IC901, IC902, IC903, T901, Q901 and surrounding components (9xx).
  • Page 8 The highlights of this device are: -I2C bus serial I/O; -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 supply voltage; -Horizontal and vertical geometry processing. 6.3 –...
  • Page 9 This circuit uses external mute system (Q410) to minimize speaker noise during turn on/off. 6.8 - VIDEO OUTPUT Q810, Q811, Q812, Q820, Q821, Q822, Q830, Q831, Q832 and surrounding components. The RGB signals from the signal processor (pins 19,20,21) ,are amplified to the CRT using a cascode transistors configuration.
  • Page 10 2. DISASSEMBLY INSTRUCTIONS Removal of mechanical parts and P.C. Boards. 2.1 Back Cabinet (refer to figure 2.1) > Remove the screws, which secure the back cabinet to the front cabinet. > Remove the screws, which secure the rear A/V input and output connectors. >...
  • Page 14 5 – DESCRIPTION OF THE FUNCTIONS – THE INTEGRATED CIRCUIT´S PINS 5.1 – IC 501 (TDA8843) SIGN DESCRIPTION SNDIF AUDIO IF INPUT AUDIOEXT EXTERNAL AUDIO INPUT NOT CONNECTED NOT CONNECTED PLLLF FILTER OF IF DECOUPLING IFVO COMPOSITE VIDEO OUTPUT SERIAL CLOCK OUTPUT SDA1 SERIAL DATA INPUT/OUTPUT (I2C-BUS) DECBG...
  • Page 15 IFIIN2 IF INPUT 2 EHTO HI VOLTAGE PROTECTION FILTER OF VERTICAL LREF REFERENCE CURRENT INPUT DECagc AGC DECOUPLING AGCOUT AGC VOLTAGE DELAY OUTPUT AUDEEN AUDIO DEENPHASIS DECSDEM AUDIO DECOUPLING 5.2 – IC 1401 (TDA9181) SIGN DESCRIPTION INPUT OF CHROME SINAL INPSEL SWITCH OF INPUT SELECTION Y/CVBS2...
  • Page 16 5.5 - IC 430 (TDA1519A) SIGN DESCRIPTION NINV NON-INVERTING INPUT GROUND NOT CONNECTED OUT(1) OUTPUT ( 1 ) GROUND OUT( 2 ) OUTPUT ( 2 ) SUPPLY VOLTAGE M/SS MUTE INPUT INVERTING INPUT 5.6 - IC 401 (TDA2616) SIGN DESCRIPTION NINV1 NON-INVERTING INPUT 1 MUTE...
  • Page 17 5.9 - IC 1504 (LA7016) SIGN DESCRIPTION SUPPLY VOLTAGE EXTERNAL AUDIO INPUT SWITCHING OF INPUTS CONTROL AUDIO OUTPUT GROUND NOT CONNECTED NOT CONNECTED TUNER AUDIO INPUT 5.10 - IC 450 (TDA9855) SIGN DESCRIPTION TREBLE CONTROL CAPACITOR, LEFT CHANNEL BASS CONTROL CAPACITOR, LEFT CHANNEL BASS CONTROL CAPACITOR, LEFT CHANNEL OUTS OUTPUT SUBWOOFER OR OUTPUT SURROUND SOUND...
  • Page 18 INPUT LINE CONTROL, RIGHT CHANNEL CPS2 CAPACITOR 2 PSEUDO FUNCTION CPS1 CAPACITOR 1 PSEUDO FUNCTION OUTPUT EFFECTS, RIGHT CHANNEL INPUT VOLUME CONTROL, RIGHT CHANNEL INPUT LOUDNESS, RIGHT CHANNEL OUTR OUTPUT, RIGHT CHANNEL NOT CONNECTED FILTER CAPACITOR FOR SUBWOOFER BASS CONTROL CAPACITOR, RIGHT CHANNEL BASS CONTROL CAPACITOR, RIGHT CHANNEL TREBLE CONTROL CAPACITOR 5.11 - IC 101 (M37274MA086SP) / (M37274MA-207SP)
  • Page 19 SDA1 SERIAL DATA ( 1 ) SCL2 SERIAL CLOCK ( 2 ) SCL1 SERIAL CLOCK ( 1 ) SOMBRA SHADOW IN THE SCREEN TO CONTRAST CHARACTERS GAME GAME AUDIO OUTPUT PROD TEST POINT SYS2 COLOUR SYSTEM ID DESMAG TENSÃO TEMPORIZADA P/ ACIONAMENTO DA DESMAG. AUT. POWER TENSÃO PARA CHAVEAMENTO DE LIGA / DESLIGA MUTE...
  • Page 20 4 – REMOTE CONTROL Model CR29TF420 NOTE: Consult the original r. c. manufacturer documentation to access the schematic diagram and the replacement parts list. The “MENU” button contains the following operations:...
  • Page 21 SERVICING NOTICES ON CHECKING 1. Keep the notices As for the places which need special attentions, they are indicated with the labels or seals on the cabinet, chassis and parts. Make sure to keep the indications and notice in the operation manual. 2.
  • Page 22 1 - GENERAL SPECIFICATIONS - CP01LR02 CHASSI 1.1 Product Model: CR29TF420 ..............27” Diagonal Flat–Screen Stereo. 1.2 Power Supply: a) Power Source Range ..............99-242 ~ 50/60 Hz A.C.. b) Power Supply: automatic commutation. c) Power Consumption: Maximum Power Consumption ................145W. Maximum Stand By Consumption ......3W (120VAC) and 5W (220VAC). d) High Voltage (Fly back Anode Voltage) and beam current: High Voltage .....................28,0 ±...
  • Page 23 1.7 Speaker Output: ........................14W RMS. 1.8 Antenna Input Impedance: VHF/UHF/CABLE.........75 Ohms unbalanced (“F” type connector). 1.9 Terminals: Inputs ................1 Front Stereo Audio and Video........2 Rear Stereo Audio and Video and 1 S-Video (S-VHS). Input minimum impedance …................10kOhms. Audio input signal level ..............400 to 800mVrms. Video input signal level ...................1Vpp.
  • Page 24 7 – REPAIR PROCEDURE FLOWCHART 7.1 – POWER SUPPLY – Stand by mode Start Check: IC 101, IC Stand by 904 and horizontal flowchart Check: C905 Check R901 Is F901 Voltage. OK? open? Check IC901 and Q901 Check: Check: IC901 Check in which IC901 pin 4 Voltage.
  • Page 25 7.2 – VERTICAL CIRCUIT Vertical closed IC601 pins Check D702, Tensão no Tensão no pino 6 do IC pino 6 do IC 2and 3 R709 and Voltage. OK? C716 Yoke Fix the fault connected? R601, Pins 1 C605,C606 Fix the fault and 7 and R603, signals?
  • Page 26 7.3 – AUDIO CIRCUIT No sound IC501 pin 1 Check C406, Check R401, IC501 pin signal? C405 and C401, C403 and 15 signal, IC501 MF401 Connect the IC540 pins 6 AV input and 47 signal. signals? Verificar inform. Check: Check IC401 and Check IC450 pin De dados nos IC405.
  • Page 27 7.4 – VIDEO AND CHROME CIRCUIT Chrome and Video Check: IC501 pin IC101 6, video pack signal. OK? Check: IC501 pin MF 301 C302 Check: Q301, 13 (same signal Q302 and C303 pin 6). Check: AV Check: IC501 Check: IC501 external pin 41 signal.
  • Page 28 7.5 – POWER SUPPLY – MAIN CIRCUIT TV doesn´t turn on Check IC101 pin 45 H=OFF L=ON Check Fix the IC101. Data, fault clock, reset, Check Q920 R122 signal. Check Check R125, C123, C0931, IC101 pin R952, Q923, R914, 8 OK? R934 and C930 IC904, R924 Check...
  • Page 29 7.6 – HORIZONTAL CIRCUIT Start Check a alimentação no IC501 pin 37 pino 2 do Ic 904. and 12. R 922, 927, Ic Voltage=8V? 101. Check 3,58, IC501 pin 40 IC501 signal. Replace Yoke Horizontal Yoke E.H.T. Fly Back Check Q702: R701, 744, Collector...
  • Page 30 7.7 – CHARACTERS CIRCUIT No characters C112, R109, Check IC101 pins 1 and 2. R108, ZD702, Horizontal R710, C709 and vertical pulse? and C111 Check IC101 IC101, C110, pins 50, 51 and C109 and C108 52. Pulse? C363, C364 and C365...
  • Page 31 7.8 – TUNER CIRCUIT TV doesn´t tune in Check: R206, Check: tuner R207 and pins 4 and IC101 5. OK? Fix the fault Check: tuner Tuner supply voltage.
  • Page 32 8 – WAVE FORMS IC901 – Pin 2 Power 2Vpp 5µ s IC901 – Pin 13 Power 11.8Vpp 5µ s IC101 – Pin 2 Micro Controller 4.5Vpp 5 ms IC101 – Pin 1 Micro Controller 6Vpp 10µ s...
  • Page 33 IC101 – Pin 22 Micro Controller 0.56Vpp 20 µ IC501 – Pin 6 One Chip 1.5Vpp 20µ s IC501 – Pin 40 One Chip 1.7Vpp 20µ s IC501 – Pin 41 One Chip 5.7Vpp 20 µ s...
  • Page 34 IC501 – Pin 47 One Chip 1.4Vpp 5 ms IC501 – Pin 51 One Chip 3.1Vpp 5 ms IC601 – Pin 5 Vertical 44Vpp 5 ms Q702 Collector Pin 34Vpp 20µ s...
  • Page 35 Q702 Collector Pin 7.6Vpp 20µ Q701 Base Pin 10Vpp 20µ s IC501 One Chip – Pin 19 – B 2Vpp 20 µ s IC501 One Chip – Pin 20 – G 2Vpp 20 µ s...
  • Page 36 IC501 One Chip – Pin 21 – R 2Vpp 20µ s CRT Socket – Pin 6 – G-K 98Vpp 20 µ s CRT Socket – Pin 11 – B 98Vpp 20 µ s CRT Socket – Pin 8 – R 98Vpp 20 µ...
  • Page 37 REPLACEMENT PARTS CR29TF420 (See Product Safety Note on first page of this parts list) Symbol Stock Drawing Description Symbol Stock Drawing Description C221 T0000632 647984125004 CAP CERAM SMD 100NF 25V CR29TF420 Electrical Parts C301 T0000641 600763662000 CAP ELECT 10UF 50V C303 C / P 601078320003...
  • Page 38 REPLACEMENT PARTS (Continued) CR29TF420 (See Product Safety Note on first page of this parts list) Symbol Stock Drawing Description Symbol Stock Drawing Description C414 C / P 600463696002 CAP ELECT 2200UF 25V C477R T0000649 6490A3178006 CAP CERAM SMD 5.6NF 50V C415 C / P 600363672006...
  • Page 39 REPLACEMENT PARTS (Continued) CR29TF420 (See Product Safety Note on first page of this parts list) Symbol Stock Drawing Description Symbol Stock Drawing Description C704 T0000657 900163747006 CAP CERAM 470PF Y5R 2KV C904 T0000670 642863827000 CAP CERAM 4.7NF 500V Y5U C705 T0000663 610160964006 CAP POLYPROPYLENE...
  • Page 40 REPLACEMENT PARTS (Continued) CR29TF420 (See Product Safety Note on first page of this parts list) Symbol Stock Drawing Description Symbol Stock Drawing Description CF990 T0000803 4103A0045024 CONECTOR CABLE 2V IC102 T0000812 461252142000 IC M24C04 EEPROM 4K CLMP01 N / A 540162728008 CLAMP (X24C04P)
  • Page 41 REPLACEMENT PARTS (Continued) CR29TF420 (See Product Safety Note on first page of this parts list) Symbol Stock Drawing Description Symbol Stock Drawing Description Q301 T0000720 462784592001 TRANSISTOR SMD NPN 45V Q923 T0000727 462162287001 TRANSISTOR 250V 50MA 100MA (BC-847B) Q302 T0000720 462784592001 TRANSISTOR SMD NPN 45V R101...
  • Page 42 REPLACEMENT PARTS (Continued) CR29TF420 (See Product Safety Note on first page of this parts list) Symbol Stock Drawing Description Symbol Stock Drawing Description R204 C / P 660400492000 RES CARBON 2.7K 5% R413 N / A 6666A5307005 RES SMD 680R 5% 63MW 330MW R413R N / A...
  • Page 43 REPLACEMENT PARTS (Continued) CR29TF420 (See Product Safety Note on first page of this parts list) Symbol Stock Drawing Description Symbol Stock Drawing Description R491R C / P 660400487007 RES CARB 1K 5% 330MW R723 C / P 660400475009 RES CARBON 100R 5% R492 C / P 660400499005...
  • Page 44 REPLACEMENT PARTS (Continued) CR29TF420 (See Product Safety Note on first page of this parts list) Symbol Stock Drawing Description Symbol Stock Drawing Description R832 T0000840 6628A4664000 RES METAL 8.2K 5% 3W S101 T0000849 430197243000 TACT SWITCH R833 N / A 6666A5307005 RES SMD 680R 5% 63MW S102...
  • Page 45 REPLACEMENT PARTS (Continued) CR29TF420 (See Product Safety Note on first page of this parts list) Symbol Stock Drawing Description Symbol Stock Drawing Description IC401B N / A 212160746009 WASHER PR 3.2X5.5X0.8 IC401C N / A 210160708000 SCREW M3X12 PAN IC401D N / A 211160753005 NUT M3 CR...