THOMSON RCA CR29TF420 Instrucciones de montaje

CR29TF420

FEB/02

CR29TF420

Television

LatinAmericaAfterSales

Indianapolis, IN 46290 U.S.A.

SERVICE DATA INDEX

USE ISOLATION TRANSFORMER WHEN SERVICING

SAFETY NOTICE

Componentshaving specialsafety characteristicsare identifiedby a( ) onschematics andon theparts listin thisService Dataand itsbulletins.

Before servicing this instrument, it is important that the service technician read and follow the "Safety Precautions" in the Basic Service Data.

CR29TF420

Basic Service Data

FirstEdition-FirstPrinting

Printed in U.S.A. - Trademark(s)®Registered - Marca(s) Registrada(s)

Page

Number

Adjustments (Onscreen Display)................................................................................... 9

Circuit Decription........................................................................................................... 21

Disassembly ................................................................................................................... 5

IC Pin Descriptions ........................................................................................................ 15

Remote Control .............................................................................................................. 14

Replacement Partlist....................................................................................................... 37

Schematics

InterconnectDiagram.................................................................................................. 46

AV Switch .................................................................................................................. 47

Micro-Controller ........................................................................................................ 48

One Chip .................................................................................................................... 49

Power Supply............................................................................................................. 50

Stereo Decoder and Audio Output ............................................................................. 51

Tuner .......................................................................................................................... 52

Vertical and Horizontal Output.................................................................................. 53

Video Output.............................................................................................................. 54

ServicingandSafetyChecks ........................................................................................... 2

Specifications..................................................................................................................3

Troubleshooting Guides ................................................................................................. 24

Waveforms...................................................................................................................... 32

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.

A-PDF MERGER DEMO

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.

With the TV set unplugged from the AC Power keep pushed simultaneously the buttons “Channel

up” and “Channel down” in the front panel. Then plug it and wait 20 seconds before release the

buttons. Press “POWER”.

To certify that the initialization was success executed, it will appear the following message:

ILLUSTRATION 1

3.2 OSD Adjustment – Service Mode

To obtain the “SERVICE MENU” do the following procedure:

With the TV set unplugged from the AC Power keep pushed the button “Volume up” in the front

panel and plug it;

After 20 seconds release “Volume up” and press “Power”;

Press “Volume up” and “Volume down” simultaneously and will be displayed the “SERVICE

MENU”;

TO RUN AUTOMATIC

TUNING NOW

PLUG THE ANTENNA

<NO >YES

HS 1C VSH 21 SL 08

EW 1D WR 20 ADJ 0

PW 12 WG 20 A1 01

CP 15 WB 20 A2 02

TC 1D AGC 10 TC 03

VS 29 CD 03 OM 0

VA 05 SBL 0

SC 08 VSD 0

I2C 00 NORMAL

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

EW = HORIZONTAL WIDTH CD = CATODE DRIVE LEVEL

PW = PIN CUSHION (CENTER) SBL = SERVICE BLANKING

CP = PIN CUSHION (EDGES) VSD = VERTICAL SERVICE SWITCH

TC = TRAPEZIUM CORRECTION SL = AUDIO LEVEL ADJUST

VS = VERTICAL SLOPE ADJ = STEREO ADJUST

VA = VERTICAL AMPLITUDE A1 = WIDEBAND

SC = VERTICAL LINEARITY A2 = SPECTRAL

I2C = STATUS OF I2C TC = CURRENT ADJUST

VSH = VERTICAL SHIFT OM = FACTORY PICTURE SETTINGS

WR/WG/WB = WHITE POINT ADJUST

3.4 AGC Adjustment

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

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

Adjust AGC to Zero and measure the voltage (V1);

Adjust AGC so that the indication on the voltmeter be (V1) - 1 ± 0.2V.

3.5 Stereo 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 microAmpère meter of 24µA in the pin 17 of IC450;

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

Adjust SL to 500±20mVrms in the pins 15 and 38 of IC450;

Apply in the channel L=300Hz and in the channel R= 3k, 14% of generator Stereo modulation

DBX-NR (EIDEN BTSC );

Change ADJ from 0to 1. Check A1 and A2 after 1 second (if they varied);

After 1 second returns ADJ to 0. The stereo circuit will align automatically.

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 0to 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);

Adjust VS until the central line be aligned with the half bottom of the screen (the central line of the

circle pattern in the half cut of the screen);

Return SBL from 1to 0value . 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/or VS

3.7 Horizontal Adjustment

Apply a Circle Pattern Philips signal at the antenna terminal. Set Magic ORIGINAL;

In the SERVICE MENU adjust EW for horizontal widht and HS for symetrical horizontal position of

the image;

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” Adjustment

Apply a Circle Pattern Philips signal at the antenna terminal. Magic ORIGINAL;

Adjust Focus V potenciometer (vertical) for the better focus on the vertical lines in the center of the

screen;

Adjust Focus H potentiometer (horizontal) for the better focus on the horizontal lines inthe center of

the screen;

Check the focus on the areas indicated below and readjust Fovus V na H if necessary.

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;

3.5.4- Short circuit C803 to Ground (located in the CPT PCI) and change the register VSD FROM

0 TO 1 (for cutting Vertical;

Deflection) and turn the Screen potentiometer gradually clockwise and set it to the point where a

thin bright line begin to appear on CPT. Remove the short circuit of C803 and change VSD FROM

1 TO 0;

3.5.5- Check the White Balance and readjust WR,WG and WB if necessary.

6.0 - OPERATION DESCRIPTION- CP01LR02 TELEVISION SET CIRCUIT

Fig.1- Block diagram

Speaker

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).

This is a switching mode power supply designed to operate in AC power source from 99 Volts to 242 Volts

and 50/60 Hertz.

The main device is the TDA16846 (controller for switching mode power supplies).

In stand-by mode , the micro-controller disables the IC904 (+9Vdc regulator) ,turning-off the tuner ,the stereo

decoder ,the AV switches and the TV signal processor circuit . In this condition ,the horizontal and vertical

deflections and audio output circuits are stopped with a low current consumption . Only the micro-controller

is active .

The power-on is activate by the micro-controller (pin45) though the remote control or the power switch in the

front panel ,that turns-on the +9V supply waking up the circuit .

The output voltages are controlled by the IC901 through the opto coupler feedback (IC902) and a reference

voltage given by IC903 .

The basic output voltages are:

1. +130 Volts for the horizontal circuit;

2. +18 Volts for audio output circuits;

3. +9 Volts for TV signal processor, stereo decoder and AV circuits;

4. +5 Volts for microprocessor and memory circuits.

There are 3 basic protection mode:

1. AC power source undervoltage: the power supply will turn-off when the AC source is less than 90 Volts;

2. Power consumption limit: when the power consumption exceed 20% of the normal value;

3. Overvoltage outputs shutdown: when the output voltages exceed 20% of the normal values.

6.2 - TV SIGNAL PROCESSOR

IC501 and surrounding components.

The main device is the TDA8843, that combines all the functions for a multi-system color TV application with

closed caption.

4.Tuner

5. AV

switches

1. Power Supply

2. TV signal

processor

6. Stereo

decoder

8.Video

output

9.Horizontal

and vertical

deflections

7.Audio

output

3. Micro controller

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 – MICRO-CONTROLLER

IC101, and surrounding components.

This is a 8bit micro-controller dedicated for TV applications (M37274MA). It controls all the circuits by two

I2C bus lines. Main features:

- 8MHz crystal oscillator for internal timing.

- internal memory: ROM 40Kbytes and RAM 768 bytes.

- closed caption decoder.

- 5V supply voltage.

- 32KHz crystal oscillator for clock functions.

- high performance OSD.

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.

6.4 - TUNER

TU201, and surrounding components.

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 IF output signal (45.75 MHz) is connected to the IC501 through a

SAW filter (MF201).

6.5 - AV SWITCHES

IC470 , IC480 and surrounding components.

The external audio and video signals (AV1, AV2, AV3) are selected by the Micro Controller using two output

signals ( pin47 av2 and pin48 av1, IC101). The video signals are selected using IC480 (LA7221), and the

audio signals are selected using the IC470 (4052).

The selected video signal is connected to the TV signal processor external video input (pin17) and the

selected audio signal is connected to the stereo decoder IC450 (pins 12 and 41).

6.6 - STEREO DECODER

IC450 and surrounding components.

The main device is TDA9855 (stereo / sap decoder with DBX noise reduction system).

Using I2C bus, the IC101 can identify a stereo and SAP signals.

This device combines stereo decoder and audio processor with automatic volume level control, special

effects, volume/balance controls, bass control and treble control.

Q450 and Q450R are buffers for the audio output jacks (JA450).

6.7 - AUDIO OUTPUT

IC401, SP401, SP401R and surrounding components.

The main device is TDA2616 (stereo amplifier). The output signal is a 5+5 Watts with a 8 ohms speakers.

The input signals come from the stereo decoder (IC450 pins6 and 47).

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.

6.9 - HORIZONTAL AND VERTICAL DEFLECTIONS

IC601, T701, T702, Q701 and surrounding components.

Vertical deflection circuit uses a TDA8177F (IC601 - vertical deflection booster) and operates with around

24V and provides output current to drive the yoke. The input signals are vertical drive + / - from the TV signal

processor (pin46 and 47 of IC501).

Horizontal deflection circuit uses 15.7KHz signal (HOUT_pin40 IC501) 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 is

detected) 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.

2. DISASSEMBLY INSTRUCTIONS

RemovalofmechanicalpartsandP.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.

> Removethebackcabinet.

2.2 CRT PCB (refer to figure 2.2/2.3)

Caution:

Beforeremovingtheanodecap,dischargeelectricitybecauseitcontainsahighvoltage. Beforeattemptingtoremove

or repair any PCB, unplug the power cord from the AC source.

> Removetheanodecap.

> Disconnectthegroundconnector(CM801).

> RemovetheCRTPCB.

2.3 Main PCB (refer to figure 2.2/2.3)

> Disconnectthefollowingconnectors: CM901,CM902,CM701,CM601,CM401andCM402.

> Unlock the PCB from the cabinet (both sides of the board).

> RemovetheMainPCB.

2.4 CRT (refer to figure 2.4)

> Removethefour(4)screws.

> RemovetheCRT.

Note:

TheREMOVALOFTHEANODECAP-AfterturningthepowerOFF,theremightstillbeapotentialvoltagethatisvery

dangerous. Whenremovingthe ANODECAP,make suretodischarge the anode'scappotential voltage. Donotuse

pliers to loosen or tighten the anode cap terminal. This may cause damage to the spring.

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