colour television chassis l01 - diagramasde.comdiagramas.diagramasde.com/televisores/philips chassis...

Published by RB 0168 Service PaCE Printed in the Netherlands Subject to modification � 3122 785 11160

©Copyright 2001 Philips Consumer Electronics B.V. Eindhoven, The Netherlands.All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, or otherwise without the prior permission of Philips.

Colour Television Chassis

L01.2AAA

(SMALL SCREEN)

CL 16532008_041.eps160501

Contents Page1. Technical Specifications, Connections and

Chassis Overview 22. Safety & Maintenance Instructions, Warnings

and Notes 43. Directions for Use 54. Mechanical Instructions 195. Service Modes, Error Codes and Faultfinding 206. Block Diagram, Testpoints, I2C And Supply

Voltage OverviewBlock Diagram 27Testpoint Overview 28I2C And Supply Voltage Overview 29

7. Electrical Diagrams and PWB’s Diagram PWBPower Supply (Diagram A1) 30 43-48Line Deflection (Diagram A2) 31 43-48Frame Deflection (Diagram A3) 32 43-48Tuner IF (Diagram A4) 33 43-48Video IF and Sound IF (Diagram A5) 34 43-48Synchronization (Diagram A6) 36 43-48Control (Diagram A7) 37 43-48Audio Amplifier (Diagram A8) 38 43-48BTSC (Stereo/SAP) Decoder (Diagram A9) 39 43-48Audio/Video Source Switching (Diagram A10) 40 43-48Front I/O + Control, Headphon (Diagram A12) 41 43-48Rear I/O Cinch (Diagram A13) 42 43-48CRT Panel (Diagram B) 49 50Side AV (Diagram E) 51 51Side AV and Headphone Panel (Diagram E1) 52 52

8. Alignments 539. Circuit Description 59

List of Abbreviations 6810 Spare Parts List 70

Technical Specifications, Connections and Chassis OverviewGB 2 L01.2A1.

1. Technical Specifications, Connections and Chassis OverviewIndex:1. Technical Specifications.2. Connections.3. Chassis Overview. Note: • Below described specifications are not valid for one

product, but for the whole product range. See Product Survey for specific models.

• Figures can deviate slightly from the actual situation, due to different set executions.

1.1 Technical Specifications

1.1.1 Reception

Tuning system : PLLColour systems : NTSC

: PAL B/G, D/K, I: SECAM B/G, D/K,

K1Sound systems : FM-mono

: FM-stereoA/V connections : NTSC 3.58, 4.43

: PAL 60Channel selections : 100 channels

: U, V, S, HAerial input : 75 �, IEC-type

1.1.2 Miscellaneous

Audio output : 1 x 4 W or,: 2 x 3 W or,: 2 x 5 W + 10 W (sw)

+ 2 x 3 WMains voltage : 90 - 276 V or,

: 150 - 276 V Mains frequency : 50 Hz or,

: 60 Hz Ambient temperature : + 5 to + 45 deg. CMaximum humidity : 90 %Power consumption : 36 W (14”) to

: 52 W (21”)Standby Power consumption : < 3 W

1.2 Connections

1.2.1 Front (or Side) Connections and Front (or Top) Control

Figure 1-1

A/V In (if present)1 - Video CVBS (1 Vpp / 75 �) ��2 - Audio L (0.2 Vrms / 10 k�) ��3 - Audio R (0.2 Vrms / 10 k�) ��4 - Headphone (8 - 600 � / 4 mW) ��

IRRED

- VOLUME +

- PROGRAM +

V+V-

P-

P+

LAudio

RVideo

MonoV- C+C-V+

CL 16532016_020.eps220501

C+C-V+V-

Technical Specifications, Connections and Chassis Overview GB 3L01.2A 1.

1.2.2 Rear Connections

Figure 1-2

Monitor Out1 - Video CVBS (1 Vpp / 75 �) ��2 - Audio L (0.5 Vrms / 1 k�) ��3 - Audio R (0.5 Vrms / 1 k�) ��

YUV In (if present)1 - Y 0.7 Vpp / 75 � ��2 - U 0.7 Vpp / 75 � ��3 - V 0.7 Vpp / 75 � ��

AV1 In4 - Video CVBS (1 Vpp / 75 �) ��5 - Audio L (0.5 Vrms / 10 k�) ��6 - Audio R (0.5 Vrms / 10 k�) ��

AV2 In1 - Video CVBS (1 Vpp / 75 �) ��2 - Audio L (0.5 Vrms / 10 k�) ��3 - Audio R (0.5 Vrms / 10 k�) ��

AV2 In (SVHS)1 - gnd �2 - gnd �3 - Y 1 Vpp / 75 � �4 - C 0.3 Vpp / 75 � �

1.3 Chassis Overview

Figure 1-3

V

L

R

Y

U

V

V

L

R

V

L

R SVHS

MONITOROUT

75 Ohm

FM

AV1IN

AV2IN

CL 16532008_005.eps120601

SIDE AV PANEL + HEADPHONEE1

SIDE AV PANELE

BCRT PANEL

MAIN

CHASSIS

PANEL

CL 16532008_043.eps240801

A1

A2

A3

A4

A5

A12

A9

A10

A8

A13

POWER SUPPLY

LINE DEFLECTION

FRAME DEFLECTION

A6SYNCHRONISATION

TUNER IF

VIDEO + SOUND IF

HEADPHONE + FR. CONTROL

A7CONTROL (µP)

NICAM + 2CS +

BTSC DECODER

A/V SWITCHING

AUDIO AMPLIFIER

REAR I/O CINCH

Safety & Maintenance Instructions, Warnings, and NotesGB 4 L01.2A2.

2. Safety & Maintenance Instructions, Warnings, and Notes

2.1 Safety Instructions For Repairs

Safety regulations require that during a repair:• Due to the ‘hot’ parts of this chassis, the set must be

connected to the AC power via an isolation transformer.• Safety components, indicated by the symbol �, should

be replaced by components identical to the original ones.• When replacing the CRT, safety goggles must be worn. Safety regulations require that after a repair, the set must be returned in its original condition. Pay particular attention to the following points:• General repair instruction: as a strict precaution, we

advise you to re-solder the solder connections through which the horizontal deflection current is flowing, in particular:– all pins of the line output transformer (LOT)– fly-back capacitor(s)– S-correction capacitor(s)– line output transistor– pins of the connector with wires to the deflection coil– other components through which the deflection

current flows.Note: This re-soldering is advised to prevent bad connections due to metal fatigue in solder connections and is therefore only necessary for television sets more than two years old.• Route the wire trees and EHT cable correctly and secure

them with the mounted cable clamps.• Check the insulation of the AC power cord for external

damage.• Check the strain relief of the AC power cord for proper

function, to prevent the cord from touching the CRT, hot components, or heat sinks.

• Check the electrical DC resistance between the AC plug and the secondary side (only for sets that have an isolated power supply). Do this as follows:1. Unplug the AC power cord and connect a wire

between the two pins of the AC plug.2. Turn on the main power switch (keep the AC power

cord unplugged!).3. Measure the resistance value between the pins of

the AC plug and the metal shielding of the tuner or the aerial connection of the set. The reading should be between 4.5 M� and 12 M�.

4. Switch the TV OFF and remove the wire between the two pins of the AC plug.

• Check the cabinet for defects, to prevent the possibility of the customer touching any internal parts.

2.2 Maintenance Instructions

It is recommended to have a maintenance inspection carried out by qualified service personnel. The interval depends on the usage conditions:• When the set is used under normal circumstances, for

example in a living room, the recommended interval is three to five years.

• When the set is used in an environment with higher dust, grease or moisture levels, for example in a kitchen, the recommended interval is one year.

• The maintenance inspection includes the following actions:1. Perform the 'general repair instruction' noted above.2. Clean the power supply and deflection circuitry on

the chassis.3. Clean the picture tube panel and the neck of the

picture tube.

2.3 Warnings

• In order to prevent damage to ICs and transistors, avoid all high voltage flashovers. In order to prevent damage to the picture tube, use the method shown in Fig. 2-1, to discharge the picture tube. Use a high voltage probe and a multi-meter (position VDC). Discharge until the meter reading is 0 V (after approx. 30 s).

Figure 2-1

• All ICs and many other semiconductors are susceptible to electrostatic discharges (ESD)�. Careless handling during repair can reduce life drastically. When repairing, make sure that you are connected with the same potential as the mass of the set by a wristband with resistance. Keep components and tools also at this potential. Available ESD protection equipment:– Complete kit ESD3 (small tablemat, wristband,

connection box, extension cable, and ground cable) 4822 310 10671.

– Wristband tester 4822 344 13999.• Together with the deflection unit and any multi-pole unit,

flat square picture tubes form an integrated unit. The deflection and the multi-pole units are set optimally at the factory. Adjustment of this unit during repair is therefore not recommended.

• Be careful during measurements in the high voltage section and on the picture tube.

• Never replace modules or other components while the unit is switched ON.

• When you align the set, use plastic rather than metal tools. This will prevent any short circuits and the danger of a circuit becoming unstable.

2.4 Notes

• Measure the voltages and waveforms with regard to the chassis (= tuner) ground (), or hot ground (�), depending on the area of circuitry being tested.

• The voltages and waveforms shown in the diagrams are indicative. Measure them in the Service Default Mode (see chapter 5) with a color bar signal and stereo sound (L: 3 kHz, R: 1 kHz unless stated otherwise) and picture carrier at 475.25 MHz (PAL) or 61.25 MHz (NTSC, channel 3).

• Where necessary, measure the waveforms and voltages with (�) and without () aerial signal. Measure the voltages in the power supply section both in normal operation (�) and in standby (�). These values are indicated by means of the appropriate symbols.

• The picture tube panel has printed spark gaps. Each spark gap is connected between an electrode of the picture tube and the Aquadag coating.

• The semiconductors indicated in the circuit diagram and in the parts lists are completely interchangeable per position with the semiconductors in the unit, irrespective of the type indication on these semiconductors.

V

CL 26532098/042140792

Directions for Use GB 5L01.2A 3.

3. Directions for Use

6

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Directions for UseGB 6 L01.2A3.

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Mechanical Instructions GB 19L01.2A 4.

4. Mechanical InstructionsIndex:1. Rear Cover Removal2. Service Position Main Panel3. Side I/O Panel Removal4. Rear Cover Mounting Note: Figures can deviate slightly from the actual situation, due to different set executions.

4.1 Rear Cover Removal

1. Remove all fixation screws of the rear cover. 2. Now pull the rear cover backward and remove it.

4.2 Service Position Main Panel

1. Disconnect the strain relief of the AC power cord.2. Remove the main panel, by pushing the two center clips

outward [1]. At the same time pull the panel away from the CRT [2].

3. Disconnect the degaussing coil by removing the cable from (red) connector 0201.

4. Move the panel somewhat to the left and flip it 90 degrees [3], with the components towards the CRT.

Figure 4-1

4.3 Side I/O Panel Removal

1. Remove the complete Side I/O assembly after unscrewing the 2 fixation screws [1].

2. Release the two fixation clamps [2] and lift the board out of the bracket.

Figure 4-2

4.4 Rear Cover Mounting

Before you mount the rear cover, perform the following checks:1. Check whether the mains cord is mounted correctly in its

guiding brackets.2. Replace the strain relief of the AC power cord into the

cabinet.3. Check whether all cables are replaced in their original

position.

A

B

1

CL 16532016_006.eps220501

2

1

3

CL 06532012_004.eps030200

Service Modes, Error Codes and Fault FindingGB 20 L01.2A5.

5. Service Modes, Error Codes and Fault FindingIndex:1. Test points.2. Service Modes.3. Problems and Solving Tips (related to CSM).4. ComPair.5. Error Codes.6. The Blinking LED Procedure.7. Protections.8. Repair Tips.

5.1 Test Points

The chassis is equipped with test points printed on the circuit board assemblies. These test points refer to the functional blocks:

Figure 5-1

The numbering is in a logical sequence for diagnostics. Always start diagnosing within a functional block in the sequence of the relevant test points for that block. Perform measurements under the following conditions:• Service Default Mode (when this mode is not present, set

all controls to 50%, set volume to 25% and select channel 3).

• Video: colour bar signal.• Audio: 3 kHz left, 1 kHz right.

5.2 Service Modes

Service Default Mode (SDM) and Service Alignment Mode (SAM) offer several features for the service technician, while the Customer Service Menu (CSM) is used for communication between dealer and customer. There is also the option of using ComPair, a hardware interface between a computer (see requirements) and the TV chassis. It offers the ability of structured trouble shooting, error code reading and software version readout for all L01 chassis. Minimum requirements: a 486 processor, Windows 3.1 and a CD-ROM drive (see also paragraph 5.4).

Figure 5-2

5.2.1 Service Default Mode (SDM)

Purpose• To create a predefined setting to get the same

measurement results as given in this manual.• To override SW protections.• To start the blinking LED procedure.

Specifications• Tuning frequency:

– 475.25 MHz for PAL/SECAM (AP-PAL).– 61.25 MHz (channel 3) for NTSC-sets (AP-NTSC).

• C

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