PHILIPS L01.1L Service Manual

Colour Television Chassis

L01.1L

Contents Page Contents Page

1. Technical Specifications, Connections, and Chassis Overview 2

2. Safety and Maintenance Instructions, Warnings, and Notes 4

3. Directions for Use 6

4. Mechanical Instructions 18

5. Service Modes, Error Codes, and Faultfinding 20

6. Block Diagram, I

Testpoint Overviews

Block Diagram 25

C and Supply Voltage Diagram 26

Testpoint Overview Mono Carrier & CRT Panel 27

7. Electrical Diagrams and PWB’s Diagram CBA Power Supply (Diagram A1) 28 43-48 Line Deflection (Diagram A2) 29 43-48 Frame Deflection (Diagram A3) 30 43-48 Tuner IF (Diagram A4) 31 43-48 Video IF + Sound IF (Diagram A5) 32 43-48 Synchronisation (Diagram A6) 33 43-48 Control (Diagram A7) 34 43-48 Audio Amplifier (Diagram A8) 35 43-48 NICAM, 2CS, BTSC Stereo Dec.(Diagram A9) 36 43-48 Audio/Video Source Switch (Diagram A10) 37 43-48 BTSC-NDBX Stereo Decoder (Diagram A11) 38 43-48 Front IO, Front Control and HP (Diagram A12) 39 43-48 Rear IO Cinch (Diagram A13) 40 43-48 PIP + Tilt Interface (Diagram A16) 42 43-48 Diversity Tables 41 CRT Panel: ECO Scavem (Diagram B1) 49 51-52 CRT Panel: ECO Scavem (Diagram B2) 50 51-52 Side AV Panel + Headphone (Diagram C) 53 53 Side AV Panel + HP (SLIM) (Diagram C1) 54 55 Side AV Panel + HP (WIDE) (Diagram C2) 56 57 Top Control Panel (Diagram E) 58 58

Copyright 2003 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.

C, Supply Voltage, and

Matrix Surround Panel (Diagram M) 59 59 Top Control Panel (Diagram T) 60 61 Front Interface Panel (Diagram Q1) 62 62 DAF Panel + Inner Pin Cushion Correction (Diagram W) 63 63

8. Alignments 65

9. Circuit Description 71 Abbreviation List 80 IC Data Sheets 81

10 Spare Parts List (not applicable yet) 82 11 Revision List 83

Published by RB 0363 Service PaCE Printed in the Netherlands Subject to modification EN 3122 785 13230

EN 2 L01.1L AC1.

Technical Specifications, Connections, and Chassis Overview

1. Technical Specifications, Connections, and Chassis Overview

1.1 Technical Specifications

1.1.1 Reception

Tuning system : PLL Colour systems : NTSC M

: PAL M : PAL N

Sound systems : FM-mono

: BTSC + SAP

: BTSC non-DBX A/V connections : PAL B/G (pb) Channel selections : 181 channels

: Full cable IF frequency : 45.75 MHz

1.2 Connections

1.2.1 Front/Side Connections and Front/Top Control

FRONT CONTROL + FRONT I/O

INSTALL/MENU

RED

LED

VIDEO

R AUDIO L

+ VOLUME -

CHANNEL

Aerial input : 75 Ohm

:F-type

1.1.2 Miscellaneous

Audio output : 2 x 5 W or

: 2 x 10 W

Mains voltage : 90 - 276 V (± 10 %) Mains frequency : 50 / 60 Hz (± 5 %) Ambient temperature : + 5 to + 45 deg. C Maximum humidity : 90 % RH Power consumption : 52 W (20") to

: 120 W (36")

Standby Power consumption : 1 W

TOP CONTROL SIDE I/O

P+

V+ ORV-

P-

VOLUME-+-+PROGRAM

R AUDIO L

CL 26532119_053.eps

181202

Figure 1-1 Front/Side connections and Front/Top control

Audio / Video In

1 - Video CVBS 1 Vpp/75 Ohm  2 - Audio L 0.2 Vrms/10 kOhm  3 - Audio R 0.2 Vrms/10 kOhm  4 - Headphone 8 - 600 Ohm, 4 mW 

1.2.2 Rear Connections

75 Ohm

MONITOR

OUT

AV1

R SVHS

Figure 1-2 Rear connections

Monitor Out

1 - Video CVBS 1 Vpp/75 Ohm  2 - Audio L 0.5 Vrms/1 kOhm  3 - Audio R 0.5 Vrms/1 kOhm 

AV1 YUV In(if present)

1 - Y 0.7 Vpp/75 Ohm  2 - U 0.7 Vpp/75 Ohm  3 - V 0.7 Vpp/75 Ohm 

AV2

CL 16532008_005.eps

AV2 In

1 - Video CVBS 1 Vpp/75 Ohm  2 - Audio L 0.5 Vrms/10 kOhm  3 - Audio R 0.5 Vrms/10 kOhm 

AV2 In (SVHS)

1 - gnd  2 - gnd  3 - Y 1 Vpp/75 Ohm  4 - C 0.3 Vpp/75 Ohm 

120601

AV1 In

1 - Video CVBS 1 Vpp/75 Ohm  2 - Audio L 0.5 Vrms/10 kOhm  3 - Audio R 0.5 Vrms/10 kOhm 

Technical Specifications, Connections, and Chassis Overview

1.3 Chassis Overview

CRT

B1 B2

C C1 C2

SCAVEM

"SLIM"

"WIDE"

MATRIX SURROUND PANEL

DAF PANEL

CRT PANEL

SIDE AV PANEL +

HEADPHONE

MAIN

CHASSIS

PANEL

TOP CONTROL PANEL

FRONT INTERFACE PANEL

POWER SUPPLY

LINE DEFLECTION

FRAME DEFLECTION

TUNER IF

VIDEO + SOUND IF

SYNCHRONISATION

CONTROL (µC)

AUDIO AMPLIFIER

NICAM + 2CS + BTSC DECODER

A/V SOURCE SWITCHING

BTSC - NDBX DECODER

FRONT I/O + FRONT CONTROL + HEADPHONE

REAR I/O CINCH

TILT INTERFACE

EN 3L01.1L AC 1.

E T

A1 A2 A3 A4 A5 A6 A7 A8

A9 A10 A11 A12 A13 A16

Figure 1-3 PWB Location

CL 36532118_004.eps

140303

EN 4 L01.1L AC2.

Safety & Maintenance Instructions, Warnings, and Notes

2. Safety & Maintenance Instructions, Warnings, and Notes

Index of this chapter:

1. Safety Instructions for Repairs

2. Maintenance Instructions

3. Warnings

4. 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 resolder 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 resoldering 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 MOhm and 12 MOhm.

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).

CL96532156_040.eps

Figure 2-1 Discharge picture tube

• 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

2.4.1 General

• 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 “Service Modes, Error Codes, and Faultfinding” section) with a color bar signal and stereo sound (L: 3 kHz, R: 1 kHz unless stated otherwise) and picture carrier at 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.

140501

Safety & Maintenance Instructions, Warnings, and Notes

• 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.

2.4.2 Schematic Notes

• All Resistor values are in ohms and the value multiplier is often used to indicate the decimal point location (e.g. 2K2 indicates 2.2 kOhm).

• Resistor values with no multiplier may be indicated with either an 'E' or an 'R' (e.g. 220E or 220R indicates 220 Ohm).

• All Capacitor values are expressed in Micro-Farads (µ =

-6

x10

), Nano-Farads (n = x10-9), or Pico-Farads

-12

(p = x10

• Capacitor values may also use the value multiplier as the decimal point indication (e.g. 2p2 indicates 2.2 pF).

• An 'asterisk' (*) indicates component usage varies. Refer to the diversity tables for the correct values.

• The correct component values are listed in the Electrical Replacement Parts List. Therefore, always check this list when there is any doubt.

EN 5L01.1L AC 2.

2.4.3 Practical Service Precautions

• It makes sense to avoid exposure to electrical shock. While some sources are expected to have a possible dangerous impact, others of quite high potential are of limited current and are sometimes held in less regard.

• Always respect voltages. While some may not be dangerous in themselves, they can cause unexpected reactions - reactions that are best avoided. Before reaching into a powered TV set, it is best to test the high voltage insulation. It is easy to do, and is a good service precaution.

• Before powering up the TV set with the back cover off (or on a test fixture), attach a clip lead to the CRT DAG ground and to a screwdriver blade that has a well insulated handle. After the TV is powered on and high voltage has developed, probe the anode lead with the blade, starting at the case of the High Voltage Transformer (flyback - IFT). Move the blade to within two inches of the connector of the CRT. If there is an arc, you found it the easy way, without getting a shock! If there is an arc to the screwdriver blade, replace the part which is causing the problem; the High Voltage Transformer or the lead (if it is removable).