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Philips Chassis L01.1A AC

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Philips Chassis L01.1A AC Colour Television Chassis L01.1A AC Contents Page Contents Page 1. Technical Specifications, Connections, and 8. Alignments 55 Chassis Overview 2 9. Circuit Description 61 2. Safety and Maintenance Instructions, Warnings, Abbreviation List 70 and Notes 4 IC Data Sheets 71 3. Directions for Use 6 10 Spare Parts List 72 4. Mechanical Instructions 16 11 Revision List 76 5. Service Modes, Error Codes, and Faultfinding 18 6. Block Diagram, I2C, Supply Voltage, and Testpoint Overviews Block Diagram 23 I2C and Supply Voltage Diagram 24 Testpoint Overview Mono Carrier & CRT Panel 25 7. Electrical Diagrams and PWB’s Diagram PWB Power Supply (Diagram A1) 26 41-46 Line Deflection (Diagram A2) 27 41-46 Frame Deflection (Diagram A3) 28 41-46 Tuner IF (Diagram A4) 29 41-46 Video IF + Sound IF (Diagram A5) 30 41-46 Synchronisation (Diagram A6) 31 41-46 Control (Diagram A7) 32 41-46 Audio Amplifier (Diagram A8) 33 41-46 NICAM, 2CS, BTSC Stereo Dec. (Diagram A9) 34 41-46 Audio/Video Source Switching (Diagram A10) 35 41-46 BTSC-NDBX Stereo Decoder (Diagram A11) 36 41-46 Front IO, Front Control and HP (Diagram A12) 37 41-46 Rear IO Cinch (Diagram A13) 38 41-46 Diversity Tables 39 PIP + Tilt Interface (Diagram A16) 40 41-46 CRT Panel: ECO Scavem (Diagram B1) 47 49-50 CRT Panel: ECO Scavem (Diagram B2) 48 49-50 Side AV Panel + Headphone (Diagram C) 51 51 Top Control Panel (Diagram E) 52 52 Degaussing + DAF Panel (Diagram G) 53 53 Front Interface Panel (Diagram Q1) 54 54 ©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. Published by RB 0364 Service PaCE Printed in the Netherlands Subject to modification EN 3122 785 13210 EN 2 1. L01.1A AC Technical Specifications, Connections, and Chassis Overview 1. Technical Specifications, Connections, and Chassis Overview Index: : BI-NICAM B/G, D, D/ 1. Technical Specification K, I 2. Connections A/V connections : NTSC 3.58, 4.43 3. Chassis Overview Channel selections : 100 or 125 channels : UVSH or full cable Note: Aerial input : 75 Ohm • Described specifications are valid for the whole product : IEC- or F-type range (see Product Survey for specific models). • Figures can deviate slightly from the actual situation, due 1.1.2 Miscellaneous to different set executions. Audio output : Stereo: 2 x 1 W or 2 x 1.1 Technical Specifications 3W or 2 x 5W or 2 x 10W : Mono: 1 x 1W or 1 x 1.1.1 Reception 3W or 1 x 4W or 2 x 2W Tuning system : PLL Mains voltage : 90 - 276 V or 150- Colour systems : NTSC 3.58, 4.43 276V : PAL B/G, B/H, D/K, I Mains frequency : 50 / 60 Hz : SECAM B/G, D/K, K1 Ambient temperature : + 5 to + 45 deg. C Sound systems : FM-Stereo Maximum humidity : 90 % : 2CS (B/G, China, Power consumption : 52 W (20") to Korea) : 120 W (36") : 2CS B/G, DK Standby Power consumption : < 3 W : BTSC DBX : NICAM B/G, D, D/K, I 1.2 Connections 1.2.1 Front/Side Connections and Front/Top Control FRONT CONTROL + FRONT I/O TOP CONTROL SIDE I/O INSTALL/MENU P+ V- V+ P- R AUDIO L RED IR R AUDIO L CHANNEL LED CL 36532039_007.eps VIDEO + VOLUME - 240403 Figure 1-1 Front/Side connections and Front/Top control Audio / Video In 3 - Audio R 0.5 Vrms/1 kOhm 1 - Video CVBS 1 Vpp/75 Ohm 2 - Audio L 0.2 Vrms/10 kOhm AV1 YUV In(if present) 3 - Audio R 0.2 Vrms/10 kOhm 1 - Y 0.7 Vpp/75 Ohm 4 - Headphone 8 - 600 Ohm, 4 mW 2 - U 0.7 Vpp/75 Ohm 3 - V 0.7 Vpp/75 Ohm 1.2.2 Rear Connections AV1 In 1 - Video CVBS 1 Vpp/75 Ohm 75 Ohm MONITOR AV1 AV2 2 - Audio L 0.5 Vrms/10 kOhm OUT IN IN 3 - Audio R 0.5 Vrms/10 kOhm V Y V V AV2 In L U L L 1 - Video CVBS 1 Vpp/75 Ohm FM R V R R SVHS 2 - Audio L 0.5 Vrms/10 kOhm CL 16532008_005.eps 3 - Audio R 0.5 Vrms/10 kOhm 120601 AV2 In (SVHS) Figure 1-2 Rear connections 1 - gnd 2 - gnd Monitor Out 3 - Y 1 Vpp/75 Ohm 1 - Video CVBS 1 Vpp/75 Ohm 4 - C 0.3 Vpp/75 Ohm 2 - Audio L 0.5 Vrms/1 kOhm Technical Specifications, Connections, and Chassis Overview L01.1A AC 1. EN 3 1.3 Chassis Overview B1 CRT CRT PANEL B2 SCAVEM TOP CONTROL PANEL E FRONT INTERFACE PANEL SIDE AV PANEL + Q1 C HEADPHONE POWER SUPPLY A1 LINE DEFLECTION A2 FRAME DEFLECTION A3 TUNER IF A4 VIDEO + SOUND IF A5 SYNCHRONISATION A6 MAIN CONTROL (µC) A7 CHASSIS PANEL AUDIO AMPLIFIER A8 NICAM + 2CS + DEGAUSSING & DAF PANEL BTSC DECODER A9 G (34" only) A/V SOURCE SWITCHING A10 BTSC - NDBX DECODER A11 FRONT I/O + FRONT CONTROL + HEADPHONE A12 REAR I/O CINCH A13 TILT INTERFACE A16 CL 36532039_008.eps 010503 Figure 1-3 PWB Location EN 4 2. L01.1A AC Safety & Maintenance Instructions, Warnings, and Notes 2. Safety & Maintenance Instructions, Warnings, and Notes Index of this chapter: 3. Clean the picture tube panel and the neck of the picture 1. Safety Instructions for Repairs tube. 2. Maintenance Instructions 3. Warnings 4. Notes 2.3 Warnings • In order to prevent damage to ICs and transistors, avoid all 2.1 Safety Instructions for Repairs high voltage flashovers. In order to prevent damage to the picture tube, use the method shown in Fig. 2-1, to Safety regulations require that during a repair: discharge the picture tube. Use a high voltage probe and a • Due to the 'hot' parts of this chassis, the set must be multi-meter (position Vdc). Discharge until the meter connected to the AC power via an isolation transformer. reading is 0 V (after approx. 30 s). • 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. V 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) CL96532156_040.eps – fly-back capacitor(s) 140501 – S-correction capacitor(s) – line output transistor Figure 2-1 Discharge picture tube – pins of the connector with wires to the deflection coil – other components through which the deflection current • All ICs and many other semiconductors are susceptible to flows. electrostatic discharges (ESD ). Careless handling Note: This resoldering is advised to prevent bad connections during repair can reduce life drastically. When repairing, due to metal fatigue in solder connections and is therefore only make sure that you are connected with the same potential necessary for television sets more than two years old. as the mass of the set by a wristband with resistance. Keep • Route the wire trees and EHT cable correctly and secure components and tools also at this potential. them with the mounted cable clamps. • Available ESD protection equipment: • Check the insulation of the AC power cord for external – Complete kit ESD3 (small tablemat, wristband, damage. connection box, extension cable, and ground cable) • Check the strain relief of the AC power cord for proper 4822 310 10671. function, to prevent the cord from touching the CRT, hot – Wristband tester 4822 344 13999. components, or heat sinks. • Together with the deflection unit and any multi-pole unit, • Check the electrical DC resistance between the AC plug flat square picture tubes form an integrated unit. The and the secondary side (only for sets that have an isolated deflection and the multi-pole units are set optimally at the power supply). Do this as follows: factory. Adjustment of this unit during repair is therefore not 1. Unplug the AC power cord and connect a wire between recommended. the two pins of the AC plug. • Be careful during measurements in the high voltage 2. Turn on the main power switch (keep the AC power section and on the picture tube. cord unplugged!). • Never replace modules or other components while the unit 3. Measure the resistance value between the pins of the is switched 'on'. AC plug and the metal shielding of the tuner or the • When you align the set, use plastic rather than metal tools. aerial connection of the set. The reading should be This will prevent any short circuits and the danger of a between 4.5 MOhm and 12 MOhm. circuit becoming unstable. 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 2.4 Notes the customer touching any internal parts. 2.4.1 General 2.2 Maintenance Instructions • Measure the voltages and waveforms with regard to the It is recommended to have a maintenance inspection carried chassis (= tuner) ground ( ), or hot ground ( ), depending out by qualified service personnel. The interval depends on the on the area of circuitry being tested. usage conditions: • The voltages and waveforms shown in the diagrams are • When the set is used under normal circumstances, for indicative.
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