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Colour Television
Copyright reserved 1999 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 JvR 9965 Service PaCE
Contents
2. Safety- and maintenance instructions,
Warnings and notes.
5. Service modes, faultfinding and repair tips
6. Faultfinding trees
Supply voltage diagram
Blockdiagram
Testpointsoverview and oscillograms
7. Electrical diagram's en PWB's
Power supply
Diversity table A1
Horizontal deflection
Vertical deflection
Synchronisation
Tuner en video IF (TDA 8844)
Diversity table A5
Video processing
Control
Front control
Smart sound & mono amplifier
Front cinch and headphone
Rear IO Cinches
CRT Panel
Btsc decoder
BTSC Audio amplifier
ITT Audio decodering
ITT Audio amplifier
Side AV panel
9. Circuit description new circuits and
list of abbreviations
10. Spareparts list
Printed in the Netherlands
Page
2
3
4
5
14
15
21
25
26
27
Diagram PWB
(Diagram A1)
28
34/37
29
(Diagram A2)
30
34/37
(Diagram A3)
31
34/37
(Diagram A4)
31
34/37
(Diagram A5)
32
34/37
33
(Diagram A6)
38
34/37
(Diagram A7)
39
34/37
(Diagram A8)
40
34/37
(Diagram A10) 41
34/37
(Diagram A11) 42
34/37
(Diagram A12) 43
34/37
(Diagram B)
44
45
(Diagram C1)
46
48
(Diagram C2)
47
48
(Diagram D1)
49
45
(Diagram D2)
50
45
(Diagram E)
51
51
53
56
61
64
Subject to modification
1
Chassis
L9.2A
AA
CL 96532047_013.eps
270599
5 4822 727 21705
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Table of Contents
Related Manuals for Philips L9.2A
Summary of Contents for Philips L9.2A
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Page 1: Colour Television
10. Spareparts list Copyright reserved 1999 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. -
Page 2: Technical Specifications
GB 2 L9.2A Technical Specifications 1. Technical Specifications Specifications Off air : 100dBV On air : 90dBV Audio output Mains voltage : 150V - 276Vac; • Stereo : 2 * 3W; 2 * 1W Mains frequency : 50 - 60Hz •... - Page 3 Safety instructions, maintenance instruction, warnings and Notes L9.2A GB 3 PCB location drawing SIDE AV PANEL CRT PANEL ITT AUDIO DECODING AUDIO PANEL ITT AUDIO AMPLIFIER MAIN POWER SUPPLY LINE DEFLECTION BTSC DECODER FRAME DEFLECTION AUDIO AMPLIFIER SYNCHRONISATION TUNER VIDEO IF...
- Page 4 GB 4 L9.2A Safety instructions, maintenance instruction, warnings and Notes • Clean the power supply and deflection circuitry on the chassis. • Clean the picture tube panel and the neck of the picture tube. Warnings 1. ESD w 2. All ICs and many other semiconductors are susceptible to electrostatic discharges (ESD).
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Page 5: Directions For Use
Directions for use L9.2A GB 5 3. Directions for use... - Page 6 GB 6 L9.2A Directions for use...
- Page 7 Directions for use L9.2A GB 7...
- Page 8 GB 8 L9.2A Directions for use...
- Page 9 Directions for use L9.2A GB 9...
- Page 10 GB 10 L9.2A Directions for use...
- Page 11 Directions for use L9.2A GB 11...
- Page 12 GB 12 L9.2A Directions for use...
- Page 13 Directions for use L9.2A GB 13...
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Page 14: Mechanical Instructions
GB 14 L9.2A Mechanical instructions 4. Mechanical instructions Service positions The mono-carrier is removed by pushing the two centre clips at both chassis brackets outwards and pulling the panel forward. See figure 4.2 for the service position. Disconnect the connecting cable feeding the right-hand and the left-hand speaker, also disconnect the degaussing cable. - Page 15 Service Modes, fault finding and repair tips L9.2A GB 15 DST are recommended (For the L9 chassis, download code X Access to SAM should be used). By pressing the "CHANNEL DOWN" and "VOLUME DOWN" buttons on the local keyboard simultaneously or pressing "ALIGN"...
- Page 16 GB 16 L9.2A Service Modes, fault finding and repair tips • By pressing the "CHANNEL DOWN" and "VOLUME contrast ) while "SAM" remains displayed in top of screen. DOWN" key on the local keyboard simultaneously when Pressing the "MENU" key again will return to the last SAM the set is in SDM status.
- Page 17 Service Modes, fault finding and repair tips L9.2A GB 17 The menus and submenus Error code buffer and error codes 5.3.1 Tuner sub menu 5.4.1 Error code buffer The tuner sub menu contains the following items: The error code buffer contains all errors detected since the last •...
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Page 18: Trouble Shooting Tips
Error 10 = I2C error EEPROM . NV memory (EEPROM) does not respond to the micro controller To trouble shoot the L9.2A SMPS, first check the Vaux voltage Error 11 = I2C error PLL tuner. Tuner is corrupted or the on C2561. - Page 19 • ComPair helps you to quickly get an understanding how to • Emulation of the Dealer Service Tool repair the L9.2A in short time by guiding you step by step through the repair procedures. 5.7.2 SearchMan (Electronic Service Manual) •...
- Page 20 – the rearcover has to be removed Switch the ComPair interface OFF Click on "File" "Open" and select "L9.2A fault finding" to use the cable Switch the television set OFF with the mains switch Presets can be installed via menu "Tools", "Installation", "Presets".
- Page 21 Alignments L9.2A GB 53 8. Alignments General: the Service Default Mode (SDM) and Service • The alignment of the VG2 has been completed; Switch the Alignment Mode (SAM) are described in chapter 5. set to Standby. The values adapted at the BRIGHTNESS- and the CONTRAST-menu during the alignment, will change back again to their default values.
- Page 22 GB 54 L9.2A Alignments To go back to the main SAM-menu , press the MENU key on 8.3.5 White tone the RC. To leave the SAM-menu and store the alignments in the NVN, • Connect a pattern generator (e.g. PM5418) and set it to press the STANDBY-key on the RC.
- Page 23 ED = Europe Tri Mono EF = Europe Full Multi EL = Europe Full Multi with LL’ Tuner (OFF: Philips tuner; ON: Alps tuner) Default value = OFF Channel Select Time Window (OFF: 2 seconds; ON: 5 Time interval for entering a second digit for channel selection...
- Page 24 GB 56 L9.2A Circuit description new circuits External Source Colour Select External source colour selection available when enabled External 1 External 1 source input available when enabled (*) Remark: When option RC = OFF, the P+ and the P- key on OB3 bits 8, 7, ..., 1: RC, WE, (res), (res), TW, AC, C8, VM...
- Page 25 Circuit description new circuits L9.2A GB 57 of this paragraph. This cycle will repeat itself and can be too high which is detected by pin 7. As a result the primary noticed by an audible hick-up sounding noise. current is limited to its maximum value and the secondary •...
- Page 26 GB 58 L9.2A Circuit description new circuits • 2CS : FM STEREO / FM MONO ( all standards 4.5, 5.5, 6.5 MHz ) • BTSC : MONO/STEREO/STEREO-AP 7953/7954 7803 7250-A LEFT OUT RIGHT OUT MONO/AV STEREO, BTSC DBX incorporating 2CS (two...
- Page 27 Circuit description new circuits L9.2A GB 59 9.5.2 Tuner 9.5.5 IF- amplifier The PLL tuner (item 1000) is digitally controlled via the I2C- The IF-amplifier incorporates symmetrical inputs (pins 48 and bus. The tuner is suitable to receive off-air, S-(cable) and hyper 49).
- Page 28 GB 60 L9.2A Circuit description new circuits IC 7250-4A 7250-4B TDA 8845 TDA 8844/45 Y (TO SYNC PART) LUM. DELAY PEAKING VIDEO- CORING IF AMPLIFIER VIDEO BASE- INPUT SELECT AMPL. BAND PLL VIDEO DEMO. Y + CHROMA OUTPUT PROCESSING BASE-...
- Page 29 Circuit description new circuits L9.2A GB 61 9.6.6 Second RGB insertion CRT_discharge signal. The level of this signal is only high during the time the set is switched off. And id due to the cathodes of the CRT are driven fully negative. That means that Pins 23, 24, 25 are used as the inputs for the second R, G, B the beam current is increased.
- Page 30 GB 62 L9.2A Circuit description new circuits EEPROM Electrically Erasable Programmable KeyBd3 Local keyboard control signal to micro Read Only Memory (also called NVM; controller non-volatile memory) Power amplifier output to headphone EHT-INFO Extra high tension information; Beam and speaker...
- Page 31 Circuit description new circuits L9.2A GB 63 RGB_Blanking Red Green Blue Blanking signal (combined with AV_MUTE) RightOut Audio right signal output R_TXT_OSD Red TXT or OSD signal from uC to the video controller IC7250 (BIMOS) Read Only Memory Service Alignment Mode. Service...
- Page 32 GB 64 L9.2A Spare parts list 10. Spare parts list Mono Carrier [A] 2222 4822 126 13838 100nF 20% 50V 2531 4822 126 14587 560pF 2% 50V 2223 4822 126 13751 47nF 10% 63V 2533 5322 122 31863 330pF 5% 63V...
- Page 33 Spare parts list L9.2A GB 65 3152 4822 117 10834 47k 1% 0.1W 3424 4822 117 11507 6k8 1% 0.1W 3641 4822 117 12521 68Ω 1% 0.1W 3153 4822 050 11002 1k 1% 0.4W 3425 4822 051 20101 100Ω 5% 0.1W 3642 4822 117 12521 68Ω...
- Page 34 GB 66 L9.2A Spare parts list 6401 4822 130 30621 1N4148 0248 4822 267 31673 HEADPHONE PLUG 6402 4822 130 42488 BYD33D CRT[B] 1801 4822 242 10769 crystal 18.432MHz 6404 4822 130 32896 BYD33M 6405 4822 130 42488 BYD33D Various...
- Page 35 Spare parts list L9.2A GB 67 0251 4822 267 31673 HEADPHONE PLUG 0253 4822 267 31673 HEADPHONE PLUG 2171 4822 126 13512 330pF 10% 50V 2172 4822 126 13512 330pF 10% 50V 3150 4822 116 83884 47k 5% 0.5W 3151 4822 050 11002 1k 1% 0.4W...