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Colour Television
ServiceManual
5
Subject to modification
without the prior permision of Philips.
Copyright reserved 1998 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
Printed in The Netherlands
Published by LV 9864 TV Service Department
©
Copyright reserved 1998 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, electron-
ic, mechanical, photocopying, or otherwise without the prior permision of Philips.
Published by LV 9864 TV Service Department
Content
1
2
3
and Notes
4
5
6
Diagram supply voltages survey
7
Electrical Diagrams and print lay-outs
8
9
10 Directions for use (limited)
11 List of abbreviations
12 Spareparts list
4822 727 21566
Printed in The Netherlands
2
3
4
6
7
12
13
14
Diagram PWB
16
17
16
18
diagram A2
19
18
diagram A3
20
18
diagram A4
21
18
diagram A5
22
18
23
18
diagram A7
24
18
diagram A8
25
18
26
diagram B
27
26
diagram C
28
26
29
31
38
46
47
Subject to modification
1
Chassis
L7.3A
AA
CL 86532010_001.ai
160298
5 4822 727 21566
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Table of Contents
Related Manuals for Philips L7.3A
Summary of Contents for Philips L7.3A
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Page 1: Table Of Contents
Copyright reserved 1998 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... -
Page 2: Technical Specifications
Technical specifications L7.3A Mains Voltage: : 150 - 276 Volt Technical specifications : 90 - 276 Volt Mains frequency : 50 Hz : 60 Hz Power Consumption in stand-by : < 10 Watt Power Consumption normal mode : 25” : 75Watt +/- 10% : 29”... -
Page 3: Connection Facilities, Location Of Panels
Connection facilities L7.3A Connection facilities VIDEO 2 VIDEO 1 VIDEO VIDEO ANTENNA AUDIO AUDIO CL 86532010_003.ai 160298 Volume Channel CL 86532010_004.ai 160298 Cinch Head phone - Video 1Vpp/75Ω (8 - 600Ω / 4mW) L(0.5Vrms ≥10kΩ) - Audio R(0.5Vrms ≥10kΩ) - Audio... -
Page 4: Safety Instructions, Warnings
Safety instructions, Maintenance instruction, L7.3A Safety instructions for repairs – When the set is used in circumstances with higher dust, Safety instructions, Maintenance instruction, Warnings and Notes grease or moisture levels, for example in a kitchen, the recommended interval is 1 year. - Page 5 Safety instructions, Maintenance instruction, L7.3A 3. Where necessary, the oscillograms and direct voltages are measured with and without aerial signal. Voltages in the power supply section are measured both for normal operation and in standby . These values are indicated by means of the appropriate symbols (see fig.
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Page 6: Mechanical Instructions
Mechanical instructions L7.3A For the service position of the main carrier see figure 4.1: Mechanical instructions The main carrier can be removed by releasing the 2 carrier blocking lips (1) and pulling the carrier panel backwards. CL 86532010_002.ai 160298 Figure 4-1... -
Page 7: Repair Facilities
Faultfinding tree & Repair facilities L7.3A Faultfinding tree & Repair facilities... - Page 8 Faultfinding tree & Repair facilities L7.3A Repair facilities To leave the Service mode press the stand-by button on the remote control. Functional blocks REMARKS : After switching off and on the mains switch, the set remains in the service mode (SDM- or SAM mode).
- Page 9 Faultfinding tree & Repair facilities L7.3A 5.5.4 Error code indication via blinking stand by LED AS (options VALUE 8888 7777 66 description) (options bytes) The ERROR code are also indication via blinking of the standby LED. This is important if no OSD function or picture is...
- Page 10 Faultfinding tree & Repair facilities L7.3A indication in hexadecimal form of the options settings of the 4 : 3 Expend ON/OFF relevant set. Games ON/OFF SAM (Service Alignment Mode) Hospital mode ON/OFF This menu is being displayed whenever SAM is entered.
- Page 11 Faultfinding tree & Repair facilities L7.3A DELTA WARM TEMPERATURE SUB MENU • DELTA WARM RED • DELTA WARM GREEN • DELTA WARM BLUE 5.6.3 White tone 5.6.4 GEOMETRY The white tone menu contains the following information : The geometry menu contains the following information :...
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Page 12: Software Adjustments And Hotel Mode
Faultfinding tree & Repair facilities L7.3A All changed data will be stored into the EEPROM after if the screen is not working properly. The method is to use the returning to the service main menu via the OK key LED pulses with as many pulses as the error number, followed by a time period of 3 seconds in which the LED is off. -
Page 13: Block Diagram
Block diagram L7.3A Block diagram CONTROL CINCH CINCH BTSC DECODING SOUND PROCESSING CONNECTIONS CONNECTIONS SOUND AMPLIFIER CVBS_EXT1 L OUT A4-31 A6-1 M 11 7114 7118 VIDEO-IN1 +5 VD + 8D R OUT (A4 - 14) LEFT OUT A6-2 CHROMA-O/NTSC-SW MOD_L_IN1... -
Page 14: Survey Of Testpoints
Block diagram L7.3A C1 5.0V DC 1.6V DC 8V1 DC MAINS SUPPLY LINE DRIVE 0V6 DC 4.0V DC CRT DISCHARGE CIRCUIT Vbatt 3548 6542 6543 3543 5.0V DC 5V DC 6502/05 5545 2541 SYNC-FRAME 5500 DISCHARGE SK 1 5574 & VERT. DRIVE... - Page 15 Block diagram L7.3A C1 5.0V DC 1.6V DC 8V1 DC 2116 0V6 DC 4.0V DC 2622 5.0V DC 5V DC 2621 0.5V / div AC I5 0.5 - 30V DC 5V / div DC 5V DC 500mV / div AC 2115 0.1ms / div...
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Page 16: Main Pwb Layout
Diagrams and print lay-outs L7.3A Diagrams and print lay-outs... -
Page 17: Power Supply
Diagrams and print lay-outs L7.3A M1 B2 M1 B2 5500 B4 M2 A2 M2 A2 5502 B4 SK1 B2 SK1 B2 5515 G3 POWER SUPPLY 1080 A5 1080 A5 5516 B7 1500 B3 1500 B3 5518 C7 1572 C8 1572 C8... -
Page 18: Main Pwb Layout
Diagrams and print lay-outs L7.3A... -
Page 19: Line Drive
Diagrams and print lay-outs L7.3A M5 B5 6487 F8 M60 G11 6488 C7 2448 E7 6489 C9 LINE-DRIVE 2450 B4 6490 E7 2451 B5 7460 E3 2456 F1 7461 G2 2457 D6 7470 G3 DIVERSITY TABLE FOR ALL ITEM NO. MARKED WITH *... -
Page 20: Sync-Frame & Vertical Drive
Diagrams and print lay-outs L7.3A M4 F11 2401 E8 2402 F9 2403 E9 SYNC/FRAME/VERTICAL DRIVE 2404 E10 2404 F9 2405 F7 2407 F7 2408 G10 2420 C6 2422 B5 2425 D5 2426 D5 2427 C4 2428 C5 2429 C4 SYNC... -
Page 21: Video Processing
Diagrams and print lay-outs L7.3A M7 D9 3223 E5 1000 F3 3224 E5 1015 G7 3225 D8 VIDEO PROCESSING (BIMOS-IC) 1206 D10 3227 D7 PAL/NTSC/SECAM PROCESSING 1207 D10 3229 D8 1208 E10 3234 F9 1209 F11 3248 A7 1275 C3... -
Page 22: Control
Diagrams and print lay-outs L7.3A GND H2 3641 D3 M24 A10 3642 D3 M25 A10 3650 G2 M28 G5 3651 E1 CONTROL M29 G5 3653 G3 1600 E2 3654 D4 1601 E2 3655 D4 * Ref Des VST Tuning PLL Tuning... -
Page 23: Sound Processing
Diagrams and print lay-outs L7.3A M9 D1 7113 C4 M11 A1 7114 D4 M16 G11 7115 A4 0191 G10 7117 C4 SOUND PROCESSING + SOUND INTERFACE 1102 G3 7118 D5 1104 G3 7225-B G4 1110 G9 9100 G2 1111 H9... -
Page 24: Sound Amplifier
Diagrams and print lay-outs L7.3A M90 A9 4323 C2 2308 C3 5300 E7 2310 C4 6300 B7 2312 D4 6301 B7 SOUND AMPLIFIER 2314 B5 7305 C3 2315 B8 7306 D3 2316 C8 7308 B5 2317 C8 7310 D3 VOLUME... -
Page 25: Btsc Decoding
Diagrams and print lay-outs L7.3A 1300 C6 2359 C5 2360 B5 2361 C5 2361 C5 BTSC DECODING 2362 C5 2363 C7 2364 C7 2365 E5 2366 E5 2367 E5 2368 E5 2369 E6 2370 E6 2371 E6 2372 E6 2373 E6... -
Page 26: Crt Pwb/ Audio Sound Pwb
Diagrams and print lay-outs L7.3A... -
Page 27: Crt Module
Diagrams and print lay-outs L7.3A C7 E2 C60 F2 C81 A8 C83 B7 CRT PANEL C84 B7 2830 A5 V15a 2840 G5 2841 D6 2843 F6 2844 G2 AQUADAG 2845 F6 WIRE 3831 B5 +200VA +200V 3832 B6 3833 B5... -
Page 28: Nicam Sound Panel
Diagrams and print lay-outs L7.3A C2 F3 C3 D3 1204 C7 2210 C9 NICAM PANEL 2211 F7 2212 E7 2213 C7 2214 C8 2215 C7 2216 E7 2217 E8 2220 D7 +8VA 2221 D8 2222 D8 3247 5203 2223 D9... -
Page 29: Electrical Adjustments
Electrical adjustments L7.3A Notes : Enter SAM mode by Dealer Service Tool or short-circuit service Electrical adjustments Unless stated otherwise, the supply voltage used is : pins M28 and M29 on PCB and switch power ON. The menu is displayed whenever SAM mode is entered. Enter into TUNER –... - Page 30 Electrical adjustments L7.3A 8.2.2 White-D adjustment (software adjustment) NOTE: ALL VALUES ARE RECOMMENDED NOMINAL VALUES. Connect a pattern generator (e.g. PM5418) and set it to white 8.3.2 2CS/NICAM Sound adjustment (software adjustment) raster pattern. Enter SAM by using the Dealer Service Tool or short-circuit Set generator (e.g.
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Page 31: Circuit Descriptions New Circuits
Circuit description new circuits L7.3A Power supply (diagram A1) diodes (D6550, D6560 and D6570,D6590). The current Circuit description new circuits through the secondary side of the transformer decreases with a linear slope of T5545. Introduction • During T-dead FET 7518 does not conduct and no energy is extracted from the mains of supplied side, this gives 9.1.1... - Page 32 Circuit description new circuits L7.3A adjustable by 3572. For the information at pin 14 of IC7520 balance off feedback voltage Vpin 14 and the internal 2V5 controls each portion of energy transferred to the secondary reference voltage, at a new smaller duty cycle. As a result of...
- Page 33 Circuit description new circuits L7.3A The safety resistor R3525 limits the drive current to the gate of detected by IC7520 via I-prim and secondary output voltages FET 7518. In a stable situation Vpin 14 is typical 2V4. sensing. In case the load decreases below a certain threshold the SMPS will switch in "reduced frequency mode"...
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Page 34: Diagram A6
Circuit description new circuits L7.3A SINGLE CHIP PROCESSOR IC7225 (=TDA8374) 9.6.2 PAL/NTSC Processing (IC7225-5B, see diagram A6) IC7225-5B contains : source selector and PAL/NTSC colour Introduction : decoder. In this chip most of the video, audio and sync circuits are... - Page 35 Circuit description new circuits L7.3A 9.6.3 Video controller (IC7225-5C, see diagram A4) • In case of no TXT another (C is used with less pins. This uC is indicated in the diagrams with the internal pin numbering. The main functions are : In the description below, the pin numbers are the numbers –...
- Page 36 Circuit description new circuits L7.3A • X-ray protection. If the EHT will become too high, the tube present; the sandcastle pulse is applied to several parts of the will radiate too much X-ray, this is detected by monitoring circuits for timing purposes.
- Page 37 Circuit description new circuits L7.3A – STEREO & SAP information to adjust different sound sources (eg Terrestric/SAT channels, – STEREO: {MONO C -> 1/2(L+R) and STEREO SC-> 1/ SCART) to equal volume level. The increased volume of 2(L-R)} and SAP:{second audio channel} advertising is compensated as well.
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Page 38: Connecting Peripheral Equipment
Connecting peripheral equipment The TV’s controls Equipment such as VCR, Laser disc player, VCD etc. could be connected to the video and audio (AV) sockets at the back of the TV. Switch off the TV For 25PT models and equipment before making any connection. Connection for playback ˝... - Page 39 10 Direction for use L7.3A...
- Page 40 Menus Installing the TV 1st level 2nd level 3rd level Selecting the menu language BRIGHTNESS MENU 1. Call up 1st level menu with the COLOUR key. CHILD LOCK CONTRAST SURF A/CH INSTALLATION SHARPNESS FROM CODE – – – – 2. Scroll up with the key to highlight BRIGHTNESS CHANNEL...
- Page 41 …installing the tv …installing the tv Manual How to deal with poor picture reception This menu enables you to search and store CHILD LOCK You can use these 3 ways to deal with poor picture reception of your TV every available channel manually. SURF A/CH •...
- Page 42 Sound settings …installing the tv System selection Personal settings SWAP For multi system sets: You can do adjustment on VOLUME, BALANCE, TREBLE and BASS of a SKIP This feature enables you to select either picture via the 1st level menu. Adjustment on treble and bass will auto- MANUAL PAL-BG, PAL-I, PAL-DK, SECAM-DK, NTSC matically be stored in the PERSONAL mode of the SMART SOUND feature.
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Page 43: Other Features
Other features …sound settings Sleeptimer AVL-Auto Volume Leveller Sets timer to switch TV to standby in steps of 15 minutes to a maximum of This feature if switched on will automatically adjust any sudden changes in 120 minutes. To disable timer, set to “OFF”. the TV’s volume to a preset level. - Page 44 10 Direction for use L7.3A...
- Page 45 10 Direction for use L7.3A...
- Page 46 11 Abbreviations L7.3A (R-Y)_OUT R-Y output from chroma demodulator Random Access Memory Abbreviations Microcomputer RESET1 Reset signal for the uC AQUA Aquadaq layer on the outside of the picture RF_AGC Automatic gain control signal I for tuner tube RIGHT_OUT Audio right ou...
- Page 47 12 Spareparts list L7.3A 4822 126 13473 µF 220nF 80-20% 4822 126 13061 µF 220nF 20% 25V Mainpanel Spareparts list 2349 2684 5471 4822 157 11547 1000µH 10% 8X10 5480 5322 157 51687 FXDIND A 04 39µH 4822 126 13482 µF 470nF 80/20%...
- Page 48 12 Spareparts list L7.3A 7520 4822 209 15684 MC44603AP 7541 4822 209 15829 TDA8139 7542 5322 130 60508 BC857B 7570 4822 209 81397 TL431CLPST 7581∆ 4822 209 71634 TCDT1101G 7600 4822 209 15831 P87C766BDR/01 7600 4822 209 16308 P87C770AAR/40 7600...