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Philips EM1A Servise Manual

Colour television chassis
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Colour Television

Contents
1. Technical specifications, connection facilities &
chassis overview
2. Safety- and maintenance instructions,
warnings and notes.
3. Directions for use
4. Mechanical instructions
5. Faultfinding and repair tips
6. Block-, wiring diagrams and testpoint overviews
Blockdiagram video processing
Blockdiagram audio & control
Blockdiagram Large Signal Panel: supply
Powerlines overview
Wiring diagram
2
I
C overview
Testpoint overview LSP
Testpoint overview SSB / DW / CRT panel
7. Electrical diagram's en PWB's
Main supply
Standby supply
Line deflection
Frame deflection
Audio amplifier
Headphone amplifier
Tuner, I/O, SIMM-connector
Front control
SSB: SIMM-connector
IF, I/O, videoprocessing
Feature box
HOP
Audio demodulator
Painter
Multi PIP controller
Tuner
I/O processing
©
Copyright 2000 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 CO 0070 Service PaCE
Page
2
4
6
11
15
27
28
29
30
31
32
33
34
Diagram PWB
(Diagram A1) 35
43-48
(Diagram A2) 36
43-48
(Diagram A3) 37
43-48
(Diagram A4) 38
43-48
(Diagram A5) 39
43-48
(Diagram A6) 40
43-48
(Diagram A7) 41
43-48
(Diagram A8) 42
43-48
(Diagram B1) 49
55-60
(Diagram B2) 50
55-60
(Diagram B3) 51
55-60
(Diagram B4) 52
55-60
(Diagram B6) 53
55-60
(Diagram B7) 54
55-60
(Diagram C1) 61
65/66
(Diagram C2) 62
65/66
(Diagram C3) 63
65/66
Printed in the Netherlands
Contents
IF video sync
Side I/O panel
Top control panel
CRT panel
DC-shift panel
Horizontal DAF panel
Vertical DAF panel
Mains switch panel
Mains harmonic panel
8. Alignments
9. Circuit description and
list of abbreviations
10. Spareparts list
Subject to modification
Chassis
EM1A
AA
CL 06532111_000.eps
171000
Page
(Diagram C4) 64
65/66
(Diagram D)
67
67
(Diagram E)
69
69
(Diagram F)
70
71
(Diagram G)
71
71
(Diagram I1)
72
74
(Diagram I2)
73
74
(Diagram J)
75
75
(Diagram Y)
76
76
77
82
96
98
5 3122 785 10850

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Summary of Contents for Philips EM1A

  • Page 1: Colour Television

    (Diagram C3) 63 65/66 © Copyright 2000 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 GB 2 EM1A Technical specifications, connection facilities & chassis overview 1. Technical specifications, connection facilities & chassis overview Technical specifications 1.2.2 Rear connections 1.1.1 Reception Tuning system : PLL 75Ω Colour systems (off-air) : NTSC M (3.58 & 4.43 MHz),...
  • Page 3 Technical specifications, connection facilities & chassis overview EM1A GB 3 Chassis overview CRT/SCAVEM PANEL SIDE I/O PANEL TOP CONTROL PANEL SMALL SIGNAL BOARD MAINS SWITCH PANEL PIP/DOUBLE WINDOW PANEL LARGE SIGNAL PANEL MAINS HARMONIC PANEL DAF PANEL CL 06532130_003.eps 181000...
  • Page 4 GB 4 EM1A Safety & maintenance instructions, warnings and notes 2. Safety & maintenance instructions, warnings and notes Safety instructions for repairs Warnings Safety regulations require that during a repair: • In order to prevent damage to IC's and transistors, all Safety components, indicated by the symbol ∆, should be...
  • Page 5 Safety & maintenance instructions, warnings and notes EM1A GB 5 Notes • The direct voltages and oscillograms should be measured with regard to the tuner earth ( H ), or hot earth ( I ) as this is called. •...

  • Page 6: Directions For Use

    GB 6 EM1A Directions for use 3. Directions for use...
  • Page 7 Directions for use EM1A GB 7...
  • Page 8 GB 8 EM1A Directions for use...
  • Page 9 Directions for use EM1A GB 9...
  • Page 10 GB 10 EM1A Directions for use...

  • Page 11: Mechanical Instructions

    Mechanical instructions EM1A GB 11 4. Mechanical instructions Removing the Rear Cover 1. Remove all the fixation screws of the rear cover. 2. Now the rear cover can be removed by pulling it backward. Service positions 4.2.1 Service position LSP...
  • Page 12 GB 12 EM1A Mechanical instructions 10. Reconnect cables (except degaussing cable 0020), To get access to the test points of the SSB, the shielding has panels and modules. to be removed: Alternative position 2: A somewhat easier way to access the...
  • Page 13 Mechanical instructions EM1A GB 13 4.2.3 Accessing the Double Window (DW) panel 1. The complete module can be removed from the LSP- bracket by pressing its fixation clamp [1] (located behind the PWB), while sliding the module in the direction of the PIP/Double Window CRT [2].
  • Page 14 GB 14 EM1A Mechanical instructions 4.2.8 Accessing the Side I/O panel 1. The complete Side I/O-assembly can easily be removed by unscrewing the 2 fixation screws. 2. The board can easily be lifted out of the bracket after releasing the 2 fixation clamps.
  • Page 15 Test points he is doing as it could lead to damaging the set. The EM1A chassis is equipped with test points in the service After entering SDM, the following screen will be shown with printing. These test points are referring to the functional 'SDM' at the upper right side for recognition.
  • Page 16 GB 16 EM1A Fault finding and repair tips Entering • By the 'ALIGN' button on the DST while the set is in the • Via a standard RC-handset by entering the code normal operation mode. '062596' followed by the 'OSD' button [i+].
  • Page 17 • Activate the selected submenu (e.g. SERV-BLK). Line 3: Software and hardware functionality of the EM1A is Access to normal user menu controlled by option bits. An option byte or option number Pressing the 'MENU' button on the remote control switches represents 8 of those bits.
  • Page 18 PC and the (defective) 3 minutes. product. The ComPair interface box is connected to the PC via a serial or RS232 cable. In case of the EM1A chassis, the Snowy picture ComPair interface box and the TV communicate via a bi- Check CSM line 5.
  • Page 19 SearchMan (Electronic Service Manual) • the rear cover does NOT have to be removed Click on 'File', 'Open' and select 'EM1A fault finding' to use If both ComPair and SearchMan are installed, all the the cable. schematics and the PWBs of the faulty set are available Pre-sets can be installed via menu 'Tools', 'Installation' and 'Pre-sets'.
  • Page 20 GB 20 EM1A Fault finding and repair tips ERROR: 9 6 0 0 0 0 0 : Error code 6 was first detected and error code (and not the actual cause). E.g. a fault in the error code 9 is the last detected (newest) error protection detection circuitry can also lead to a protection.
  • Page 21 Error 18 I/O expander IC M62320P I C communication failure (pos. To get a quick diagnosis the EM1A has 3 service-modes 7403 on the PIP/DW-panel). implemented: • The Customer Service Mode (CSM).

  • Page 22: Repair Tips

    GB 22 EM1A Fault finding and repair tips positioned in ‘Standby’-mode. The Painter will now try to re- start the set. If this will not succeed after 5 times (after ≈ 30 - HFB X-RAY PROTECT X-RAY PROTECT 60 s.), the Painter will generate error 7 (this error can have several causes, such as a Flash, BRIDGE_PROT, DEFL_PROT or a serious mains dip).
  • Page 23 Fault finding and repair tips EM1A GB 23 Standby supply starts oscillating Standby-supply is running; +3.3V, +5V2 ready Low_power_standby 'Standby-info' = high; µP has been reset by POR High_power_standby Degaussing is activated automatically and should be acivated after 12 seconds...
  • Page 24 GB 24 EM1A Fault finding and repair tips • Notice that a very big part of the set (Large Signal Panel) is 'hot', meaning the primary part of the Standby supply, the whole Main supply (except for the secondary Audio supply) and the complete deflection circuit.
  • Page 25 Fault finding and repair tips EM1A GB 25 Phenomenon Possible Cause Repair tip No picture, no LED. Standby Supply defective. Measure circuitry (see diagram A2). Start at test-point P16. Regardless the mode of the set, this voltage should always be available.
  • Page 26 GB 26 EM1A Fault finding and repair tips Personal notes:...
  • Page 27 Alignments EM1A GB 77 8. Alignments Note: The Service Default Mode (SDM) and Service Alignment Mode (SAM) are described in chapter 5. General alignment conditions max. All electrical adjustments should be performed under the CUTOFF following conditions: • Supply voltage: 110 / 220 V (± 10 %); 50 / 60 Hz (± 5 %) 0V Ref.
  • Page 28 GB 78 EM1A Alignments Initial set-up 4. If the frequency showed in the line 'Fine tune' is between 1. Connect an external video pattern generator (PAL BG, 471.18 MHz and 471.31 MHz, you don't need to re-adjust 475.25 MHz) to the aerial input of the TV-set with a the IF-AFC.
  • Page 29 All options of the Adjust the values of BLACK LEVEL R and BLACK EM1A are controlled via 8 option bytes. Select the option LEVEL G to get the right XY-coordinates for Tint = byte (OB1..OB8) and key in the new value.
  • Page 30 OFF = access to Command is ignored / ON = access is processed PITN Philips tuner OFF = ALPS compatible tuner used / ON= Philips compatible tuner used VDBY Virtual Dolby OFF = Virtual Dolby not available / ON = Virtual Dolby is available...
  • Page 31 OFF = access to Command is ignored / ON = access is processed PITN Philips tuner OFF = ALPS compatible tuner used / ON= Philips compatible tuner used VDBY Virtual Dolby OFF = Virtual Dolby not available / ON = Virtual Dolby is available...

  • Page 32: Circuit Descriptions And Abbreviation List

    4. Control & Teletext mounted components on the copper side. Difference with the 5. Tuner & IF MG-chassis is that the EM1A LSP has a very large 'hot' part, 6. Video: High-end Input Processor including the deflection coil. 7. Video: Feature box 8.
  • Page 33 ROM-code and the (optional) DRAM is used for storing the Teletext pages. 375V In the EM1A there is a separate Standby Supply in order to reduce the Standby power consumption. During Standby, the Main Supply is switched off (via TS7529). A relay is used to U out switch the Degaussing circuit.
  • Page 34 CL 96532156_021.eps 250100 Figure 9-4 To apply this on the EM1A (diagram A2): replace Switch 'S' C2104 via D6107 and D6111. All energy that was stored in by FET TS7102, coil L by L5101, diode D by D6107//D6111 L5101 during t0 - t1 will be transferred into the load. Due to and C by C2104.
  • Page 35 Circuit descriptions and abbreviation list EM1A GB 85 Since there are no capacitors and there is a high • After closing switch 'S', the linear in time increasing amplification-factor in the feedback circuit, the feedback is current IT, , will charge capacitor C.
  • Page 36 FET will be longer into conductance, keeping VOUT constant. The software for EM1A can be 192 kB. For TXT-data 100 pages can be stored in IC7011. If, for any reason, the stabilisation circuit might fail, the output The Non Volatile Memory IC7011 is a 4-kb version M24C32.
  • Page 37 (depends on the received standard). In the EM1A-chassis the featurebox is integrated on the SSB. Then the signal is fed to the HIP again (pin 12) where the The PICNIC is used for the 100 Hz conversion. In the PICNIC...
  • Page 38 4. At the same time the fixed beam current is forced via the If EM1A has only 100 Hz, then only one memory-IC is used black current loop for 25 ms. This is done by setting the to store one frame.
  • Page 39 Circuit descriptions and abbreviation list EM1A GB 89 During the 1st frame, 3 pulses are generated to adjust the When no CVBS is offered to the video processor, the VA and cut-off voltage at a current of 8 µA. With this measurement HA pulses are switched off by the HIP, and the VD and HD the black level at the RGB-outputs is adjusted.
  • Page 40 GB 90 EM1A Circuit descriptions and abbreviation list The linearity correction 5430 5430 A constant voltage across the horizontal deflection coil I Defl Defl should result in a linear increasing saw-tooth current. This 141V 141V however is not the case as the resistance of the coil is not t2 t3 negligible.
  • Page 41 Circuit descriptions and abbreviation list EM1A GB 91 flowing in L5422 (1-2). The voltage across the deflection coil The output voltage of the rotation circuit is between -8 and +8 increases, so the picture width increases. When TS7480 blocks, C2421 will not discharge anymore and the voltage across C2421 will remain constant.
  • Page 42 MSP3451 is also able to perform Virtual Dolby, a Dolby approved sound mode for surround sound reproduction with left/right speakers only. Audio processing The sound processing in EM1A is completely done by the MSP3415D for 'Stereo' sets and the MSP3451G for 'Virtual Audio source selection Dolby' sets: MSP3515D (stereo) •...
  • Page 43 Circuit descriptions and abbreviation list EM1A GB 93 The supply voltage is +28 V, generated by the main supply between the two tuners need to be swapped, then the tuner via L5506. RF frequency is swapped. The AV-switching is the same for all regions.
  • Page 44 GB 94 EM1A Circuit descriptions and abbreviation list Block Diagram There is one configuration as shown below. 0205 4 3 1 6 8 9 2 100 DOUBLE WINDOW PROCESSOR IC7801 SAB9081H RF to Main Tuner 7803 TDA8601 TUNER - 7201...
  • Page 45 In order to display the external AV sources by the DW panel, source selection circuit is incorporated on the panel. In EM1A, 4 external AV sources are possible (AV1, AV2/S- VHS1, AV3/S-VHS2 & YUV). The selection between these sources is done by IC7401 HEF4053.
  • Page 46 (1080 lines and 1920 Colour Transient Improvement: horizontal pixels, referred to as manipulates steepness of chroma 1080i) The second HDTV standard, transients 720p x 1280 is not used in EM1A CVBS Composite Video Blanking and chassis (3fH standard not feasible) Synchronisation Headroom...
  • Page 47 VD100 Vertical Drive: vertical sync pulse Large signal panel from deflection Multistandard Sound Processor: ITT Vertical Flyback Pulse: vertical sync sound decoder of EM1A pulse coming from the feature box MUTE Mute-Line Variable Level out: processed audio Not Connected output towards external amplifier...

  • Page 48: Spare Parts List

    GB 98 EM1A Spare parts list 10. Spare parts list [A] Large Signal Panel + [F] CRT 2307 5322 122 32654 22nF 10% 63V 2624 4822 121 51252 470nF 5% 63V 2309 5322 122 32654 22nF 10% 63V 2625 4822 121 51252 470nF 5% 63V...
  • Page 49 Spare parts list EM1A GB 99 3316 4822 117 11148 56k 1% 0.1W 3522 4822 116 83961 6k8 5% 3745 4822 117 11503 220Ω 1% 0.1W 3318 4822 051 20478 4Ω7 5% 0.1W 3523 4822 051 20105 1M 5% 0.1W 3750 4822 117 10834 47k 1% 0.1W...
  • Page 50 GB 100 EM1A Spare parts list 6111 4822 130 83865 SB360 7640 5322 130 60159 BC846B 2302 4822 126 14305 100nF 10% 16V 6120 4822 130 30621 1N4148 7641 5322 130 60159 BC846B 2303 5322 126 11583 10nF 10% 50V...
  • Page 51 Spare parts list EM1A GB 101 2640 4822 126 13879 20nF 20-80% 16V 3351 4822 051 30109 10Ω 5% 0.062W 2651 4822 126 14305 100nF 10% 16V 3352 4822 117 13632 100k 1% 0.62W 2652 4822 122 33777 47pF 5% 63V 3353 4822 051 30102 1k 5% 0.062W...
  • Page 52 GB 102 EM1A Spare parts list 3706 4822 051 30109 10Ω 5% 0.062W 5930 4822 157 11781 Coil BLM11A601SPT1 0201 4822 267 10557 10P 3707 4822 051 30392 3k9 5% 0.063W 5931 4822 157 11781 Coil BLM11A601SPT1 0205 2422 025 16587 10P female V 3708 4822 051 30272 2k7 5% 0.062W...
  • Page 53 Spare parts list EM1A GB 103 2832 4822 126 14043 1µF 20-80% 16V 3384 4822 051 30103 10k 5% 0.062W 3895 4822 051 30471 470Ω 5% 0.062W 2833 4822 126 14305 100nF 10% 16V 3385 4822 051 30472 4k7 5% 0.062W 3896 4822 051 30152 1k5 5% 0.062W...
  • Page 54 GB 104 EM1A Spare parts list [J] Mains Switch Panel 3901 4822 051 20101 100Ω 5% 0.1W Various 3902 4822 116 52201 75Ω 5% 0.5W 3903 4822 051 20101 100Ω 5% 0.1W 0132 4822 276 14024 Power switch 3904 4822 116 52201 75Ω 5% 0.5W...