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Colour Television
Module
LGE PDP 2K6
PDP42X3*
Contents
Page
1. Technical Specifications, Connections, and Chassis Overview 2 2. Safety Instructions, Warnings, and Notes 5 3. Directions for Use 6 4. Mechanical Instructions 7 5. Service Modes, Error Codes, and Fault Finding 12 6. Block Diagrams, Test Point Overviews, and Waveforms 25 7. Circuit Diagrams and PWB Layouts 25 8. Alignments 26 9. Circuit Descriptions, Abbreviation List, and IC Data Sheets 29 10. Spare Parts List 34 11. Revision List 34
© Copyright 2007 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 MW 0765 BG CD Customer Service
Printed in the Netherlands
Subject to modification
EN 3122 785 16392
EN 2
1.
LGE PDP 2K6
Technical Specifications, Connections, and Chassis Overview
1. Technical Specifications, Connections, and Chassis Overview
Index of this chapter: 1.1 Technical Specifications PDP42X3* 1.1.1 General Specification 1.1.2 Definitions 1.1.3 Chassis Overview
1.1
Technical Specifications PDP42X3*
The PDP Module is divided into a Panel part and a Drive part. The Panel part consists of Electrodes, Phosphor, various dielectrics, and gas, while the Drive part includes electronic circuitry and PWBs.
1.1.1
General Specification Table 1-1 General Specifications Model Name Number Of Pixels (H x V) Pixel Pitch (H x V µm) Cell Pitch (H x V µm) Display Area (H x V mm) Outline Dimension (H x V x D mm) Colour Arrangement Number Of Colours (R x G x B) Weight Aspect Ratio Peak Brightness Contrast Ratio Power Consumption Lifetime 1024 (*3) x 768 900 x 676 300 x 676 (base: Green Cell) 921.6 x 519.2 ± 0.5 1005 x 597 x 61.2 ± 1 RGB closed type 1024 x 1024 x 1024 (1,073,741,824) 15.3 ± 0.5 kg 16 : 9 Typical 1200 cd/m2 (1 % white window) Average 140 : 1 (Light room 100 Lx at centre) Typical 10000 : 1 (Dark room 1 % white window, white window pattern at centre) Max. 330 W (Full White) Over 60,000 hours (initial brightness 1/2) 1. 2. 3. 4. 5. 6. 7. Model name. Bar code (Code 128, contains the manufacture no.). Manufacture no. (Module serial no.). The trade name of LG Electronics. Manufacture date (Year & Month). The place of origin. Model suffix. PDP42X3*
1.1.2
Definitions
* Rear side of m odule
E xhaus t h o le
lo n g 1
s h o rt 1 lo n g 2 s h o rt 2
TC P long 2-1
········
T C P lo n g 2 - 2 2
G_16390_001.eps 290607
Figure 1-1 Definition of module position
V s e tu p
1
-V y
V sc
V zb
G_16391_001.eps 290607
2 3 7
Figure 1-3 Voltage label (on rear side of module)
4
5
6
G_16390_002.eps 020806
Figure 1-2 Identification label
Technical Specifications, Connections, and Chassis Overview
LGE PDP 2K6
1.
EN 3
PCB PART NO.
G_16390_008.eps 040806
Figure 1-4 Part number printing (on board)
BOARD ASSY PART NR. BOARD NAME BOARD SERIAL NR.
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Figure 1-5 Part number label (on board)
TCP SERIAL NO.
G_16390_007.eps 030806
Figure 1-6 TCP serial number (on TCP)
EN 4
1.1.3
1.
LGE PDP 2K6
Technical Specifications, Connections, and Chassis Overview
Chassis Overview
PSU
3501Q00203B
Y Driver Board
Y Sus Board
Z Sus Board
Control Board
X Left Board
X Right Board
G_16391_002.eps 290607
Figure 1-7 PWB location
Safety Instructions, Warnings, and Notes
LGE PDP 2K6
2.
EN 5
2. Safety Instructions, Warnings, and Notes
Index of this chapter: 2.1 Warnings 15. During repairs, high voltage or high temperature components must be put away from a lead line. 16. This is a cold chassis but you better use an isolation transformer for safety during repairs. If repairing the electricity source part, you MUST use the isolation transformer. 17. Do not place an object on the glass surface of the display. The glass may break or be scratched. 18. This product may be damaged if it is subjected to excessive stresses (such as excessive voltage, current, or temperature). The absolute maximum ratings specify the limits of these stresses. 19. The recommended operating conditions are conditions in which the normal operation of this product is guaranteed. All the rated values of the electrical specifications are guaranteed within these conditions. Always use the product within the range of the recommended operating conditions. Otherwise, the reliability of the product may be degraded. 20. This product has a glass display surface. Design your system so that excessive shock and load are not applied to the glass. Exercise care that the vent at the corner of the glass panel is not damaged. If the glass panel or vent is damaged, the product is inoperable. 21. Do not cover or wrap the product with a cloth or other covering while power is supplied to the product. 22. Before turning on power to the product, check the wiring of the product and confirm that the supply voltage is within the rated voltage range. If the wiring is wrong or if a voltage outside the rated range is applied, the product may malfunction or be damaged. 23. Do not store this product in a location where temperature and humidity are high. This may cause the product to malfunction. Because this product uses a discharge phenomenon, it may take time to light (operation may be delayed) when the product is used after it has been stored for a long time. In this case, it is recommended to light all cells for about 2 hours (aging). 24. This product is made from various materials such as glass, metal, and plastic. When discarding it, be sure to contact a professional waste disposal operator. 25. If faults occur due to arbitrary modification or disassembly, LG Electronics is not responsible for function, quality or other items. 26. Use of the product with a combination of parameters, conditions, or logic not specified in the specifications of this product is not guaranteed. If intending to use the product in such a way, be sure to consult LGE in advance. 27. Within the warranty period, general faults that occur due to defects in components such as ICs will be rectified by LGE without charge. However, IMAGE STICKING due to misapplying the above provision (12), is not included in the warranty. Repairs due to the other faults may be charged for depending on responsibility for the faults. 28. While assembling the PDP module into a set, use the EMI ground part of the Film Filter for grounding, BEFORE removing the protective film, to prevent that static electricity can damage the TCPs or boards
Notes: · Only authorised persons should perform servicing of this module. · When using/handling this unit, pay special attention to the PDP Module: it should not be enforced into any other way then next rules, warnings, and/or cautions. · "Warning" indicates a hazard that may lead to death or injury if the warning is ignored and the product is handled incorrectly. · "Caution" indicates a hazard that can lead to injury or damage to property if the caution is ignored and the product is handled incorrectly.
2.1
Warnings
1. Do not touch the Signal and Power Connectors while this product operates. Do not touch EMI ground part and Heat Sink of Film Filter. 2. Do not supply a voltage higher than specified to this product. This may damage the product or can create hazardous situations. 3. Do not use this product in locations where the humidity is extremely high, where it may be splashed with water, or where flammable materials surround it. Do not install or use the product in a location that does no satisfy specified environmental conditions. This may damage the product or can create hazardous situations. 4. If a foreign substance (such as water, metal, or liquid) gets inside the product, immediately turn "OFF" the power. Continuing to use the product may cause electric shock or can create hazardous situations. 5. If the product emits smoke and abnormal smell, or makes an abnormal sound, immediately turn "OFF" the power. Continuing to use the product may cause electric shock or can create hazardous situations. 6. Do not (dis)connect the connector while power to the product is "ON". It takes some time for the voltage to drop to a sufficiently low level after the power has been turned "OFF". Confirm that the voltage has dropped to a safe level before (dis)connecting the connector. 7. Do not pull out or insert the power cable from/to an outlet with wet hands. It may cause electric shock. 8. Do not damage or modify the power cable. It may cause electric shock or can create hazardous situations. 9. If the power cable is damaged, or if the connector is loose, do not use the product, otherwise, this can lead to hazardous situations or may cause electric shock. 10. If the power connector, or the connector of the power cable, is dirty or dusty, wipe it with a dry cloth. Otherwise, this can lead to hazardous situations. 11. The PDP module uses a high voltage (max. 450 VDC). Keep the cautions concerning electric shock and do not touch the device circuitry handling the PDP unit. And because the capacitors of the device circuitry may remain charged at the moment of Power "OFF", standing for 1 minute is required in order to touch the device circuitry. 12. Because the PDP module emits heat from the glass panel part and the drive circuitry, the environmental temperature must not be over 40 deg. C. The temperature of the glass panel part is especially high owing to heat from internal drive circuitry. And because the PDP module is driven by high voltage, it must avoid conductive materials. 13. If inserting components or circuit boards in order to repair, be sure to fix a lead line to the connector before soldering. 14. If inserting high-power resistors (metal-oxide film resistor or metal film resistor) in order to repair, insert it 10 mm away from a board.
EN 6
3.
LGE PDP 2K6
Directions for Use
3. Directions for Use
Not applicable.
Mechanical Instructions
LGE PDP 2K6
4.
EN 7
4. Mechanical Instructions
Index of this chapter: 4.1 Mechanical Overviews 4.2 Panel/assy removal 4.2.1 Power Supply Unit 4.2.2 Control Board 4.2.3 Y Sustain Board 4.2.4 Y Driver Board 4.2.5 Z-Sustain board 4.2.6 X-board
4.1
Mechanical Overviews
8
7
6 1 5
4
2
3
G_16391_004.eps 020707
Figure 4-1 Cable dressing Table 4-1 Cable function Cable No. 1 2&3 4&5 6 7&8 Function Drive signal for Y waveform RGB data to be transferred to panel 5V and Va supply for X-boards Left and Right Drive signal for Z-waveform Va, Vs and 5 V supply for PDP operation
EN 8
4.
LGE PDP 2K6
Mechanical Instructions
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Figure 4-2 Label location on PWB's
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Figure 4-3 Label indication
Mechanical Instructions 4.2
1. Warning & Caution Label : Warning and caution for High Voltage, Hot Surface, Wound
LGE PDP 2K6
4.
EN 9
Panel/assy removal
Power Supply Unit 1. Unplug the connectors [1]. 2. Remove the fixation screws [2].
4.2.1
1 Warning (High Voltage, Hazard Voltage) 2 Warning (Hot Surface, Hot part) 3 Caution (Wound, Mechanical Hazard)
2 2 1
2
2. Safety Approval Label
7 cm 1 2 3 4 5
1 2 3 4 5 6 7 8 Model Name Max. Watt (Full White) Max. Volts Max. Amps The Trade Name of LG Electronics TUV Approval Mark Safety Approval Mark Safety Approval No.
6
7 8 2.5 cm
2 1 1
2
2 2 2
G_16391_005.eps 220806
3. Voltage Label : Model Name & Operational Voltage
Figure 4-6 PSU removal 4.2.2 Control Board 1. Unplug the connectors [1]. 2. Remove the fixation screws [2].
7 cm
2.5 ?
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2
2
Figure 4-4 Label information (1)
1
4. Serial No. for Frame Ass'y
2
1
1 2
G_16390_030.eps 220806
1 Serial No of Frame Ass'y Serial No. of Frame Ass'y for Philips are 3315Q-E037B, 3315Q-E037C and 3315Q-E037F .
Figure 4-7 Control board removal
5. Manufacture Serial No. Label of Module
1 Model Name Model Names for Philips are PDP42X3A062, PDP42V7A012, PDP42V74112, PDP42V74102, PDP42V74012, PDP42V74002, PDP42V70102 and PDP42V70002. * PDP42V7???? 1 : PSU Character 2 : Panel character 3 : Circuit character 4 : Mechanical character 2 Bar Code (Code 128, Contains the manufacture No.) 3 Manufacture No. 4 The trade name of LG Electronics 5 Manufactured date (Year & Month) 6 The place Origin 7 Model Suffix : ASLGB21 is Model Suffix for Philips
G_16390_021.eps 020707
Figure 4-5 Label information (2)
EN 10
4.2.3
4.
LGE PDP 2K6
Mechanical Instructions
Y Sustain Board 1. Unplug the connectors [1]. 2. Remove the fixation screws [2]. 3. Slide the board to the right, while unplugging connectors [3]. Do not touch the heatsink!
2 3 2 1
2
2
2 3 1 1 2 2
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Figure 4-10 TCP Separation
Figure 4-8 Y-SUS board removal 4.2.4 Y Driver Board 1. Remove the Y-SUS board [1], as described previously. 2. Remove the fixation screws [2]. 3. Separate the TCP's [3].
2
2
3 1
2
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Figure 4-9 Y driver board removal
Mechanical Instructions
4.2.5 Z-Sustain board 1. Unplug the connectors [1]. 2. Remove the fixation screws [2]. 3. Slide the board to the right, while unplugging connectors [3]. Do not touch the heatsink! 4. Pull out the locks of the FPC's [3} as indicated by the arrows. 5. Condition in Lock part is pulled. 6. Pull FPC as shown by arrow. 4.2.6 X-board 1. 2. 3. 4. 5.
LGE PDP 2K6
4.
EN 11
Unplug the power cable. Unplug the signal cable. Remove the heatsink. Separate the TCP's [1]. Remove the fixation screws [2].
Signal cables
2
2
3
Power cables
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Figure 4-13 X board removal 1/2
1
2 1
X Left board
2 1
2
X Right board
3 1 2 2
G_16390_033.eps 0108069
G_16390_027.eps 220806
Figure 4-14 X board removal 2/2
Figure 4-11 Z-SUS board removal
F_15590_052.eps 040705
Figure 4-12 FPC removal
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Figure 4-15 TCP Separation
EN 12
5.
LGE PDP 2K6
Service Modes, Error Codes, and Fault Finding
5. Service Modes, Error Codes, and Fault Finding
Index of this chapter: 5.1 Quick Module Check 5.1.1 No Display 5.1.2 Bar Defect (Vertical) 5.1.3 Line Defect (Vertical) 5.1.4 Bar Defect (Horizontal) 5.1.5 Line Defect (Horizontal) 5.1.6 Mis-discharge Defect 5.2 Detailed Module Check 5.2.1 No Display 5.2.2 Display Defects 5.2.3 Checking for Component Damage 5.3 Defect Description Form
5.1
Quick Module Check
What kind of defect?
No display? N Vertical defect?
Y
Please follow the "No display" trouble shooting way (see figure below)
Y
Bar defect appeared?
Y Please follow "Bar defect" trouble shooting way (later on in this chapter)
N Horizontal defect? N Misdischarge on screen? Y Y
N Line defect Y Please follow the "Line defect" trouble shooting way (later on in this chapter) Please follow the "Mis-discharge" trouble shooting way (later on in this chapter)
G_16390_018.eps 300806
Figure 5-1 Logical judgement
Trouble Shooting
Check model No. of module, all connectors and cables. No display? N Y Partially no display? N Check power protection Check exhaust tip Check -Vy and Vsc Replace Z B/D Check Oscillator Ctrl B/D Input Y Check signal cables from Ctrl Board
Vertical defect? N Horizontal defect? N Mis discharge on screen?
Y
Check panel appearance
Check TCP + reconnect
Replace X B/D
Replace Ctrl B/D
Y
Check FPC
Reconnect YDR B/D
Replace YDR B/D
Y
Replace YSUS B/D
Replace YDR B/D
Replace Ctrl B/D
G_16390_019.eps 080806
Figure 5-2 Quick check
Service Modes, Error Codes, and Fault Finding
5.1.1 No Display Check each section with following method. If there is a problem, replace or repair that part. If it is not found, go to the next section. Connectors Check all connectors (PSU, Y-SUS, CTRL, Z-SUS). The module may not function normally by a misconnection (can not send signal and/or power). Also misconnection for a long period can cause a specific board to fail.
LGE PDP 2K6
5.
EN 13
G_16390_042.eps 010906
Figure 5-6 Signal input (LVDS) Exhaust Tip Check the Exhaust Tip for cracks with the naked eye to check the vacuum state. If there is a problem, replace the PDP module by a new one. In case of vacuum breakdown, the module makes a shaking noise because of inside gas ventilation. There may be a small crack, which cannot be seen with the naked eye. This noise is different from capacitor noise.
G_16390_039.eps 110806
Figure 5-3 Control + Y-SUS board
NORMAL
F_15590_069.eps 050705
Figure 5-7 Exhaust tip "normal"
G_16390_040.eps 010906
Figure 5-4 Control + Z-SUS board
G_16390_041.eps 110806
Figure 5-5 Control + X board
EN 14
5.
LGE PDP 2K6
Service Modes, Error Codes, and Fault Finding
PSU (see figure "PSU trouble shooting") 1. Check each unit part of PSU inside with naked eye (capacitor, FET, IC, resistor). 2. Check fuse. 3. Check output voltage, which is converted from AC to DC. 4. Voltage Check (5V, Va, Vs). When PSU protection occurred: check for a short circuit between the Y-SUS and the Z-SUS board.
Confirm input voltages
Adjust if not the same voltages
Multimeter Test point (5V, Va ,Vs according to Module Label)
Check fuse
- value +value
Vs Voltage ADJ (VR551) (Vs : range 180 ~195 V)
Way to adjust
Va Voltage ADJ (VR351) (Va : range 55 ~ 65 V)
G_16391_007.eps 030707
Figure 5-8 PSU trouble shooting PSU Power Protection When the power protection gets active, the power is switched "OFF" automatically within 2-3 min. from power "ON". The power protection function protects the boards when a short occurs on circuits of the PDP module, or when a power problem occurs. If there is no power, even after replacing the PSU, find out where the short occurred. In case of a PSU protection, the red LED will be "ON" and an error code will be displayed via the green blinking LED (see also paragraph "Detailed PSU Trouble Shooting", further on). In case of a PSU protection, disconnect the power supply connectors to the boards, to find if the boards are defective or the PSU itself.
Service Modes, Error Codes, and Fault Finding
5.1.2 Bar Defect (Vertical) Check each section with the following method. If there is a problem, replace or repair that part. If not go to the next section. Connector Check the TCP connector and cables. If not connected well, it will result in a bar defect and abnormal display behaviour.
LGE PDP 2K6
5.
EN 15
TCP IC broken
Check here
Figure 5-12 TCP IC broken
F_15590_081.eps 060705
Control Board The Control board supplies the video signal to the TCP. So, if there is a bar defect on screen, it may be a Control board problem.
Bar
MCM
Buffer IC
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R - array
Array Resistor
Figure 5-9 Connector check (1)
6 line
TCP 192 Line output
Check here
Figure 5-13 Control board address flow 5.1.3 Line Defect (Vertical)
F_15590_082.eps 060705
In case of one line open or shorted, check for dirt (foreign substances) in TCP connector. First, try to remove the dirt with compressed air. If, after this, the same line appears again, replace the panel.
Off
Line Open or Short This phenomenon is due to a TCP IC internal short or electrode problem. In this case, replace the panel.
F_15590_079.eps 060705
Figure 5-10 Connector check (2) Checking the TCP Confirm whether the TCP was torn or chopped.
1 electrode open (on flex foil)
TCP torn
1 line open
F_15590_080.eps 060705
F_15590_083.eps 060705
Figure 5-11 TCP torn
Figure 5-14 Single line defect
EN 16
5.
LGE PDP 2K6
Service Modes, Error Codes, and Fault Finding
Line Open or Short with the Same Distance This is an MCM of Control board defect. The MCM cannot be replaced separately. So replace the Control board.
MCM (Multi Chip Module)
Disconnected
MCM of CTRL board defect. MCM can not be replaced separately. So replace the CTRL board.
Screen off
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Figure 5-17 Check drive connectors Scan IC Check Check the diode value of the right side part of the output pin.
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Figure 5-15 Evenly repeated lines 5.1.4 Bar Defect (Horizontal) Most horizontal defects can be repaired. In case of adherence between a part of the film and the rear panel electrode, or a panel electrode open/short, replace the PDP panel.
Normal diode value= 0.6 (forward) Normal diode value= OL (reverse)
F_15590_087.eps 060705
Connector If the connectors on the Y board and Z board are not plugged in well, it can result in a horizontal bar, because the sustain voltage cannot be supplied to the panel. So check the FPC connectors and YSUS<->YDRV first. .
Figure 5-18 Scan IC output diode check 5.1.5 Line Defect (Horizontal) FPC Check In case of one or more horizontal lines, this is probably due to FPC or panel inside the Control board. Y board is just normal.
Disconnected
FPC electrode open
Panel electrode Insulation break down
Horizontal bar
Horizontal 1 line.
F_15590_085.eps 060705
Figure 5-16 Check FPC connectors
F_15590_089.eps 070705
Figure 5-19 Open FPC electrode / Panel electrode breakdown
Service Modes, Error Codes, and Fault Finding
Scan IC Check Check diode value of the right side part of the output pin.
LGE PDP 2K6
5.
EN 17
F_15590_091.eps 290605
Figure 5-20 Scan IC output diode check 5.1.6 Mis-discharge Defect Most of mis-discharge appearance is a problem of the Y-DRV, Y-SUS, or Z board. Check these boards when mis-discharge occurs. Figure 5-22 IPM check
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5.2
5.2.1
Detailed Module Check
No Display The Screen Does Not Display a Picture 1. Check whether on the CTRL board LED (D12, D13, D14) is turned "ON" or not. 2. Check the power and signal cable of the CTRL board. 3. Check if the X, Y, and Z boards are plugged in correctly. 4. Check the connection of the X, Y, and Z boards to the CTRL board. 5. Measure the output wave of X, Y, and Z boards with an oscilloscope (> 200 MHz) and find the troubled board by comparing the output wave with the figures below. Measuring point for the Y board: TP ("Waveform" on the Y-Driver board). Measuring point for the Z board: TP (bead B28). 6. Check the SCAN (Y side) IC. 7. Check the DATA (X side) TCP IC. 8. Replace the CTRL board.
F_15590_093.eps 070705
Figure 5-21 Mis-discharge Checking Order 1. Check the Y-SUS and Z-SUS signal cables. 2. Check if the Y-DRV IC is defective. 3. Check the Y-SUS board voltages (-Vy, Vscw). 4. Check if the Y-SUS and/or Z-SUS IPMs are defective (see paragraph "How to Check an IPM" below). 5. Replace the Control board. How to Check an IPM Forward direction Measure between: · GND (+) and Sus-out (-). · Sus-out (+) and Vs (-). When both test diode values are over 0.4 => OK. Reverse direction Measure between: · GND (-) and Sus-out (+). · Sus-out (-) and Vs (+). When all test diode values are infinite => OK
EN 18
5.
LGE PDP 2K6
Service Modes, Error Codes, and Fault Finding
G_16390_043.eps 300806
Figure 5-23 Output waveforms on X, Y, and Z-boards
Service Modes, Error Codes, and Fault Finding
5.2.2 Display Defects Half of the Screen is Not Shown · On the XR board: 1. Check if the power connector of the XR board is plugged in correctly. 2. Check if the 60-pin connection of the CTRL board to the XR board is plugged in correctly. · On the XL board: 1. Check if the power connector of the XL board is plugged in correctly. 2. Check if the 60-pin connection of the CTRL board to the XL board is plugged in correctly. · Replace relevant X board. Notes: Relationship between Screen and X board: Screen Left half of the screen Right half of the screen X-board Right X-board Left X-board
LGE PDP 2K6
5.
EN 19
Examine with the naked eye traces of blown ICs [3] or other parts.
G_16390_081.eps 010906
Figure 5-26 Data TCP IC examination Unusual Pattern on Display 1. In case of generation of an unusual pattern of the Data TCP IC unit as shown in the picture below, check the fixation of the relevant X board. If that doesn't help, replace the X board. 2. In case of "Case 1": Check the connection between the Data TCP connector and the IC. Replace the relevant X board, or the Control board. 3. In case of "Case 2" or "Case 3": Check the connection between the CTRL board and the relevant X board. Replace the relevant X board or the CTRL board. Note: · If the silicon tape between the X board and the heatsink feels (partially) hard, it has to be replaced.
Left half of the screen
Right half of the screen
Image No image
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Figure 5-24 Screen display "1/2 display" Vertical Parts of the Screen are Missing 1. This can be related to a problem between the Data TCP and the X board. 2. Verify that the connector of the Data TCP is well connected to the X board (it corresponds to the part of the screen that does not display the image). 3. Confirm whether the Data TCP fails (examination with the naked eye of blown ICs or other parts included). If an IC is damaged: replace the panel. In case of an X board short circuit or an open PWB pattern: when the TCP IC is not defective, replace the X board. Notes: · Example of screen display (any of the Data TCPs can be shown).
Case 1
Case 2
Case 3
All Partial Not at all
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G_16390_045.eps 140806
Figure 5-27 Possible cases Scan FPC Problem 1. Check the connection between Y DRV board and Scan FPC. 2. If the Scan IC is defective, replace the Y DRV board.
Figure 5-25 Screen display "Vertical parts missing" · How to examine the Data TCP IC Connect [1] "Va Power" to the minus and [2] "GND" to the plus of an ohmmeter, and then examine the diode in forward or reverse direction.
EN 20
5.
LGE PDP 2K6
Service Modes, Error Codes, and Fault Finding
One eighth of the screen
The screen display is good The screen display is poor
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Display Pattern (Input Signal)
Case 1: Entire Copy
Case 2: Top Copy
Case 3: Bottom Copy
Case 4: Entire Copy G_16390_047.eps 140806
Figure 5-28 Screen display "Scan FPC problem" · Check method of the SCAN IC Connect the Vpp pin to the plus and "GND" to the minus of an ohmmeter, and then examine the diode in forward or reverse direction.
Figure 5-31 Screen display "Data copy in vertical direction" One or Several Vertical Line(s) on the Screen 1. It may be caused by: Open or short circuit on DATA TCP FPC attached panel. Defect on DATA TCP IC attached panel. 2. Replace the panel.
It may show several vert. lines in a quarter or other division part of screen including left case
F_15590_021.eps 040705
F_15590_018.eps 060605
Figure 5-32 Screen display "Vertical lines" One or Several Horizontal Lines on the Screen 1. It may be caused by: Open or short circuit on SCAN FPC attached panel. Defect on SCAN IC attached panel. 2. Replace the panel.
Figure 5-29 Scan IC Vertical Lines with Regular Gap (Vertical Stripe Flash at Special Colour) · Replace the CTRL board.
It may show several horizontal lines including left case
F_15590_022.eps 040705
Figure 5-33 Screen display "Horizontal lines" Low Brightness of Displayed Picture 1. In this case, Z board operation is not complete. 2. Check the power cord of Z board. 3. Check the connector of Z board and CTRL board. 4. Replace the CTRL board or Z board. Partially Other Colour on Full White Screen or Partially Mis-Discharge on Full Black Screen. 1. Check the Y board waveform, see below. 2. Measure the output wave with an oscilloscope (> 200 MHz) and compare the waveform with the waveform in the figure below. Adjust the Y board Set_up voltage (Vsetup) and time-interval "A" by changing VR3 and VR2. Check if -Vy and Vscan have been set correctly with VRy and VRsc respectively, to the value indicated on the voltage label. Measuring Point for "Vsetup" and time-interval "A": Test point "Waveform" on the Y-Driver board. Measuring Points for "-Vy" and "Vscan": Test points "Vy" and "Vsc" on the Y-SUS board.
F_15590_019.eps 230407
Figure 5-30 Screen display "Vertical lines with regular gap" Data Copy in Vertical Direction · Replace the Y-DRV board or the YSUS board.
Service Modes, Error Codes, and Fault Finding
LGE PDP 2K6
5.
EN 21
Set up waveform does not come out
G_16391_008.eps 020707
G_16390_050.eps 150806
Figure 5-34 Y output voltage waveform No Specified Brightness at Specified Colour 1. Check the connector of the CTRL board input signal (LVDS). 2. Replace the CTRL board. 5.2.3 Checking for Component Damage Y IPM (IC 18) or Z IPM (IC 2) When the internal Sustain FET or ER FET of the Y IPM (IC18) or Z IPM (IC2) is damaged, there will be no picture, or the screen is partially mis-discharged. · Test Points: Waveform-GND (Y-DRV board), B28-GND (Z board). · Wave format: Waveform (Y-DRV board) or B28 (Z board) has no output wave.
Figure 5-36 Set_up FET defective When the Set_down FET/Pass_Top FET(1st, 3rd, 4th, 5th FFT of HS2) is damaged, mis-discharge of the entire screen is generated. · Test Point: GND-Waveform (Y-DRV board) · Wave format: as shown in the figure below.
Set up waveform does not come out
G_16390_051.eps 150806
Figure 5-37 Set_down FET defective SCAN IC (Y-DRV board: IC1-10) 1. In case of the SCAN IC is damaged, one horizontal line may be open on the screen. Test Point: ICT output - GND on the Y DRV board. Wave format: As shown below figure. 2. When the SCAN IC is damaged (poor, external electricity, or spark), there might be no picture. Test Point: ICT output - GND on the Y DRV board. Wave format: Output wave format is not generated (you can see if which SCAN IC is damaged). 3. Overlap of two horizontal lines on the screen in case of shorted SCAN IC output. Test Point: ICT output - GND on the Y DRV board. Wave format: As shown in figures "SCAN IC shorted output" and "SCAN IC normal output".
G_16390_049.eps 150806
Figure 5-35 IPM normal output FET assy (Y board: HS2) When the Set_up FET (2nd FFT of HS2) is damaged, there will be no picture. · Test Point: GND-Waveform (Y-DRV board) · Measuring condition: full white pattern. · Wave format: as shown in the figure below.
EN 22
5.
LGE PDP 2K6
Service Modes, Error Codes, and Fault Finding
Test Point: Output TP of GND-TCP Wave format: As shown in figure below. In case of normal wave output, when STB signal is generated, the output must maintain "HIGH". When STB signal is generated again, the output must fall to "LOW". But when the TCP IC is damaged, the STB signal is not generated, and the output falls to "LOW". 2. In case of IC damage, the screen may show no image on the corresponding part, or mis-discharge. In most cases you can see a burn mark on the IC. Test Point: Output TP of GND-TCP Wave format: No output wave.
G_16390_052.eps 150806
Figure 5-38 SCAN IC defective
7us
'
115V
60V
Figure 5-41 COF IC output defective
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F_15590_031.eps 040705
Figure 5-39 SCAN IC shorted output
F_15590_034.eps 060605
Figure 5-42 TCP normal output Crystal (CTRL board: X1) 1. When a crystal is damaged, the screen is not shown. Test Point: 3-pin of GND-Crystal (CTRL board: X1). Wave format: Output wave is not generated. 2. In case of unusual start-up of the crystal, the screen may blink. Wave format: As shown in figure below. Measurement position: Measuring output 3-pin of crystal (CTRL board: X1).
G_16390_053.eps 150806
Figure 5-40 SCAN IC normal output wave TCPs 1. In case of shorting or opening of TCP IC output, the screen may show one or several vertical lines.
Service Modes, Error Codes, and Fault Finding
LGE PDP 2K6
5.
EN 23
F_15590_036.eps 040705
Figure 5-43 Crystal normal output
F_15590_035.eps 060605
Figure 5-44 Crystal defective output
EN 24 5.3
5.
LGE PDP 2K6
Service Modes, Error Codes, and Fault Finding
Defect Description Form
This form must be used by the workshops for warranty claims:
Defect Description Form LCD PLASMA v4.0 final To be filled in by WORKSHOP / WORK CENTER
Date last modified: 28/03/2006
Country:
Type nr./Model nr. set
PHILIPS
Customer Account nr.:
Serial nr. set Type nr. display Serial nr. display Part nr display (12nc) Return number
LCD & Plasma DEFECT DESCRIPTION FORM
Job sheet nr.:
GENERAL REPAIR DATA
Constantly
Other: In hot environment In cold environment
Condition
Intermittently After a while No backlight No picture
Flickering / flashing picture Lines across/down image Inactive row(s) Inactive column(s) Missing colour(s) Light leakage
Other:
Symptom(s)
Picture too bright Scratches (LCD only acc. Pixel criteria sheet V4.0) Only partial picture Unstable picture
Qty of dots:
PANEL REPAIR
Pixel Defect(s):
Dark dots Bright dots
Mark Defect(s):
Following defect symptoms are out of warranty:
Symptoms Out of warranty
- Broken glass / Broken polarizer - Scratch(es) on display / polarizer
- Number of dark/bright pixels within spec. - Burn in (Plasma TV) / Sticking image (LCD TV) - MURA
These symptoms are not claimable.
Defect Board
New Board Serial Nr. Spare Part Nr. Serial Nr.
BOARD REPAIR
Spare Part Nr. 1. 2. 3. 4.
Note 1: The defective LCD-panel / PDP needs to be returned in the same packaging as the new part was send. If not the warranty claim will be rejected. DE10WEG Owner: PHILIPS CE EUROSERVICE
Figure 5-45 Defect Description Form (DDF)
F_15590_115.eps 050407
Block Diagrams, Test Point Overviews, and Waveforms
LGE PDP 2K6
6.
EN 25
6. Block Diagrams, Test Point Overviews, and Waveforms
6.1 Block Diagram PDP Module
(LVDS input)
RA+ RARB+ RBRC+ RCRD+ RDRE+ RERCLK+ RCLKI2C Controller Memory Controller
Input Interface Controller
Driver Timing Controller
(External Power)
Vs (175V~190V) Va (60+ 1V) Vcc (5V)
Display data, Driver timing
Common sustai n dr i v er
Scan D r i v er
Color PDP 1024 X 768 pixels
Address Driver
Applied Voltage level is specified at the time when Full-White pattern is displayed on the panel.
G_16390_079.eps 310806
Figure 6-1 Block Diagram
7. Circuit Diagrams and PWB Layouts
Not applicable
EN 26
8.
LGE PDP 2K6
Alignments
8. Alignments
Index of this chapter: 8.1 General 8.2 Alignments 8.2.1 Tools 8.2.2 Connection Diagram and Set-Up 8.2.4 Y-SUS Alignment
Waveform testpoint
8.1
General
VR3
Notes: · Important: if the PSU board, the Y-SUS board or the ZSUS board is replaced, the technician should check if the voltages delivered by these boards are correct. If not, the boards should be realigned in order to avoid bad performance of the PDP. · Allow the set to warm up according conditions below for at least 10 minutes before adjusting. Service signal: 100% Full White. Service DC voltage: Vcc= 5 V, Va= 60 V, Vs= 180 V. DC/DC Pack voltage: Vsc= 120 V, Vzb = 100 V, -Vy= 200 V Preliminaries environment: Temp (25 ± 5 deg. C), Relative Humidity (65 ± 10%). · Module adjustment should follow below sequence. 1. First, set up the Vsc / -Vy voltage (Vsc= 120 V, -Vy= 200 V). 2. Then, adjust the voltage waveform (refer to adjustment). Caution: Do not leave a still image for more than 10 minutes (especially The Digital pattern or Cross Hatch Pattern which has clear gradation) on the display, because this will cause burn-in effects. 8.2.3
VR2
+
-
5V 1.2 A External DC Power Supply for 5V
65V
0.01A
External
+
Signal Generator (VG-825) Power
-
DC Power Supply for Va
180V 1.3A
External
+
-
DC Power Supply for Vs
(1) The power of the signal generator should be turned "ON" before turning "ON" the power of the DC power supply. (2) The voltage of DC power supplies, in standard of Module input voltage, should be preset as follows: Vcc: 5V, Va: 60V, Vs: 180V (3) The power of power supply must turned "ON" by the following sequence. Reverse direction when turning "off". * Module "ON" : 5V => Va => Vs, Module "OFF": Vs => Va => 5V (4) Signal generator should be selected with 1024 x 768 (XGA) mode. Also the use of the normal PSU (Power Supply Unit) is possible
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Caution
Figure 8-1 Measuring equipment connection diagram PSU Alignment
8.2
8.2.1
Alignments
Tools · · · · Digital oscilloscope: > 200 MHz. DVM (Digital Multimeter): Fluke 187 or similar. Signal generator: VG-828 or similar. DC power supply or PSU: 1 DC power supply for Vs: 0 - 200 V, > 10 A. 1 DC power supply for Va: 0 - 100 V, > 5 A. 1 DC power supply for 5V: 0 - 10 V, > 10 A. A set of wires and appropriate connectors to hook up the power supplies to the display. Required voltage stability of the power supplies: within ± 1% for Vs and Va, within ± 3% for 5V.
PSU (3501Q00203B)
Vs adj VR551 CN806
CN807 Va adj VR351
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1M02
CN805 1M10
8.2.2
Connection Diagram and Set-Up
Z001 F001 1M03
1M46
1. For the connection diagram of the measuring instrument, refer to Fig. "Measuring equipment connection diagram". 2. Set-up the initial voltage Vcc= 5 V, Va= 60 V, Vs= 180 V. Note that the initial set-up voltage can be changed according to the module's characteristics (= the values on the voltage label). 3. Environmental conditions: temperature 25 ± 5 °C, relative humidity 65 ± 10 %.
G_16391_009.eps 020707
Figure 8-2 PSU Alignment Vs Voltage Adjustment 1. Measure the Vs voltage (180...195 VDC) on pin 10 of CN806 on the PSU board (see Figure "PSU Alignment"). The voltage should have the same value as indicated on the label on the PSU. 2. If necessary, adjust Vs to its correct value with potentiometer VR551 on the PSU board.
Alignments
Va Voltage Adjustment 1. Measure the Va voltage (55...65 VDC) on pin 1 of CN806 on the PSU board (see Figure "PSU Alignment"). The voltage should have the same value as indicated on the label on the PSU. 2. If necessary, adjust Va to its correct value with potentiometer VR351 on the PSU board. 8.2.4 Y-SUS Alignment
P2
LGE PDP 2K6
8.
EN 27
2. Adjust -Vy to the value indicated on the voltage sticker with potentiometer VRy on the Y-SUS board. Y -SUS Set-up Voltage Waveform Adjustment Now connect the oscilloscope between the Waveform test point on the Y-Driver board and GND (see Figure ""Y-SUS Alignment"). Trigger with Vs-DA on the Control board (see Figure "Trigger point Vs-DA").
CTRL board
IC12 +3.3V
P1
P7
D12 D13 D14 D15 +1.8V 1 X1 IC1
VS_DA TRIGGER POINT
IC11 IC13
+3.3V
Wave form P2 P2 P3 FS2 FS3 P4 P1 FS1
P3
P4
P10
P11
P1
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Figure 8-4 Trigger point Vs-DA
P5
Setup Setdn P4
VRsc
VR3 VR2 Vsc -Vy
VRy
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P6
Vsc
C51 P7
P8 -Vy R36 P152
Figure 8-5 V set-up waveform 1. Refer to Figure "V set-up waveform". 2. Adjust Vsetup to 150 ± 1 V with potentiometer VR3/Setup on the Y-SUS board (see Figure "Y-SUS Alignment"). 3. Adjust the duration of time-interval "A" to 10 ± 5 µsec with potentiometer VR2/Setdown on the Y-SUS board.
P8
G_16391_011.eps 020707
Figure 8-3 Y-SUS alignment Condition · Set up a situation as shown in "Measuring equipment connection diagram". · Check if the voltages Vs and Va of the PSU are correct (see PSU label and PSU Alignment 8.2.3). Vscan Voltage Adjustment 1. Measure the Vscan voltage across C51 (or on the "Vsc" test point on the right of connector P4) on the Y-SUS board (see Figure "Y-SUS Alignment"). 2. Adjust Vsc to the value indicated on the voltage sticker with potentiometer VRsc on the Y-SUS board. -Vy Voltage Adjustment 1. Measure the Vy voltage across R36 (or on the "Vy" test point on the DC converter) on the Y-SUS board (see Figure "Y-SUS Alignment").
EN 28
8.2.5
8.
LGE PDP 2K6
Alignments
8.2.6 Internal Test Patterns The CTRL board is capable of generating its own video test patterns. To generate the test patterns, do as follows: · Disconnect the mains cord. · Disconnect the SSB of the TV set, by removing the cables of connectors 1M03 and 1M46 on the PSU. · Reconnect the mains cord. · Connect pins 1 & 2 or pins 3 & 4 of Connector P1 on the Control Board (see Figure below) to each other. · Now the internal test patterns are automatically shown in a loop.
Z-SUS Alignment
P4
P2 IC12
CTRL board
+3.3V
P2
P7
D12 D13 D14 D15 +1.8V 1 X1 IC1
VS_DA TRIGGER POINT
IC11 IC13
+3.3V
P3
P4
P10
P11
P1
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B28
Figure 8-7 P1: Connector for Internal Test Patterns
P1 FS1 Q18 FS2 FS3 P6 VRzb Vzb GND
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P5
Figure 8-6 Z-SUS alignment Condition · Set up a situation as shown in "Measuring equipment connection diagram". · Check if the voltages Vs and Va of the PSU are correct (see PSU label and PSU Alignment 8.2.3). Vzb (Z bias) Voltage Adjustment 1. Measure the voltage between the Vzb test point (the drain of Q18) and GND on the Z-SUS board (see Figure "Z-SUS Alignment"). 2. Adjust Vzb to 100 ± 0.5 V with potentiometerVRzb on the Z-SUS board.
Circuit Descriptions, Abbreviation List, and IC Data Sheets
LGE PDP 2K6
9.
EN 29
9. Circuit Descriptions, Abbreviation List, and IC Data Sheets
Index of this chapter: 9.1 Introduction 9.2 Power Supply Unit (PSU) 9.3 Control Board 9.4 X Board 9.5 Y Sustain Board 9.6 Y Drive Board 9.7 Z Sustain Board 9.8 DC/DC Converter Part 9.9 FPC (Flexible Printed Circuit) 9.10 FFC (Flat Flexible Cable) 9.11 TCP (Tape Carrier Package) 9.12 IPM (Intelligent Power Modules) 9.13 Abbreviation List 9.14 IC Data Sheets
9.1
Introduction
The 42X3* panel is LGE's HD successor for the year 2007 of the 42V7* panel.
9.2
9.2.1
Power Supply Unit (PSU)
Purpose · · · To convert an input voltage of 100 ~ 240 Volt AC to voltages that the different boards and the panel need. Output voltages: Vcc (5 V), Vs (180 ~ 200 V), and Va (60 ~ 65 V), all DC. The PSU switches "OFF" automatically, when it detects errors like short circuits.
Warning: Voltages on the PSU reach 390 Volt maximum, so be very careful when handling it!
G_16391_006.eps 020707
Figure 9-1 Power supply
EN 30
9.2.2
9.
LGE PDP 2K6
Circuit Descriptions, Abbreviation List, and IC Data Sheets
certain sequence. This sequence is shown in the following figure.
Power ON and Power OFF Sequence · For a correct functioning of the display, the different supply voltages have to be powered up and down according to a
Vcc (5V)
T On T Off
Va
T VaR T VaF
Vs
T VsR T VsF Min. 5 frames
Power_on
3 Sec
Power_off
3 Sec Normal Display Min. 2 frame
DISPEN
Symbol T On T Off T VaR T VaF T VsR T VsF
Description Time interval between 90% of Vcc and 10% of Vs when Power On Time interval between 10% of Vs and 90% of Vcc when Power Off Rising Time of Va (10% to 90%) Falling Time of Va (90% to 10%) Rising Time of Vs (10% to 90%) Falling Time of Vs (90% to 10%)
Min. 0.2
Max. -
unit sec
20 10 100 100 90
400 300 800 500
ms ms ms ms ms
If power sequence does not meet to above sequence diagram, PDP drivers may be damaged permanently. Even when AC input power supply is switched ON/OFF, above sequence should be observed strictly. Transition section: Transition section is needed to drive PDP as a initial and set-up period. At this period, Brightness is low and there is no gray. If DISPEN is low, picture is changed to BLACK pattern. Signal is operated by synchronized vertical signal. The panel will not malfunction, if DISPEN is high at start up.
G_16390_080.eps 310806
Figure 9-2 Power supply sequence
9.3
9.3.1
Control Board
Purpose Creates signal processing, and controls many FETs on each DRIVER board with R, G, and B signals.
9.4
9.4.1
X Board
Purpose Receives LOGIC signal from the CONTROL board and makes the ADDRESS PULSE (generates Address discharge) by ON/ OFF operation, and then supplies this waveform to TCP (data).
X Left board
MCM (Multi Chip Module)
LVDS Signal Input pin
8 bit or 10 bit signal
MCM ( Multi Chip Module )
6 bi t signal
X Right board
TCP
G_16390_035.eps 100806
G_16390_083.eps 010906
Figure 9-4 X boards
Figure 9-3 Control board
Circuit Descriptions, Abbreviation List, and IC Data Sheets 9.5
9.5.1
LGE PDP 2K6
9.
EN 31
Y Sustain Board
Purpose Generates Sustain waveform, Reset, Vsc (Scan) and -Vy voltages, and supplies them to the Y DRIVE board.
9.7
9.7.1
Z Sustain Board
Purpose To make the SUSTAIN and ERASE pulses that generate SUSTAIN discharge in the panel by receiving LOGIC signal from CONTROL board. This waveform is then supplied to the panel through FPC (Z).
9.7.2
Main Components IPM, FET, DIODE, electrolytic capacitor, and E/R coil.
* IPM (Intelligent Power Module) E/R(Energy recovery)
* IPM (Intelligent Power Module) E/R(Energy recovery)
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Figure 9-5 Y Sustain board 9.5.2 Main Components IPM, diodes, electrolytic capacitors, and FETs.
G_16390_026.eps 100806
9.6
9.6.1
Y Drive Board
Purpose · · To supply Sustain, Reset waveform, made by the Y-SUS board, to the PDP through the SCAN DRIVER IC. To supply a waveform that selects the horizontal electrodes (Y SUSTAIN electrodes) sequentially. Potential difference is 0 V between GND and Vpp of the DRIVER IC during the SUSTAIN period. Generates a potential difference between GND and Vpp only during the SCAN period.
Figure 9-7 Z Sustain Board
·Y DRIVER SCAN IC
Assembled status
Status separated from Y-SUS Board
G_16390_036.eps 100806
Figure 9-6 Y Drive board
EN 32 9.8
9.8.1
9.
LGE PDP 2K6
Circuit Descriptions, Abbreviation List, and IC Data Sheets 9.9
9.9.1
DC/DC Converter Part
Purpose From 5V, Vs, and Va (from the PSU), the DC/DC converter makes 5V, 15V, Vy, Vsc, 5Vf, and Va, which are essential for each board.
PSU 5V YSUS Board 5V 15V 5Vf (Floating Voltage) Vy Vsc
FPC (Flexible Printed Circuit)
Purpose To supply a driving waveform to the PDP by connecting a PAD electrode of the PDP with a PWB (Y and Z boards). · There are two types of this for the Y board: One is singlesided, the other double-sided (these have a pattern on it). · For Z board there is no pattern, single-sided, and Beta type (all of copper surface).
DC/DC Convert
Vs
DC/DC Convert
F_15590_058.eps 200605
G_16390_037.eps 100806
Figure 9-10 Flexible Printed Circuit Figure 9-8 DC/DC Converter block diagram
9.10 FFC (Flat Flexible Cable)
9.10.1 Purpose For connecting LOGIC signals between boards. There are two types · 0.5 mm pitch, 50-pin type. · 1.0 mm pitch, 30-pin type.
F_15590_059.eps 200605
Figure 9-11 Flat Flexible Cable
9.11 TCP (Tape Carrier Package)
9.11.1 Purpose To supply a 6-bit RGB signal to the panel, by connecting a PAD electrode of the panel with the X board.
DC/DC converter parts
G_16390_038.eps 010906
Figure 9-9 DC/DC Converter part
F_15590_060.eps 200605
Figure 9-12 Tape Carrier Package
Circuit Descriptions, Abbreviation List, and IC Data Sheets 9.12 IPM (Intelligent Power Modules)
9.12.1 Purpose Attached to Y board (SUS IPM) and Z board (ER IPM): · SUS IPM generates the Sustain waveform · ER IPM performs an Energy Recovery function
LGE PDP 2K6
9.
EN 33
9.13 Abbreviation List
AC B/D CLK COF CTRL DC FET FPC I/O IC IPM LED LGE MCM PCB PDP PFC PSU PWB RGB STB TCP Alternating Current Board Clock signal Chip On Flex / Foil / Film Control (board) Direct Current Field Effect Transistor Flexible Printed Circuit Input/Output Integrated Circuit Intelligent Power Module Light Emitting Diode Lucky Goldstar Electronics (supplier) Multi Chip Module Printed Circuit Board (same as PWB) Plasma Display Panel Power Factor Corrector circuit Power Supply Unit Printed Wiring Board (same as PCB) Red, Green, Blue colour space Stand-by signal Tape Carrier Package
* IPM (Intelligent Power Module) E/R(Energy recovery) Y-SUS BOARD
9.14 IC Data Sheets
Not applicable
* IPM (Intelligent Power Module) E/R(Energy recovery) Z-SUS BOARD
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Figure 9-13 Intelligent Power Modules 9.12.2 Main Components Heatsink, capacitor, diode, IC, resistor, transistor, and FET.
EN 34
10.
LGE PDP 2K6
Spare Parts List
10. Spare Parts List
Please refer to the Philips Service website, for an actual overview (monthly updated).
11. Revision List
Manual xxxx xxx xxxx.0 · First release. Manual xxxx xxx xxxx.1 · References in text and graphics to PSU model 3501Q00201A (not used in this PDP model) changed to references to PSU model 3501Q00203B. · Corrections in texts referring to the PSU, Y-SUS and ZSUS boards. Manual xxxx xxx xxxx.2 · Text on how to generate Internal Test Patterns added to Chapter 8, Alignments. · Minor text corrections added.