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ChungHwa Picture tubes ,Ltd
OE Business Unit
PDP
Service Menu
Polished by After Service Section
APP Dept. Product Planning Division
First Edition Copyright : Ver_001.
All Rights Reversed
1
Content :
0. Safety measures / Attention................................................................
1. Summary .........................................................
2. Introduction to PDP circuit boards.......................................................
2.1 VIF board .................................................................................
2.1.1 VIF basic framework...............................................................
2.1.2 Photos of VIF Board................................................................
2.1.3 Pin assignments of connectors .....................................................
2.1.4 VIF (Video interface)................................................................
2.1.5 System Block diagram...............................................................
2.1.6 Some Waveforms......................................................................
2.2 DIF board .................................................................................
2.2.1 DIF 2.95 board.......................................................................
2.2.2 Equipments...........................................................................
2.2.3 Simple electric circuit test..........................................................
2.2.4 Advanced electric circuit test......................................................
2.2.5 IC100 - IC106 :main signal waveform measuring...............................
2.2.6 Waveform ...........................................................................
2.3 POWER board ...........................................................................
2.3.1 Introduction .........................................................................
2.3.2 The output power....................................................................
2.3.3 pin assignments of connectors....................................................
2.3.4. Troubleshooting....................................................................
2.4 X-Sustainer board .......................................................................
2.4.1 X-Sustainer board's pin alignments .............................................
2.4.2 X-side function explanation :............................................................
2.5 Y-Sustainer board ........................................................................
2.5.1 Y-Sustainer board's pin alignments................................................
2.5.2 Y-side function explanation...............................................................
3. PDP repairing flow-chart ..................................................................
3.1 Main flow-chart........................................................................
3.2 No picture repairing flow-chart......................................................
3.3 X sustainer malfunction repairing flow-chart.......................................
3.4 Y sustainer malfunction repairing flow-chart.......................................
4. Generally common defective checking and testing.......................................
4.1 Phenomenon 1 : Dark screen and flickering.........................................
4.2 Phenomenon 2 : 170v limit current...................................................
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5. Inspection........................................................................................
5.1 Inspection.................................................................................
6. Common use of BOM lists ..................................................................
7. Repair record: ..............................................................................
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0. Safety measures and Attentions:
1. Observation and measures carefully
When in repair service , should pay attention to these safety measures and the description
Of the service menu.
2.Preparation:
The preparation for repair in a defective PDP is necessary , exstable working table , repair
Tools , measuring equipments , replace parts.........etc
3.Pay attention to electrical shock:
Because the PDP is using the AC power source , and the power board contents high voltage ,
so to preventing the high voltage shock is necessary . Such as , using a isolated transformer ,
plastic glove , charged components should be discharged first . The high voltage is supplied
to inferior components , so when repair the PDP should pay more attentions.
4.Using the specified components:
Some components provide fire-resist and endure high-voltage. So when replace these parts
, should use the same characteristic components. So when replace a component should according
to the BOM form for a assigned component.
5.Stable the components and recovery the wiring :
Some components are using isolated sleeve or adhesive tape to isolate from the electric
board . Moreover the interior wiring should be arranged again to prevent the interference
from given out heat components and high voltage components .So after repairing , should
recover the same layout of the PDP.
6.Integrity of the electric circuit :
Use the specified components to replace the defective parts . Under any circumstancedo
not try to modified the electric circuit .
7.Safety check after repairing
After repairing , should check the screws and the wiring condition .Checking the quality
of repairing components . The insulation test of the metal component , power cord to make
sure the safety of repairing.
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1 . Summary :
1.1 Photos of disassembly:
Note.3
Fig. 1 Fig. 2
1.2 Procedure:
1.First put on the PDP on a stable working table and power off the PDP which is going to repair ,
then using a screwdriver to unfasten the screws which fasten the back cover .
2.Befor taking apart as Fig.1 shown , after taking apart as Fig. 2 shown .
3.The screws of back cover
a. pan-headed screw M4 13 pcs
b. screw TB-12 18 pcs
c. stand screw M5-16 4pcs
1.3 Note:
1.Make sure that the power is off before taking apart .
2.After taking apart , put the screws at a safe place to avoid losing
3.Taking apart and installing the back cover , be careful not to pull out the switch of AC power
switch .
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1.4 Introduction to PDP circuit board:
1.4.1The introduction of circuit board at Back board:
Audio Board DIF Board
X-SUSTAINER
Y-Extension
board (upper X-Extension
and lower) board (upper
and lower)
AC Line Filter
VIF(PC Module &
Y-SUSTAINER POWER SUPPLY W-Extension board (left
Video Module)
and right)
1.4.2 Explanation(Function / Characteristic)
a. POWER(1).Input Voltage (AC 110V240V47HZ63HZ)Max. range 90V265V.
(2).Providing electrical power to all the PCB.
b. VIFTransfer S-video , Video , PC(D-sub& DVI) , HDTV signal to digital signal to the DIF
board.
c. DIFDealing with the digital signal for output to panel.
d. X-Sustainer / Y-Sustainer(1).Receiving the signal from DIF.
(2). Output scanning waveform.
e. X / Y-Extension board: Receive signal from X / Y sustainer , output horizontal scanning waveform
to the panel.
f. W-Extension board: Receive signal from DIF , output the vertical scanning waveform , addressing
data.
g. Audio BoardAmplifying the audio signal to the internal or external speakers of which select.
h. AC Line FilterAC power line filter
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1.4.3. PDP 46" block diagram:
Audio-AMP
X-Upper
Y-Upper
Power CN1 PX1 PX2
PY DX1
PY PX1 PX2 PW J15 J16 CV1 DX1
J17
Y-Sustainer J12 DIF X-Sustainer
X-Lower
Y-Lower
POWER VIF
DW1 DW2
J11
Key PAD Front Receiver
W-Board DW1 DW2 W-Board
AC Filter
AC 90~240 V Panel
1.4.4 Function:
a. The input voltage AC 90 ~ 240 through line filter to the power board , after main switch is on
then power board generate 5 volts to VIF board. The VIF board after receiving 5 volts then
from CN connector send signal(5 volts) to power board .Power board generates 5 volts to DIF
and VIF .When VIF receives the 5 volts ,then generates 5 volts to power board through CN
connector(pin1 ,pin6) , and it means that DIF has received 5 volts already.
b. When power on(key-pad or receiver),the VIF send VCC_ON signal to power to start Vcc and
Vf voltage through CN connector(pin2).
c. The VIF sends HV_ON signal to power board to start high voltage Vs , Vxg , Vw through CN
connector(pin4).
d. At the same time the signal from VIF to DIF for signal processing , then through X / Y / W
board to start the screen.
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1.4.5 The waveform of connector:
a. CN1-V CN1-D:
8bit R [7:0]
8bit G [7:0]
8bit B [7:0]
clock
Hsync
Vsync
Blank (Blank H)
I*2C
a-1. PIN assignment :
PIN No. 1 2 3 4 5 6 7 8 9 10 11
Output CLK0 CKL1 Gnd BLK Gnd VD Gnd HD Gnd Gnd B7
12 13 14 15 16 17 18 19 20 21 22 23
B6 B5 B4 Gnd B3 B2 B1 B0 Gnd G7 G6 G5
24 25 26 27 28 29 30 31 32 33 34 35
G4 Gnd G3 G2 G1 G0 Gnd R7 R6 R5 R4 Gnd
36 37 38 39 40 41 42 43 44 45
R3 R2 R1 R0 Gnd None TP66 none Sda/TP5 Scl/TP2
a-2. Signal explanation:
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b. DX1 to DXS:
b-1 PIN assignment :
PIN No. 1 2 3 4 5 6 7 8 9 10
Output Gnd XDD2/TP1 XDD1/TP1 Gnd XP2L/TP1 XG2L/TP1 XG3L/TP1 XG1L/TP1 Gnd XG1H/TP
40 39 38 37 36 35 134
11 12 13 14 15 16 17 18 19 20 21
XSU/TP13 XAEL/TP1 XEAH/TP Gnd XELL/TB1 XEFH/TP1 Gnd XNEL/TP1 XNEH/TP Gnd XCLK/TP1
3 52 151 50 49 48 147 46
22 23 24 25 26 27 28 29 30
Gnd XSI2/TP14 Gnd XLE/TB14 XSTB/TP1 XTSC/TP1 Gnd XSI1/TP14 Gnd
5 4 42 41 3
c. DW1 to DW1(DIF to W board)
SignalDDR(27.0)DDG(27.0)DDB(27.0)DLE(2.0)DBL(2.0)DBH(2.0)DHZ(2.0)
PIN No. 1 2 3 4 5 6 7 8 9 10 11
Output GED YSC2A YSC1A GED YEELA YEEHA GED YEFLA YEFHA GED YCA2B
12 13 14 15 16 17 18 19 20 21 22 23
YSC1B GED YNELB YNEHB GED YEFLB YEFHB GED DDB27 DDG27 DDR27 GED
24 25 26 27 28 29 30 31 32 33 34 35
DDB26 DDG26 DDR26 GED DDB25 DDG25 DDR25 GED DDB24 DDG24 DDR24 GED
36 37 38 39 40 41 42 43 44 45 46 47
DDB23 DDG23 DDR23 GED DDB22 DDG22 DDR22 GED DDB21 DDG21 DDR21 GED
48 49 50 51 52 53 54 55 56 57 58 59
DDB20 DDG20 DDR20 GED DDB19 DDG19 DDR19 GED DDB18 DDG18 DDR18 GED
60 61 62 63 64 65 66 67 68 69 70 71
DDB17 DDG17 DDR17 GED DDB16 DDG16 DDR16 GED DHZ2 DBH2 DBL2 DLE2
72 73 74 75 76 77 78 79 80
GED RAKa GED RAKb GED V50 V50 V50 V50
d. DW2 to DW2 (DIF to W board)
signalDDR(27.0)DDG(27.0)DDB(27.0)DLE(2.0)DBL(2.0)DBH(2.0)DHZ(2.0)
PIN N. 1 2 3 4 5 6 7 8 9 10 11
Output V50 V50 V50 GED DDB15 DDG15 DDR15 DDB14 GED DDG14 DDR14
12 13 14 15 16 17 18 19 20 21 22 23
DDB13 DDG13 GED DDR13 DDB12 DDG12 DDR12 GED DDB11 DDG11 DDR11 DDB10
24 25 26 27 28 29 30 31 32 33 34 35
9
GED DDG10 DDR10 DDB9 DDG9 GED DDR9 DDB8 DDG8 DDR8 GED DHZ1
36 37 38 39 40 41 42 43 44 45 46 47
DBH1 GED DBL1 DLE1 GED GAKa GED DHZ0 DBH0 GED DBL0 DLE0
48 49 50 51 52 53 54 55 56 57 58 59
GED GAKb GED DDB7 DDG7 DDR7 DDB6 GED DDG6 DDR6 DDB5 DDG5
60 61 62 63 64 65 66 67 68 69 70 71
GED DDR5 DDB4 DDG4 DDR4 GED DDB3 DDG3 DDR3 DDB2 GED DDG2
72 73 74 75 76 77 78 79 80
DDR2 DDB1 DDG1 GED DDR1 DDB0 DDG0 DDR0 GED
e. W-COF to Y-Sustainer
PIN No 1 2 3 4 5 6 7 8 9 10
Output LGED YSC2A YSC1A LGND YNELA YNEHA LGND YEFLA YEFHA LGND
PIN No 11 12 13 14 15 16 17 18 19 20
Output LGND YSC2B YSC1B LGND YNELA YNEHA LGND YEFLB YEFHB LGND
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I,1 I,2 ............... I,484
W
3. 3. 4.
1. 21. 8.
1 1 3
Y 0 6 3
Xv
g X1 X2 ...................
X484
0. 4.
4.5
6 5
Ya
4. 4.
0.6
5 5
Yb
XVDD
LOG2
XSI1
XSI2
XLE
XCLK
XSTB
XTSC
4. 2
11
I,1 I,2 ............... I,484
W
3. 4.
1. 21. 3. 8. 1 3
0 6 1 3
Y
Xv
g
X1 X2 ...................
X484
0.6 4.5 4.5
Ya
0.6 4.5
4.5
Yb
XLFH
XEFL
XNEH
XNEL
*
XG1H
XG1L*
XG2L
*
XP2L
*
XS
U
XAE
H
XAEL
XDD1
XDD2*
XTSC
XSTB
4. 1
12
13
f. Power signalPower to Y-Sustainer (PY)
PIN No. 1 2 3 4 5 6 7 8 9
Symbol Vcc-G Vcc Vf-G Vf Vw Vw-G Vs-G None Vs
Output 5V 5V 15v 15v 65V 65V 170V None 170v
g. Power signal : Power to X-Sustainer (PX1)
PIN No. 1 2 3 4 5 6 7
Symbol Vf-G Vf Vw Vw-G Vs-G None Vs
Output 15v 15v 65V 65V 170V None 170v
h. Power signalPower to X-Sustainer (PX2)
PIN No. 1 2 3 4 5
Symbol Vxg None Vxg-G Vcc Vcc
Output -160V None 15v 15v 65V
2.1 VIF Board:
Summary:
General digital video signals include VsyncHsyncR(8Bit)G(8Bit)B(8Bit) and Data
Enable(Blank);the VIF of PDP is making for processing these digital signal.
Because PDP belonging a high end product , so its application should include the functions of
monitor(analog VGA , digital DVI signal input). And for consumer's sake , the VIF should have the
functions of video , like audio , composite , s-video , component signal processing.
Below is the explanation of VIF system:
The role of VIF
UHF/VHF TV
Cable TV
HDTV
VTR VIF DIF
DVD Player
PC
Home Video Game
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Currently the video signal sources are video cassette recorder , DVD player , CATV , RF tuner , VGA
card(PC). In order that all the video signal sources can be displayed on PDP , so we need a interface to
transfer these signals to a specified signals for PDP to display , and this is the function of VIF(Video
Interface).
2.1.1 Basic framework of VIF board
For dealing with the signals of CVBS , S-video and Component, it requires a video decoder IC .
And the output of video decoder will input to a de-interlace chip IC for a stable image quality .
Because the TV system uses interlace scanning , it causes flickers on the screen . To improve this
situation so we use a de-interlace chip IC . The ADC(Analog to Digital Converter) IC converts
the analog RGB signal to digital RGB signal. The TMDS(Transition Minimized Differential Signaling)
decoder IC transmits digital RGB signal. All the output of ICs' signal send to scalar IC. The
relationship is shown as below , and make a brief explanation of the system.
ADC Scalar
D-SUB Out to DIF
Converter Chip
TMDS
DVI Receiver
Y/Cb/Cr
De_
Interlace
S-Video
Video Micro_
Composite
Decoder Controller
a. ADC Converter:AD9888 KS
The AD9888 is a complete 8 bit , 205 MSPS monolithic analog interface optimized for capturing
RGB graphics signals. Its 205 MSPS encode rate capability and full-power analog bandwidth of
500 MHz supports resolutions up to UXGA(1600 x1200 @ 75 Hz).
b. TMDS Receiver: SIL153BCT100
The Sil153BCT100 receiver uses PanelLink Digital technology to support high resolution displays up
to SXGA(25MHz~112MHz) . The Sil153B receiver supports up to true color panels (24 bit/pixel,
16.7M colors) in 1 or 2 pixels/clock mode. In addition , the receiver data output is time staggered to
15
reduce ground bounce that affects EMI.
c. VIDEO Decoder:SAA7118E
The SAA7118E decoder is a ADC too , but it can deal with the ordinary TV signals. The
SAA7118E can input Composite (fig.A)S-video (fig.B)Component (fig.C) and its outputs
Are digital Y(Luminance) , C(Chromacity) signals. And also can adjust brightness , contrast ,
Saturation , hue .
Fig.A : Composite for COLOR BAR
Fig.B-1 Y signal of S-video
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Fig.B-2 C signal of S-video
Fig.C-1 Y-signal of Component
Fig.C-2 Cb-signal of Component
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Fig.C-3 Cr-signal of Component
d. De-interlace:SIL504CM208
The Sil504 transfer interlacing signals to progressive signals. The advantage of progressive
signals is that the scanning rate doubling to let the screen more stable and non-flickering. Besides, the
sources of input may have 24 0r 30 or 25 frames per sec, so the de-interlaced chip shall tell from the
differences and processing the signals. The basic principle of de-interlaced IC is combined the odd and
even fields to a frame , and the processing needs a memory IC(SDRAM) to store these signals for
processing . For the improving the quality of image sake , more and more TVs or DVD players all
have the functions of progressive scanning.
e. Image Processor chip:PW171-20U(system on chip)
Scaling function :
The Image scalars provide high quality up and down image scaling . For the applications of VIF , the
input signals could be VGA , SVGA , XGA formats , and its output fixed at 852 x 480 @60 HZ . For
example , SVGA format:800 x 600 @75Hz , first scaling down : Horizontal 800 640Vertical
600 480 , 75 frames / sec after frame rate conversion become 60 frames per sec. Then scaling up
640 852 , to accomplish the scaling function.
Micro Processor Function :
This chip includes microprocessor(on-chip 80x86) ; selectable function and I/O interface control .
With 3 groups of 8-bit programmable I/O , 1 group of RS-232 communication port , IR
decoder ,timer and a PWM generator
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OSD Function :
The on-screen-display(OSD) can be used for startup screens , menus , and scribble functions.
2.1.2 Photos of VIF Board :
a. Video Module:
3D Y/C SEP
To VIF Main Board
Video Decoder
Audio/Video S-Video Y/Cb/Cr Audio
b 2nd PC Module:
To VIF Main Board
Switch
PC 1
PC Audio IN
PC OUT V H B G R
PC 2
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c. VIF Main Board
J16 To DIF
J15
SDRAM
J17
Image
Processor
Tone
Control
Reset
SDRAM
J12
De_interlace
To Video/PC Module TMDS
ADC
DVI J11
RS232
D-SUB
2.1.3 Pin assignments of connectors :
a. J12 : Key Pad Signal
NO 1 2 3 4 5 6 7 8
ITEM Power Right Left Up Down Menu Input Gnd
b. J11 : Receiver/Indicator Signal
NO 1 2 3 4 5 6
ITEM NC Red LED Green LED Gnd Ir_Rcv +5V
20
c. J17 : Audio Signal
NO 1 2 3 4 5 6
SPK
ITEM Mute L_Out L_Gnd R_Out R_Gnd
Int/Ext
d. J16 : Power