lg_42_inch_plasma_tv_training_manual.ppt

42 Inch(Wide) PDP SVC Training Manual
LG Electronics / DND QA

Contents
Ⅰ. Usage/Service Points to be concerned
Ⅱ. Module formation & spec
Ⅲ. Screen defect diagnosis
1. 4/7 or 3/7 of screen is not displayed.
2. Screen by Data COF is not displayed.
3. one or more of Data COF IC have regular vertical lines.
4. Data COF IC unit error pattern
5. The screen by Scan COF is not displayed.
6. Regular- interval vertical line in the whole screen.
7. Vertical data copy
8. One or more vertical bars.
9. One or more horizontal bars.
10. Input signal pattern is displayed but the whole brightness of screen is dark.
11. In full white pattern, foreign color is displayed or in full black pattern, mis-
discharge is partially occurred..
12. In full white pattern, the brightness is getting darker toward the center.
13. A specific brightness of one color is not clear.
Ⅳ. Non-picture defect diagnosis
Ⅴ. One Point Service Guide(42 Inch, 40 Inch)

LG Electronics/DND QA Gr
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Ⅰ. Usage/Service points to be concerned
SUGGGESTIONS
1. Static precaution
Drive section circuit is C-MOS circuit, so to protect against static electricity, wear static-proof wrist band.
2. Cleaning
when wiping panel, do not use liquid cleaner or other chemicals . Use a damp cloth for cleaning .
3. handling
Color PDP uses high voltage(Max.500V). Be aware of electronic shock when handling PDP Unit and don’t touch drive circuit.
and even driver circuit’s capacitor is turned off but charge still remains there, so to touch drive circuit, be sure to wait at least 1 minute.
4. Warning when connecting signal & Power Connector in operation
do not touch connector while Color PDP is operating.
5. PDP servicing and guarantee
Glass Panel and Drive Circuit section are linked and operating together.
if you disassemble and assemble the product in your own hands , LGE is exempted from the guarantee of function, quality and etc.
6. Damage in still image
Color PDP uses fluorescent material. The quality of PDP fluorescence by nature becomes deteriorated if using it in the same condition of CRT.
To prevent this symptom, input full-screen regularly or use screensaver software.
So do not display the still image for a long time.
7. Temperature & ventilation
Color PDP’s Glass Panel section and Drive circuit section emit the heat so the temperature shall be kept under 40.
the temperature of glass panel section is pretty high because built-in drive circuit emits the heat.
PDP is operating with high voltage therefore be sure to keep it away from conductive objects.
8. Warning when handling Module
be aware that PDP shall not be touched by metal or hard objects and shocked by the heat or mechanical force.
be careful when disassembling or handling.
be sure to wear glove for preventing injury when the glass’s broken.
Color PDP is a display device consisting of Panel section & Drive section. Panel section is composed of electrode,
fluorescent substances ,dielectrics and gases, and drive section is a combination of electrical circuit section and
PCB section. We call this concrete as PDP Module Ass’y and the following shows warning.

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Service warning
1. One DVM ( FLUKE 87 or similar type )
2. Digital Oscilloscope ( over 200MHZ )
Defect diagnosis tool
1. When inserting parts or PCB, fasten the lead line to terminal before soldering.
2. When inserting high- voltage resistance(metal oxide film resistance or metal film resistance), keep 10mm away from PCB
3. High-voltage or high-temperature parts shall be away from the lead line.
4. This chassis is insulation(cold) chassis but for safety, it is better to use insulation trance.
when servicing power board, be sure to use insulation trance.
5. While PDP Module is in operation, do not connect or remove lines.
※ With COF or panel defect, report it to LGE PDP module service department.

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Power : 220V 60Hz
Power consumption : 340W
1056
1259
635
693.5
220
779.5
1379
114.8
281
82
91.5
aspect ratio: 16:9
screen size (H X V) : 920.1 X 518.4mm
resolution : 852 X 480 (VGA)
Cell Pitch (H X V) : 0.36 X 1.08
displayable colors (R,G,B) : 1,677K (256 X 256 X 256)
brightness : 250 cd/㎡ (w/o filter : 550 cd/㎡ )
contrast ratio : 250:1 (w/o filter ; 700:1 )
color temperature : over 8500˚ K
viewing angle : over 160˚
input signal : NTSC, HD, VGA ,SVGA
Twin Picture : PC/AV
PC input : D-SUB 15
Control : D-SUB25 / STB connection
Video input : CVBS
S-Video input
DVD input(Y,Cb,Cr)/R,L : Y/Y. Pb/Cb, Pr/Cr+R/L
Audio input : R/L
Power Cable : 3심 (Ground terminal)
Sound Output (Speaker) : R.L Out
R,G,B input : D-SUB25 (RGBHV) : STB connection
AC Input : 220V 60Hz
MN-42PZ10 Spec & Features

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ITEMS SPECIFICATIONS(Tentative)
Screen Size: 42 inch/ 106cm diagonal
Aspect Ratio: 16 :9 (width:height)
Resolution: 852 x 480 Pixels(SD grade)
Peak Brightness : typ.240cd/m² (with filter 60%)
Contrast Ratio: 700:1(Dark Room & with filter 45%)
Viewing Angle: 160° horizontally and vertically
Displayable Colors: 16.7 million
Weight: kg (MNT), kg(D/stand), kg(spk.)x2
Life: >25,000 hours
(elapsed time to 50% of initial brightness)
Dimensions(MNT) : 105.6cm wide, 63.4cm high, 8.2cm deep
Input Terminals : RF terminal(PAL/SECAM/NTSC)
(Set Top Box) Composite Video input(RCA) X 2, S-Video
Audio L&R input(RCA) X 2
Component Video (Y,Pb,Pr) + R/L for DVD
Component Video (Y,Pb,Pr)+ R/L for HDTV Stb.
RGB-SUB 15 pin for HDTV Stb.(480p/720p/1080i)
Analog RGB-SUB 15pin(PC VGA ~SVGA)
Stereo Input for PC Audio
Output Terminals : Analog RGB-SUB 15 pin(PC/DTV input bypass)
(Set Top Box) Audio L&R(RCA)
RGB-SUB 25 Pin for MNT(RGB/HV in & Control)
Composite Video output + R/L output
Input Terminals : Analog RGB-SUB 15 pin (Compatible with PC
(MNT) VGA ~SVGA, Compressed XGA)
RGB-SUB 25 Pin for STB(RGB/HV in & Control)
Component Video (Y,Pb,Pr) for DVD & DTV Stb.
Composite Video input(PAL/SECAM/NTSC)
Audio L&R input(RCA)X2
Display Frequency : 15.73kHz to 60kHz horizontally, 50Hz to 75Hz(V)
Picture : PIP(2Tuner:STB), Twin Picture, Digital Comb filter,
Digital Video Enhancer(Jagging free )
Sound : A2 stereo, AVL, Dolby Virtual, 2x10Wrms
Remote Control : Included(Unified)
External Control : D-sub 25-pin connector
Power Source : 110-240V , 50/60 Hz
Power Consumption: 300 watts( with Max. Audio : 320W)
MN-42PZ10(42”W PDP MNT)
Market : Korea / N_ America / S_America
(2001. July ~)
Spec of Models
RN-BA11(3 System Multi STB)
430(W)X78(H)X280mm(D)
(Example of Desk Top Type)

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DIGITAL SET TOP BOX ( SK-011T )
DIGITAL SET TOP BOX ( SK-010T )
ANALOG SET TOP BOX ( RN-BA10 )
ANALOG SET TOP BOX ( RN-BA11 )
MN-40PA10, MN-40PA10A only
MN-42PZ10 only
MN-40X3M , MN-40PA10, MN-40PA10A, MN-42PZ10, MN-60PZ10
MN-40PA10, MN-40PA10A, MN-42PZ10, MN-60PZ10
All but MN-40X3M can be used
SET TOP BOX Compatible Model
Only related model can be used.
Only related model can be used
all Model can be connected but because of noise problem with internal
fan, it is terminated.Be sure that MN-40X3M is not compatible with SK-011T
Separately : dedicated cable (AP-EA10)
separately : dedicated cable (AP-EA10)
PDP STB type & compatible model

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P3 P2
VR2 VR1 VR1
Y SUS B/D ASSY CTRL B/D ASSY
ZSUS B/D ASSY
X RIGHT B/D ASSY
Label
P2
P100
P300
P1
X LEFT B/D ASS’Y
P4
P6
P5
Y
DRV
Upper
B/D
ASSY
Y
DRV
Lower
B/D
ASSY
P1
P2
Ⅱ. Module diagram & spec
PART NO. product name standard
1 6871QTH003B PWB(PCB) ASSY ZCNT TOP B/D ASSY
2 6871QZH002B PWB(PCB) ASSY ZSUS B/D ASSY
3 6871QTH004B PWB(PCB) ASSY ZCNT BOTTOM B/D ASSY
4 6871QLH012A PWB(PCB) ASSY X LEFT BOTTOM B/D ASSY
5 6871QRH010A PWB(PCB) ASSY X RIGHT BOTTOM B/D ASSY
6 6871QDP016B PWB(PCB) ASSY YDRV Upper B/D ASSY
7 6871QDP017B PWB(PCB) ASSY YDRV Lower B/D ASSY
8 6871QYH015A PWB(PCB) ASSY YSUS B/D ASSY
YDRV B/D ASSY
ZCNT TOP B/D ASSY
ZCNT BOTTOM B/D ASSY
EXTERNAL CABLE CONNECTION
connector supply signal
P1~P2[X B/D] 5V, 15V, VA
P3[Y SUS B/D] VSC, VSETUP
P2[Y SUS B/D] 5V, 15V, VS
P1[Z SUS B/D] 5V, 15V, VS
P300[CTRL B/D] 5V
P100[CTRL B/D] VIDEO SIGNAL

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Y- Board
Controller
Board
Z- Board
CN1
CN2
Local key
EMI Filter
VSC
Board
POWER
Board
X – Board ( R )
X – Board ( L )
Y-
Drive
Y-
Drive
Main Power

10/79
STB
PC
Video
DVD
LA7222
VPC3230 SDA9410 CXA2101 THS8083
CXA2022S
MX88L284
Buffer
HC541
LA4282
MICOM
CXP750010
HC74
PDP
MPDULE
2M-SDRAM
Monitor Block diagram

11/79
MICOM
EEPROM
X2416P
VIDEO
SWITCH
(M52758FP)
AUDIO
L
R
AUDIO AMP
LA4282(L&R)
5
5
RGBHV
RGBHV 3
H/V
SOG
COLOR DECODER
(VPC3230D)
DEINTERLACE
(FLI2200)
MEMORY
(4M-BYTE)
ENHANCER
(FLI2220) COLOR CONTROL
&
VIDEO SWITCH
(CXA2101Q)
3
Y,Pb,Pr(STB)
3
Y,Pb,Pr(MNT)
A/D CONVERTER
(CXA3516R) SCALER
(JAG200)
MEMORY (6M-BYTE)
EPLD
(GEN. CLAMP)
Buffer
(74F574 x 4)
H
V
Clamp
2
H/V
H
H
V
2
PLLH/CLK
5
H/V/CLK/
HBLK/VBLK
4
H/V/DE/CLK
DISP_EN
5
RGBHV
3
RGB
3
RGB
5
Y,U,V,H,V
Sound
Processor
(MSP3401G)
2
H/V
MONOSTALE MULTIBIB.
SOG_OUT CLAMP_AD
PORT EXP
(M62320X3)
ROM
(AT29C010)
(74HCT373)
YCbCr/
YPbPr
CVBS
2
YUV
41P
8
4
H/V/
FIELD/
LLC1
MN-42PZ10 VSC(JAG200 & FLI2200) Block Diagram

12/79
TUNER.1
외부입력1
CXA2069Q
A/V SW
V, L/R
V, L/R
S-VHS
Y / C
※ AUDIO 공용
MSP3401G
Sound
Processor
2’nd SiF
L/R(tv)
DVD/DTV
(RCA JACK)
VPC3230D
(MAIN)
Vido
Proessor
Y,Cr,Cb (DVD)
DVD_Y
VPC3230D
(SUB)
Video
Proessor
MS81V04160
FRAME
MEMORY
PC
L / R
Y,Pb,Pr(DTV)
Y,Pb,Pr(DTV)
RGB(PC)
CVBS
RGB
M52758FP
RGB/YUV
S/W
DCF
RE
WE
RN-BA11(Tuner Receiver) Block - Diagram Ro
Lo
Y/C
외부입력2
MNT_OUT
CVBS
Y/C
OPTION
TUNER.2
TV (M)
TV (S)
L/R(tv)
Y/C
M52756FP
RGB/YUV
S/W
RGB (DTV)
RGB(OSD)
LGTV1001
DRP
CXA2119M
S/W
+
YUV
L/R

13/79
Connecting 25 Pin cable
(when connecting 25 Pin cable,
Connect external equipment to STB)
Product back & monitor in/output section

14/79
Power Board
Y-Drive (TOP)
Y-Board
VSC Board
Y-Drive (Bottom)
Z-Board
Controller Board
EMI Filter
Connection diagram (back cover’s open)

15/79
BACK COVER
POWER BOARD
VSC BOARD EMI Filter
Exploded view (Back Cover, VSC, EMI, Power )

16/79
PANEL
Y-BOARD
Z-BOARD
CONTROL
BOARD
X-BOARD
X-BOARD
Y-Drive BOARD
Y-Drive BOARD
Exploded view (Module)

17/79
VSC Board(Front) EMI Filter
Power Board Z- Board
Y-Board Control Board(Back)
Y-Drive Board (Top)
Y-Drive Board
Main Power
Switch
Parts (back covers open)

18/79
X-Board ( Right)
X-Board ( Left )
Control Board Z-Board
Y-Board
Y-Drive Board
EMI Filter & VSC Board are separated

19/79
Power well power Board-Korean market Murata Power Board
Power Board ( SMPS )

20/79
1. The 4/7 or 3/7 of screen is not displayed.
1) Check the X B/D power connector.
2) Check the connector between CTRL B/D and X B/D.
3) Replace the X B/D.
※ relations between screen and X B/D
screen X B/D
left 4/7 of screen  Right X B/D
right 3/7 of screen  Left X B/D
※ type
i) screen’s left(4/7) ii) Screen’s right(3/7)
Non-displaying part
Displaying part
Ⅲ. Screen defect diagnosis

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2. No image by Data COF. (the case one Data COF is totally or partially not displayed included)
1) It is mainly caused by related Data COF and X B/D connection error.
2) Check the connector between that Data COF & X B/D.
3) When Data COF has a defect, replace the related X B/D.
※ examples of screen display type
( beside the below, any out of 7 Data COF can be occurred. )
partially displaying
ok
Non-image
Set  pattern( GND ) to ANODE,
 Pattern (resistance joint part ) to CATHOD,
Test diode forward and backward.
Measure ③ resistance value.(10Ω)
 GND

resistance
※ Data COF IC test method

22/79
3. Data COF IC unit error
1) As pictures below, this is caused by the clock error of Data COF IC
2) With <case 1>, <case 2>, <case 3>, check Data COF connector and replace the X B/D.
3) With <case 4>, <case 5>, check the connector between CTRL B/D & X B/D and replace X B/D or CTRL B/D.
※ Cases
Two every-second IC error in one
<case 1>
4 IC errors in one COF
<case 2>
Data COF IC unit error in the whole X B/D
<case 3>
Data COF IC unit error in the whole screen.
<case 4>
One IC error in one COF
<case 5>

23/79
※ case
Partial error or total error with One or more ICs
defect.
4. Regular vertical line with one or more Data COF IC
1) Regular vertical line with one Data COF IC is mainly caused by X B/D output terminal buffer’s output error. When two Data COF ICs have regular
vertical lines, it means the data transfer from Controller B/D to X B/D has an error.
2) Check the related X B/D connector.
3) Replace that X B/D or CTRL B/D
screen X B/D
left 4/7 of bottom screen  Right X B/D
right 3/7 of bottom screen  Left X B/D
※ relation between screen & X B/D

24/79
5. The screen by Scan FFC is not displayed
1) It is mainly caused by the bad connection between Scan FFC & Y B/D.
2) Check the related connector between Scan COF & Y B/D.
3) When Scan IC has a defect, replace the related Y DRV B/D.
※ case 1/8 of the screen
total or partial non- image
※ SCAN IC check
Set Vpp Pin to ANODE, GND pin to CATHOD and test diode forward and backward.
OK
●
●
●

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6. Regular vertical lines in the whole screen. (mainly in one specific color, regular line is flicking)
1) This problem is related to CONTROL B/D.
2) Replace CONTROL B/D
※case
Regular vertical lines in the whole screen
7. Vertical Data copy
1) It possibly happens when scan wave does not form properly.
2) Replace Y DRVB/D or Y SUS B/D
※ case
<pattern supposed to display>
<case2 : partial- top copy> <case 3 : partial- bottom copy> <case 4 : total copy>
<case 1 : total copy>

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8. One or more vertical lines in the screen.
1) Irregular vertical line is not related to Controller B/D or X B/D.
2) It is mainly caused by the followings open(or short).
- Panel itself defect
- DATA COF FPC attached to panel is open or short.
- DATA COF attached to panel itself defect
3) Replace module
※ case
There are several types.
Several lines in ¼ area.
It can be seen on the both side, right and left.
The area is sometimes over ¼.
9. One or more horizontal lines in the screen.
1) Irregular borizontal line is not related to Controller B/D or Y B/D.
2) It is mainly caused by the followings open(or short).
- Panel itself defect
- SCAN FPC attached to panel is open or short.
- SCAN IC attached to panel itself defect
3) Replace Y DRV B/D
※ case
Not always like this.
There can be several horizontal lines

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10. Input signal pattern is displayed but the whole brightness of the screen is dark.
1) It happens when Z B/D is not operating well.
2) Check whether Z B/D’s power connector is plugged .
3) Check whether the connector between Controller B/D & Z B/D is plugged.
4) Replace Controller B/D or Z B/D.
11. In full white pattern, foreign color is displayed or in full black pattern, mis-discharge
is partially occurred.
1) Check the slope of Y B/D set up, set down waveform.
2) Check the slope of Z B/D’s ramp waveform
3) Measure each B/D’s output waveform by over 200MHz oscilloscope and compare it to the below picture.
it is possible to control Y B/D’s setup slope by adjustinng VR2, setdown slope by VR1 and Z B/D’s ramp slope by VR1..
- Y B/D measurement point : TP ( Connector P4 36 pin )
- Z B/D measurement point : panel connection part ( SUS_OUT )
setup
setdown
230s
25s
230V
Vsetup
175V
Vs
Y output voltage wave
175V
Vs
15s
20s
Z RAMP voltage wave
0V

28/79
13. A specific brightness of one color is not clear.
1) Check CTRL B/D’s input signal connector.
2) Replace CTRL B/D.
12. In full white pattern, the brightness is getting darker toward the center.
1) It happens with Z B/D’s ramp waveform
2) Check the connection between CTRL B/D and Z B/D’s connection cable.
3) Replace Z B/D.
※ case

29/79
Non- image or same symptom when power off or black pattern.
1) Check CTRL B/D’s LED(D1~D4).
2) Check the power or signal cable input into CTRL B/D.
3) Check X B/D, Y B/D and Z B/D’s power connector.
4) Check the connector between CTRL B/D and X B/D, Y B/D, Z B/D respectively.
5) Measure each X, Y, Z B/D’s output waveform with over 200MHz oscilloscope and compare it to the below picture to detect the defect
and replace that.
- Y B/D measurement point : TP ( Connector P4 36 pin )
- Z B/D measurement point : panel connection part ( SUS_OUT )
- X B/D measurement point : L1(RIGHT), L2(LEFT BOTTOM)
< A: Y B/D output waveform - 1 FRAME >
< B: Y B/D output waveform - 1 SF >
1Frame(16.7ms)
Ⅳ. Non-picture Defect diagnosis.
5) Test scan(Y) IC.
6) Test data(X) COF IC.
7) Replace CTRL B/D.
< B: Y B/D output waveform - 2 SF(non-Setup SF) >
6)Test scan(Y) IC.
7)Test data(X) COF IC
8)Replace CTRL B/D.

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< B: Y B/D output waveform - 7~12 SF(SE) >
< B: Z B/D output waveform - 1SF >
< A: Z B/D output waveform - 1Frame >
< A: Y B/D output waveform - 1Frame >
< X B/D output waveform - 1 FRAME >
< X B/D output waveform - amplification >
< X B/D output waveform - 1 SF >

31/79
P6
P4
Rework should
be done
Y-Driver Board
Y-Board
42” PDP Flicker and No Raster Troubleshooting Guide
cause : bad connection between
Y-Board
# 1, 2 drive board Connector pin
Ⅴ. One Point Service Guide 42 Inch

32/79
amplified amplified
① : outside Leg
② : inside Leg
•P 6, P 4 both are the first pin, when
wiring, it should be done as picture
shown.
(bend the wire to Y-Driver B/D not
to Y-B/D . If not there can be noise)
•Don’t be confused with Pin number
•Improved since Dec,2001.
P 4 ①
②
②
①
①
②
①
②
①
②
②
①
P 6

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②
①
②
②
①
①
②
①
Be sure not to misconnect the line.
See the picture precisely and then connect jump wire at the exact point

34/79
X CANVAS X CAVBAS
Intermittent no-image/image error while watching
The screen is intermittently disappeared . LED is green screen is distorted weiderly (happened 2 a day)
normal
cause : bad connection between Y-Board and #1, 2 pin of
Y-Drive Board Connector
troubleshooting : connect bad linking between Y-Board &
Y-Drive with jump wire (all 4 parts)
see working instruction(revised since Dec,2001. 1)
CANVAS
X

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X CANVAS
normal
CANVAS
X
No Power
( in ST-BY mode, but no LED)
Check the power supply & main power S/W on
Check EMI board fuse (check the rated capacity )
No Power
Fuse 15 A
Be sure to use rated fuse.

36/79
X CAVBAS
normal
CANVAS
X
when Power’s on, after 2 ~ 3 sec, it’s off
( LED changing green into red )
CHECK : remove STB and operate monitor individually.
(check STB defect or Monitor defect )
When using ANALOG STB, check STB only
MN-42PZ10 only STB : RN-BA11
Remove each Board’s power supply connector and check the power is off.
When the power is not off,replace the related board.
No Raster

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X CANVAS
normal
CANVAS
X
no picture (LED’s green)
Core checkpoint : remove STB and operate monitor individually.
(check whether STB’s a defect or monitor’s one)
No Picture
With monitor defect, check VSC and then Controller Board.
Troubleshooting : replace VSC Board

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X CANVAS
normal
CANVAS
X
no image (LED’s green)
Cause : Y-Drive ( Bottom ) defect
Troubleshooting : Y-Drive (lower part) replacement
Address Bar ( Horizontal Bar )
Y-Drive Board ( Bottom )
This problem is shown in the bottom of screen,
So it is caused by Y-Drive

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X CANVAS
normal
CANVAS
X
Address Bar ( Horizontal Bar )
Y-Drive Board ( Top )
Cause : Y-Drive Board (upper part) defect
Troubleshooting : Y-Drive Board replacement

40/79
X CANVAS
normal
CANVAS
X
PD501 Connector
No Picture
cause : PD-501 Connector contact point defect
troubleshooting : PD-501 Connector replacement
(with PD-501 Connector contact point defect,
Various defect symptoms can be seen)

41/79
X CANVAS
normal
CANVAS
X
normal picture with high frequency noise (“bee”)
High frequency noise (“Bee” sound)
C8178 0.22uF
electrolytic
capacitor insertion
Open C8139 right
lead and then
wire R8164 right
lead
Power (SMPS) Board
1. C8178 0.22㎌/50V add
2. Open C8139 right lead,
and then connect it to
R8164 right lead.
Improved since Nov,2001
SMPS is supposed to operate
with high frequency so
small noise is not considered
as a defect.
#. Slight noise is not a defect and write down explanation

42/79
X CANVAS
normal
CANVAS
X
No picture in right- 2/5 area
No picture in the right- 2/5 area
X-Board ( Left ) power supply check
X-Board ( Left )Connector check
X-Board ( Left ) replacement

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X CANVAS
normal
CANVAS
X
Address Bar (Vertical )
stripe in right-2/5 area
X-Board ( Left ) power supply check
X-Board ( Left ) Connector check
X-Board ( Left ) replacement

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X CANVAS
normal
CANVAS
X
X-Board ( Right ) power supply check
X-Board ( Right )Connector check
X-Board ( Right ) replacement
left 3/5 of screen with vertical stripes
No picture in left 3/5 of the screen

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X CANVAS
normal
CANVAS
X
X-Board ( Right ) power supply check
X-Board ( Right )Connector check
X-Board ( Right ) replacement
Address Bar (Vertical )
left 3/5 of screen with vertical stripes.

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X CANVAS
normal
CANVAS
X
no Red ( B or G )
Be sure not to bend it by force or internal
Insulated conductor can be down.
Test Monitor individually.
If detect a problem with monitor, check VSC Board.
If it has a problem with STB connecting, focus on 25 Pin.
Be sure not to connect 5 Pin (AP-EA10) by force
25 Pin Cable P/No : GVZ AP-EA10
No Red

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Lift up the right and left of X-BOARD CONNECTOR. Lift up X-BOARD CONNECTOR and separate
COP CONNECTOR by pulling up.
When you handle COF CONNECTOR, don’t pressure. First release LOCK and separate.
If COF CONNECTOR is damaged, you should replace MODULE ASS’Y. So, be aware of this!!
1) X - Board COF Connector separation
When you exchange X-Board, first you should separate COF
Connector. Be careful to handle it.
COF Connector is attached to Module. When COF Connector is
broken, Module ASS’Y must be replaced a new one.
Warning
COF Connector
42 Inch

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Lift up each edge of left/right. Lifted condition
2) X - Board Connector separation
It’s easy to separate it by releasing Connector Lock .
Do not pressure or it can be hurt.
When LOCK is hurt, replace a new X-BOARD
Warning
Be careful to handle LOCK or it can be broken.
When LOCK is broken, replace a new X-BOARD.

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Pull the white LOCK as shown in arrow
Pull the white LOCK as shown in arrow.
Separate COF CONNECTOR by pulling in the left.
3) Y - Board COF Connector separation
Warning
Be careful to handle LOCK and COF Connector. When LOCK part is damaged, you should replace
a new Y-Board. In case of COF Connector, Module Assembly.

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4) Z - Board COF Connector separation
Separate the fixed Screw of Z-Board.
Pull out Lock as shown in arrow.
Condition in Lock part is pulled Pull COF Connector as shown in arrow.
It’s easy to separate COF on condition
that Z-Board Screw is separated.
In case Z-Board is assembled, it’s really
hard to separate.
Be careful not to tear COF Connector.
If COF Connector is torn, replace a new Module Assembly
Warning COF Connector

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Push LOCK and pull out
PUSH PUSH PUSH
5) Connector separation Guide
PUSH PUSH PULL

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6) Control Board & VSC Board Connector

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Be sealed up after gas injection
Be careful to handle the sealed-up part after gas injection.
If it is broken, the gas escapes. So, replace the Module.
7) Gas injection (Sealing up) condition
Warning
Be sealed up after gas injection

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Power is On and off 2~3 minutes.
(Protection)
P301 Connector Open Check. X - Board Top Right Change.
P302 Connector Open Check X - Board Top Left Change.
P303 Connector Open Check
X - Board Bottom Right Change.
X - Board Bottom Left Change.
Z - Board Change.
P3, P2 Connector Open Check Y - Board Change.
P005, P003 Connector Open Check
VSC- Board Change.
VSC - Board Change.
Sound Output IC Short Check
Power Board Change
OK
OK
OK
OK
OK
OK
OK
OK
PROTECT operation;
When the load voltage is short.
When each voltage doesn’t work (in general)
8) Power off in 2 ~ 3 minutes(Protection)

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L813 Cold Solder
Check
Open the Connector connecting to each Board to check the power is off.
if each Board is same, check the Power Board and voltage.
Symptom : As soon as the power on,
it’s off in 2 - 3minutes.
(PROTECT operation)
Cause : No VS voltage
L813 Coil cold soldering.
9) Power off in 2 ~ 3 minutes(Protection)

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MP-40PA10 uses 4 board such as left,right, top and bottom.
Divide the screen in 4 and once you see ADD BAR check COF CONNECTOR
between MODULE and X-BOARD.
If there is no defect in COF CONNECTOR replace X-BOARD.
But the problem still remains and check the connector between X-BOARD and
CONTROL BOARD. And if you can’t find defect, check CONTROL.
HEATRUN : WHITE
Press the ADJ KEY and check the position of add bar by changing WHITE or
RED or BLUE or GREEN
Top Right Top Left
Bottom Right Bottom Left
10) ADD BAR inspection and repair

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Symptom : B color 1 Address line Open
Cause : Dented COF
COF is dented
11) One Point Service Guide

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Symptom : Inferior R Address color
Cause : Inferior DATA output by cold soldering 16 pin of IC14 in X-L-TOP
( Normal waveform after tearing off IC Pin)
Countermeasure : Replace X-L-TOP board.
IC14
Cold Soldering
Abnormal waveform by cold soldering
Normal waveform after tearing off IC pin

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Check
The blue spreads on the screen (Mis-discharge)
and power off in 2 ~ 3 seconds.
If you turn on again, it will be same problem.
Symptom Causes Countermeasure
If 15V line voltage reduces
below 14V,
Mis-discharge occurs and
power off because of
protection circuit.
Replace PSU
(Power Supply Unit)
and defective X-Board.
If when Power on, screen shows like above and turn off in 2 seconds, check if turning off or not by disconnecting
all X & Y boards.
Defective X-Board

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Check
The top left part of screen is broken
(Top Right X-BOARD)
Symptom Cause Countermeasure
No 5V supply to Top right
X-Board.
Connect 5V line
Check Top right X-BOARD 5V.(If 0V, it happens)
Check 5V line from SMPS to X-BOARD.

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Check
Pinkish screen in the top left.
(Top right X-BOARD)
No Va(70V) supply to Top
right X-Board.
Connect 70V line
Check Top right X-BOARD Va(70V).(If 0V, it happens)
Check 70V(Va) line from SMPS to X-BOARD.

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Check
The 3/5 top left in the screen is blank
(Top Right X-BOARD)
Check Top right X-BOARD 12V.( If 0V, it happens )
Check Top right X-BOARD Va(70V).(If 0V, it happens)
Check 12V & 70V(Va) line from SMPS to X-BOARD.
No 12V supply to Top right
X-Board.
right X-Board.
Connect 12V line
Connect 70V line

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Check
The 3/5 top right of the screen is blank.
(Top left X-BOARD)
No 12V supply to Top left
X-Board.
left X-Board.
Connect 12V line
Connect 70V line
Check Top left X-BOARD 12V.( If 0V, it happens )
Check Top left X-BOARD Va(70V).(If 0V, it happens)
Check 12V & Va(70V) line from SMPS to X-BOARD.

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Check
Pinkish screen in the 1/5 top right
(Top left X-BOARD)
P1 COF connector on Top left
X-Board is open.
Reassemble it
Check the contact point and Locking of P1 on Top left X-BOARD.

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Check
The 3/5 bottom left of screen is broken.
(BOTTOM RIGHT X-BOARD)
No 5V supply to bottom right
X-Board.
Connect 5V line
Check Bottom right X-BOARD 5V.( If 0V, it happens )

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Check
The 3/5 bottom left of the screen is Blank.
(Bottom Right X-BOARD)
Check Bottom right X-BOARD 12V.( If 0V, it happens )
No 12V supply to bottom right
X-Board.
No Va(70V) supply to bottom
right X-Board.
Connect 12V line

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Check
The 2/5 right of the screen is broken.
(Bottom left X-BOARD)
Check Bottom left X-BOARD 5V.( If 0V, it happens )
No 5V supply to bottom left
X-Board.
Connect 5V line

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Check
The 2/5 right part of the screen is blank.
(Bottom left X-BOARD )
No 12V supply to bottom left
X-Board.
Connect 12V line
Check Bottom left X-BOARD 12V.( If 0V, it happens )

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Check
ADDRESS bar appears in the right bottom of the screen.
(X-BOARD BOTTOM LEFT)
The connecting of X-Board bottom
left connector is bad.
Reassemble it.
Check connecting of the connector of bottom left X-BOARD.
Reassemble it.
X-BOARD BOTTOM LEFT CONNECTOR
OPEN.

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Examples

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Check
Screen is divided in top and bottom, and vertical bar
appears.
Connector(P13) is OPEN or
Connecting condition is bad
Reassemble P13.
P13 CONNECTOR contact point inferior CHECK.
P13 CONNECTOR SIGNAL CHEK.
P13 CONNECTOR

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Check
Screen is broken and has the vertical/horizontal bar.
VSC Board Connector is Open. Reassemble VSC Board
Connector
Check the connector connecting
Reassemble the Connector

73/79
Check
The screen is bluish(Mosaic screen)
Loose VSC Board Connector Reassemble VSC BOARD
Connector
Check the connection condition of the Connector.
Reassemble the Connector.

74/79
Check
The mosaic appears in the screen when it connects to VIDEO Input.
(The sensibility of Y-signal is low.)
When connected to Component Input, it is O.K.
Bad IC203 Replace IC203(VPC3230D)
Check if X201 on VSC board oscillates.
Check Video In/Out of IC203 on VSC board.
IC201
(VPC3230D)
Decoder IC

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IC201(VPC3230D) Decoder is inferior
Examples

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Check
Noise with division of colors
Bad Connector connecting
Control Board and VSC B/D.
Contact point and signal condition of Connector Control Board and VSC Board.
Abnormal Normal
Bad Connector
Symptom
Cause
Countermeasure
Change the Connector

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Name No signal Vertical Bar
Symptom Cause and Countermeasure
Realization
1.Cause : Bad IC2 (DA1)
8cm
When ASIC Chip(IC2 DA1 LGD4001) on Control Board gets
high temperature, you can observe it
(In normal temperature it’s O.K. )
▶ IC2 DA1(Data Arrange) No.162 Pin output is changing
depending on the temperature.⇒ abnormal X-B’d Buffer IC
* Room temperature : 2.5V Output (Normal Pin = over 2.8V)
* Heated : 1.5V Output(Normal Pin = 2.7V )
⇒ Bad IC2 (DA1)
< Waveform of normal pin>
─ heated
< Waveform of abnormal
pin >
─ heated
DA1
Buffer
DA1
Buffer
Buffer(74ACT541) waveform abnormally narrows.
→In this case, it is impossible for Flip Flop(74AC574) on X
B/D to read data.
2. Countermeasure : Replace IC2

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Name Add Open (Green 1 Line)
1.cause: Add. COF Drive IC inferior
Normal Line Data waveform Open Line Data output waveform
▶ the output of inferior line less than that of the normal Line
Add. COF Drive IC inferior
▶ COF inspection검사기 : 24V Open check (normal 50V)
Add. COF Drive IC

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Name Vertical bar when Power off/on(Mis-discharge)
Realization
1.PDP Power on Mode external input
(regardless of wire/wireless signal but it’s easy to reenact in wireless
signal)
2. Remove Power Cord (Power’s off)
3.after about 20minutes, insert Power cord
(automatically the Power’s on and the vertical bar is shown as above)
1.Cause : Control board malfunctions when Power off/on.
2.Countermeasure: Change some parts on Control board.
3.Changing parts : A32_CTRL_03 B/D (Marked on PCB)
-.R14,17,18,21 : 330 ==> 4.7K (Chip Resistor)
-.R15,16,19,20 : 22K ==> 4.7K (Chip Resistor)
-.C504, 505 : 0.1uF / 50V add (Chip Capacitor)
Control board

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