Post on 10-Apr-2018
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42424242 Inch(Wide)Inch(Wide)Inch(Wide)Inch(Wide) PDP SVC Training ManualPDP SVC Training ManualPDP SVC Training ManualPDP SVC Training Manual
LG Electronics / DND QA
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ContentsContentsContentsContents
. Usage/Service Points to be concerned
. Module formation & spec
. 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.
. Non-picture defect diagnosis
. One Point Service Guide(42 Inch, 40 Inch)
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.... Usage/Service points to be concernedUsage/Service points to be concernedUsage/Service points to be concernedUsage/Service points to be concerned
SUGGGESTIONS
1. Static precautionDrive section circuit is C-MOS circuit, so to protect against static electricity, wear static-proof wrist band.
2. Cleaningwhen wiping panel, do not use liquid cleaner or other chemicals . Use a damp cloth for cleaning .
3. handlingColor PDP uses high voltage(Max.500V). Be aware of electronic shock when handling PDP Unit and dont touch drive circuit.and even driver circuits 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 guaranteeGlass 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 imageColor 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 & ventilationColor PDPs 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 Modulebe 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 glasss 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 andPCB section. We call this concrete as PDP Module Assy 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 PCB3. 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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ITEMS SPECIFICATIONS(Tentative)
Screen Size: 42 inch/ 106cm diagonalAspect Ratio: 16 :9 (width:height)Resolution: 852 x 480 Pixels(SD grade)Peak Brightness : typ.240cd/m (with filter 60%)Contrast Ratio: 700:1(Dark Room & with filter 45%)Viewing Angle: 160 horizontally and verticallyDisplayable Colors: 16.7 millionWeight: kg (MNT), kg(D/stand), kg(spk.)x2Life: >25,000 hours
(elapsed time to 50% of initial brightness)Dimensions(MNT) : 105.6cm wide, 63.4cm high, 8.2cm deepInput Terminals : RF terminal(PAL/SECAM/NTSC)(Set Top Box) Composite Video input(RCA) X 2, S-Video
Audio L&R input(RCA) X 2Component Video (Y,Pb,Pr) + R/L for DVDComponent 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 AudioOutput 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, 2x10WrmsRemote Control : Included(Unified)External Control : D-sub 25-pin connectorPower Source : 110-240V , 50/60 HzPower Consumption: 300 watts( with Max. Audio : 320W)
MN-42PZ10(42W PDP MNT)
Market:Korea / N_ America / S_AmericaMarket:Korea / N_ America / S_AmericaMarket:Korea / N_ America / S_AmericaMarket:Korea / N_ America / S_America(2001.July~)(2001.July~)(2001.July~)(2001.July~)
Spec of ModelsSpec of ModelsSpec of ModelsSpec of Models
RNRNRNRN----BA11(3SystemMulti STB)BA11(3SystemMulti STB)BA11(3SystemMulti STB)BA11(3SystemMulti STB)430(W)X78(H)X280mm(D)
((((Exampleof DeskTopType)Exampleof DeskTopType)Exampleof DeskTopType)Exampleof DeskTopType)
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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 ASSY
P4
P6
P5
YD
R
VUpper
B/DA
SSY
YD
RVLowerB
/DA
SSY
P1
P2
.... Module diagram & specModule diagram & specModule diagram & specModule diagram & spec
PART NO. product name standard1 6871QTH003B PWB(PCB) ASSY ZCNTTOPB/D ASSY2 68 71QZH002B PWB(PCB) ASSY ZSUSB/D ASSY
3 68 71QTH004B PWB(PCB) ASSY ZCNTBOTTOMB/D ASSY4 68 71QLH012A PWB(PCB) ASSY X LEFTBOTTOMB/D ASSY5 68 71QRH010A PWB(PCB) ASSY XRIGHTBOTTOMB/D ASSY
6 68 71QDP016B PWB(PCB) ASSY YDRVUpper B/D ASSY7 68 71QDP017B PWB(PCB) ASSY YDRV Lower B/D ASSY8 68 71QYH015A PWB(PCB) ASSY YSUSB/D ASSY
YDRV B/D ASSY
ZCNT TOP B/D ASSY
ZCNT BOTTOM B/D ASSY
EXTERNAL CABLE CONNECTIONEXTERNAL CABLE CONNECTIONEXTERNAL CABLE CONNECTIONEXTERNAL CABLE CONNECTION
connector supply signal
P~P2[XB/D] 5V, 5V,VAP3[YSUSB/D] VSC,VSETUPP2[YSUSB/D] 5V, 5V,VS
P[ZSUSB/D] 5V, 5V,VSP300[CTRL B/D] 5VP00[CTRL B/D] VIDEOSIGNAL
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YYYY---- BoardBoardBoardBoard
ControllerControllerControllerControllerBoardBoardBoardBoard
ZZZZ---- BoardBoardBoardBoard
CN1CN1CN1CN1
CN2CN2CN2CN2
Local keyLocal keyLocal keyLocal key
EMI FilterEMI FilterEMI FilterEMI Filter
VSCVSCVSCVSCBoardBoardBoardBoard
POWERPOWERPOWERPOWERBoardBoardBoardBoard
XXXX Board(R)Board(R)Board(R)Board(R)XXXX Board( L )Board( L )Board( L )Board( L )
YYYY----
Drive
Driv
e
Drive
Driv
e
YYYY----
Drive
Drive
Drive
Drive
MainPowerMainPowerMainPowerMainPower
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STBSTBSTBSTBSTBSTBSTBSTB
PCPCPCPCPCPCPCPC
VideoVideoVideoVideoVideoVideoVideoVideo
DVDDVDDVDDVDDVDDVDDVDDVD
LA7222LA7222LA7222LA7222LA7222LA7222LA7222LA7222
VPC3230VPC3230VPC3230VPC3230VPC3230VPC3230VPC3230VPC3230 SDA9410SDA9410SDA9410SDA9410SDA9410SDA9410SDA9410SDA9410 CXA2101CXA2101CXA2101CXA2101CXA2101CXA2101CXA2101CXA2101 THS8083THS8083THS8083THS8083THS8083THS8083THS8083THS8083
CXA2022SCXA2022SCXA2022SCXA2022SCXA2022SCXA2022SCXA2022SCXA2022S
MX88L284MX88L284MX88L284MX88L284MX88L284MX88L284MX88L284MX88L284BufferBufferBufferBuffer
HC541HC541HC541HC541
BufferBufferBufferBuffer
HC541HC541HC541HC541
LA4282LA4282LA4282LA4282LA4282LA4282LA4282LA4282
MICOMMICOMMICOMMICOM
CXP750010CXP750010CXP750010CXP750010
HC74HC74HC74HC74HC74HC74HC74HC74
PD
P
MPDULE
PD
P
MPDULE
PD
P
MPDULE
PD
P
MPDULE
2222MMMM----SDRAMSDRAMSDRAMSDRAM2222MMMM----SDRAMSDRAMSDRAMSDRAM
Monitor Block diagramMonitor Block diagramMonitor Block diagramMonitor Block diagram
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MICOM
EEPROMX2416P
VIDEOSWITCH
(M52758FP)
AUDIO
L
RAUDIO AMPLA4282(L&R)
5
5
RGBHV
RGBHV 3
H/VSOG
COLOR DECODER
(VPC3230D)
DEINTERLACE
(FLI2200)
MEMORY(4M-BYTE)
ENHANCER
(FLI2220) COLOR CONTROL&
VIDEO SWITCH
(CXA2101Q)
3Y,Pb,Pr(STB)3Y,Pb,Pr(MNT)
A/D CONVERTER
(CXA3516R) SCALER
(JAG200)
MEMORY (6M-BYTE)
EPLD
(GEN. CLAMP)
Buffer(74F574 x 4)
H
V
Clamp
2H/V
H
HV
2PLLH/CLK
5
H/V/CLK/HBLK/VBLK
4
H/V/DE/CLK
DISP_EN
5
RGBHV
3RGB
3RGB
5Y,U,V,H,V
SoundProcessor
(MSP3401G)
2H/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
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TUNER.1
1
CXA2069Q
A/V SWV, L/R
V, L/R
S-VHSY / C
AUDIO
MSP3401G
SoundProcessor
2nd SiF
L/R(tv)
DVD/DTV(RCA JACK)
VPC3230D(MAIN)
VidoProessor
Y,Cr,Cb (DVD)
DVD_Y
VPC3230D(SUB)
VideoProessor
MS81V04160FRAME
MEMORY
PCL / R
Y,Pb,Pr(DTV)
Y,Pb,Pr(DTV)
RGB(PC)
CVBS
RGB
M52758FPRGB/YUV
S/W
DCF
RE
WE
RN-BA11(Tuner Receiver) Block - DiagramRN-BA11(Tuner Receiver) Block - Diagram Ro
Lo
Y/C2
MNT_OUT
CVBS
Y/C
OPTION
TUNER.2
TV (M)
TV (S)L/R(tv)
Y/C
M52756FPRGB/YUV
S/W
RGB (DTV)
RGB(OSD)
LGTV1001DRP
CXA2119MS/W
+
YUV
L/R
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Connecting25Pin cableConnecting25Pin cableConnecting25Pin cableConnecting25Pin cable(when connecting25Pin cable,(when connecting25Pin cable,(when connecting25Pin cable,(when connecting25Pin cable,Connectexternal equipmenttoSTB)Connectexternal equipmenttoSTB)Connectexternal equipmenttoSTB)Connectexternal equipmenttoSTB)
Product back & monitor in/output sectionProduct back & monitor in/output sectionProduct back & monitor in/output sectionProduct back & monitor in/output section
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Power BoardPower BoardPower BoardPower BoardYYYY----Drive(TOP)Drive(TOP)Drive(TOP)Drive(TOP)
YYYY----BoardBoardBoardBoard
VSCBoardVSCBoardVSCBoardVSCBoard
YYYY----Drive(Bottom)Drive(Bottom)Drive(Bottom)Drive(Bottom)
ZZZZ----BoardBoardBoardBoard
Controller BoardController BoardController BoardController Board
EMI FilterEMI FilterEMI FilterEMI Filter
Connection diagram (back coverConnection diagram (back coverConnection diagram (back coverConnection diagram (back covers open)s open)s open)s open)
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BACKCOVERBACKCOVERBACKCOVERBACKCOVER
POWERBOARDPOWERBOARDPOWERBOARDPOWERBOARDVSCBOARDVSCBOARDVSCBOARDVSCBOARD EMI FilterEMI FilterEMI FilterEMI Filter
Exploded view (Back Cover, VSC, EMI, Power )Exploded view (Back Cover, VSC, EMI, Power )Exploded view (Back Cover, VSC, EMI, Power )Exploded view (Back Cover, VSC, EMI, Power )
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PANELPANELPANELPANEL
YYYY----BOARDBOARDBOARDBOARD
ZZZZ----BOARDBOARDBOARDBOARD
CONTROLCONTROLCONTROLCONTROL
BOARDBOARDBOARDBOARD
XXXX----BOARDBOARDBOARDBOARD
XXXX----BOARDBOARDBOARDBOARD
YYYY----DriveBOARDDriveBOARDDriveBOARDDriveBOARD
YYYY----DriveBOARDDriveBOARDDriveBOARDDriveBOARD
Exploded view (Module)Exploded view (Module)Exploded view (Module)Exploded view (Module)
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VSCBoard(Front)VSCBoard(Front)VSCBoard(Front)VSCBoard(Front) EMI FilterEMI FilterEMI FilterEMI Filter
Power BoardPower BoardPower BoardPower Board ZZZZ---- BoardBoardBoardBoardYYYY----BoardBoardBoardBoard Control Board(Back)Control Board(Back)Control Board(Back)Control Board(Back)YYYY----DriveBoard(Top)DriveBoard(Top)DriveBoard(Top)DriveBoard(Top)
YYYY----Drive BoardDrive BoardDrive BoardDrive Board
MainPowerMainPowerMainPowerMainPowerSwitchSwitchSwitchSwitch
Parts (back covers open)Parts (back covers open)Parts (back covers open)Parts (back covers open)
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XXXX----Board(Right)Board(Right)Board(Right)Board(Right)XXXX----Board( Left)Board( Left)Board( Left)Board( Left)
Control BoardControl BoardControl BoardControl Board ZZZZ----BoardBoardBoardBoardYYYY----BoardBoardBoardBoardYYYY----DriveBoardDriveBoardDriveBoardDriveBoard
EMI Filter & VSC Board are separatedEMI Filter & VSC Board are separatedEMI Filter & VSC Board are separatedEMI Filter & VSC Board are separated
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Pow er w el l pow er Board-K orean m ark et Murat a Pow er Board
Power Board ( SMPS )Power Board ( SMPS )Power Board ( SMPS )Power Board ( SMPS )
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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) screens left(4/7) ii) Screens right(3/7)
Non-displaying part
Displaying part
.... 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 x pattern( GND ) to ANODE,
y Pattern (resistance joint part ) to CATHOD,
Test diode forward and backward.Measure resistance value.(10)
x GNDyresistance
Data COF IC test method
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3. Data COF IC unit error
1) As pictures below, this is caused by the clock error of Data COF IC
2) With , , , check Data COF connector and replace the X B/D.
3) With , , 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
4 IC errors in one COF
Data COF IC unit error in the whole X B/D
Data COF IC unit error in the whole screen.
One IC error in one COF
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casePartial 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 buffers output error. When two Data COF ICs have regularvertical 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
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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
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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
caseThere are several types.
Several lines in area.It can be seen on the both side, right and left.
The area is sometimes over .
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/Ds 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-dischargeis partially occurred.
1) Check the slope of Y B/D set up, set down waveform.
2) Check the slope of Z B/Ds ramp waveform
3) Measure each B/Ds output waveform by over 200MHz oscilloscope and compare it to the below picture.
it is possible to control Y B/Ds setup slope by adjustinng VR2, setdown slope by VR1 and Z B/Ds 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
setdown230s
25s
230V
Vsetup
175V
Vs
Y output voltage wave
175V
Vs
15s
20s
Z RAMP voltage wave
0V
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13. A specific brightness of one color is not clear.
1) Check CTRL B/Ds 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/Ds ramp waveform
2) Check the connection between CTRL B/D and Z B/Ds connection cable.
3) Replace Z B/D.
case
NNNN iiii D f di iD f di iD f di iD f di i
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Non- image or same symptom when power off or black pattern.1) Check CTRL B/Ds 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/Ds 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/Ds 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)
.... NonNonNonNon----picturepicturepicturepicture Defect diagnosis.Defect diagnosis.Defect diagnosis.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 IC8)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 >
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amplified amplified
: outside Leg
: inside Leg
P 6, P 4 both are the first pin, whenwiring, 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)
Dont be confused with Pin number
Improved since Dec,2001.
P 4
P 6
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Besurenottomisconnectthe line.Besurenottomisconnectthe line.Besurenottomisconnectthe line.Besurenottomisconnectthe line.Seethepicturepreciselyandthen connectjumpwireattheexacSeethepicturepreciselyandthen connectjumpwireattheexacSeethepicturepreciselyandthen connectjumpwireattheexacSeethepicturepreciselyandthen connectjumpwireattheexactpointtpointtpointtpoint
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X CANVAS X CAVBAS
Intermittent noIntermittent noIntermittent noIntermittent no----image/image error while watchingimage/image error while watchingimage/image error while watchingimage/image error while watching
Thescreen is intermittentlydisappeared. LED isgreenThescreen is intermittentlydisappeared. LED isgreenThescreen is intermittentlydisappeared. LED isgreenThescreen is intermittentlydisappeared. LED isgreen screen isdistortedscreen isdistortedscreen isdistortedscreen isdistortedweiderlyweiderlyweiderlyweiderly (happened2aday)(happened2aday)(happened2aday)(happened2aday)
normalnormalnormalnormal
cause:bad connectionbetweenYcause:bad connectionbetweenYcause:bad connectionbetweenYcause:bad connectionbetweenY----Boardand#1,2pinofBoardand#1,2pinofBoardand#1,2pinofBoardand#1,2pinofYYYY----DriveBoardConnectorDriveBoardConnectorDriveBoardConnectorDriveBoardConnector
troubleshooting: connectbad linkingbetweenYtroubleshooting: connectbad linkingbetweenYtroubleshooting: connectbad linkingbetweenYtroubleshooting: connectbad linkingbetweenY----Board &Board &Board &Board &YYYY----Drivewithjumpwire (all 4parts)Drivewithjumpwire (all 4parts)Drivewithjumpwire (all 4parts)Drivewithjumpwire (all 4parts)
seeworking instruction(revisedsince Dec,2001.1)seeworking instruction(revisedsince Dec,2001.1)seeworking instruction(revisedsince Dec,2001.1)seeworking instruction(revisedsince Dec,2001.1)
CANVASX
N PN P
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X CANVAS
normalnormalnormalnormal
CANVASX
NoPowerNoPowerNoPowerNoPower
( inST( inST( inST( inST----BYmode,butno LED)BYmode,butno LED)BYmode,butno LED)BYmode,butno LED)
Checkthepower supply&mainpower S/WonCheckthepower supply&mainpower S/WonCheckthepower supply&mainpower S/WonCheckthepower supply&mainpower S/Won
Check EMIboardfuse(checkthe rated capacity)Check EMIboardfuse(checkthe rated capacity)Check EMIboardfuse(checkthe rated capacity)Check EMIboardfuse(checkthe rated capacity)
No PowerNo PowerNo PowerNo Power
Fuse 15 AFuse 15 AFuse 15 AFuse 15 A
Besuretouse ratedfuse.Besuretouse ratedfuse.Besuretouse ratedfuse.Besuretouse ratedfuse.
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X CAVBAS
normalnormalnormalnormal
CANVASX
whenPowerwhenPowerwhenPowerwhenPowerson, after 2~3sec, itson, after 2~3sec, itson, after 2~3sec, itson, after 2~3sec, itsoffsoffsoffsoff
( LED changinggreen into red)( LED changinggreen into red)( LED changinggreen into red)( LED changinggreen into red)
CHECK: removeSTBandoperatemonitor individually.CHECK: removeSTBandoperatemonitor individually.CHECK: removeSTBandoperatemonitor individually.CHECK: removeSTBandoperatemonitor individually.(checkSTBdefector Monitor defect)(checkSTBdefector Monitor defect)(checkSTBdefector Monitor defect)(checkSTBdefector Monitor defect)
Whenusing ANALOG STB, checkSTBonlyWhenusing ANALOG STB, checkSTBonlyWhenusing ANALOG STB, checkSTBonlyWhenusing ANALOG STB, checkSTBonlyMNMNMNMN----42PZ10onlySTB:RN42PZ10onlySTB:RN42PZ10onlySTB:RN42PZ10onlySTB:RN----BA11BA11BA11BA11
RemoveeachBoardRemoveeachBoardRemoveeachBoardRemoveeachBoardspower supply connector and checkthepower isoff.spower supply connector and checkthepower isoff.spower supply connector and checkthepower isoff.spower supply connector and checkthepower isoff.
Whenthepower isnotoff,replacethe relatedboard.Whenthepower isnotoff,replacethe relatedboard.Whenthepower isnotoff,replacethe relatedboard.Whenthepower isnotoff,replacethe relatedboard.
No RasterNo RasterNo RasterNo Raster
N PiN PiN PiN Pi
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X CANVAS
normalnormalnormalnormal
CANVASX
nopicture(LEDnopicture(LEDnopicture(LEDnopicture(LEDsgreen)sgreen)sgreen)sgreen)
Core checkpoint: removeSTBandoperatemonitor individually.Core checkpoint: removeSTBandoperatemonitor individually.Core checkpoint: removeSTBandoperatemonitor individually.Core checkpoint: removeSTBandoperatemonitor individually.(checkwhether(checkwhether(checkwhether(checkwhether STBSTBSTBSTBssssadefector monitoradefector monitoradefector monitoradefector monitorsone)sone)sone)sone)
No PictureNo PictureNo PictureNo Picture
Withmonitor defect, check VSCandthenWithmonitor defect, check VSCandthenWithmonitor defect, check VSCandthenWithmonitor defect, check VSCandthen Controller Board.Controller Board.Controller Board.Controller Board.
Troubleshooting: replaceVSCBoardTroubleshooting: replaceVSCBoardTroubleshooting: replaceVSCBoardTroubleshooting: replaceVSCBoard
Address Bar ( Hori ontal Bar )Add B ( H i t l B )Add B ( H i t l B )Address Bar ( Hori ontal Bar )
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X CANVAS
normalnormalnormalnormal
CANVASX
no image(LEDno image(LEDno image(LEDno image(LEDsgreen)sgreen)sgreen)sgreen)
Cause:YCause:YCause:YCause:Y----Drive(Bottom)defectDrive(Bottom)defectDrive(Bottom)defectDrive(Bottom)defect
Troubleshooting:YTroubleshooting:YTroubleshooting:YTroubleshooting:Y----Drive(lower part) replacementDrive(lower part) replacementDrive(lower part) replacementDrive(lower part) replacement
Address Bar ( Horizontal Bar )Address Bar ( Horizontal Bar )Address Bar ( Horizontal Bar )Address Bar ( Horizontal Bar )
YYYY----DriveBoard(Bottom)DriveBoard(Bottom)DriveBoard(Bottom)DriveBoard(Bottom)
Thisproblem isshown inthebottomofscreen,Thisproblem isshown inthebottomofscreen,Thisproblem isshown inthebottomofscreen,Thisproblem isshown inthebottomofscreen,So it is causedbyYSo it is causedbyYSo it is causedbyYSo it is causedbyY----DriveDriveDriveDrive
Address Bar ( Horizontal Bar )Address Bar ( Horizontal Bar )Address Bar ( Horizontal Bar )Address Bar ( Horizontal Bar )
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LG Electronics/DND QALG Electronics/DND QALG Electronics/DND QALG Electronics/DND QA GrGrGrGr
X CANVAS
normalnormalnormalnormal
CANVASX
no image(LEDno image(LEDno image(LEDno image(LEDsgreen)sgreen)sgreen)sgreen)
Address Bar ( Horizontal Bar )Address Bar ( Horizontal Bar )Address Bar ( Horizontal Bar )Address Bar ( Horizontal Bar )
YYYY----DriveBoard(Top)DriveBoard(Top)DriveBoard(Top)DriveBoard(Top)
Cause:YCause:YCause:YCause:Y----DriveBoard(upper part) defectDriveBoard(upper part) defectDriveBoard(upper part) defectDriveBoard(upper part) defect
Troubleshooting:YTroubleshooting:YTroubleshooting:YTroubleshooting:Y----DriveBoard replacementDriveBoard replacementDriveBoard replacementDriveBoard replacement
No PictureNo PictureNo PictureNo Picture
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LG Electronics/DND QALG Electronics/DND QALG Electronics/DND QALG Electronics/DND QA GrGrGrGr
X CANVAS
normalnormalnormalnormal
CANVASX
no image(LEDno image(LEDno image(LEDno image(LEDsgreen)sgreen)sgreen)sgreen)
PD501 ConnectorPD501 ConnectorPD501 ConnectorPD501 Connector
No PictureNo PictureNo PictureNo Picture
cause:PDcause:PDcause:PDcause:PD----501Connector contactpointdefect501Connector contactpointdefect501Connector contactpointdefect501Connector contactpointdefect
troubleshooting:PDtroubleshooting:PDtroubleshooting:PDtroubleshooting:PD----501Connector replacement501Connector replacement501Connector replacement501Connector replacement
(withPD(withPD(withPD(withPD----501Connector contactpointdefect,501Connector contactpointdefect,501Connector contactpointdefect,501Connector contactpointdefect,Variousdefectsymptoms canbeseen)Variousdefectsymptoms canbeseen)Variousdefectsymptoms canbeseen)Variousdefectsymptoms canbeseen)
High frequency noise (High frequency noise (High frequency noise (High frequency noise (BeeBeeBeeBee sound)sound)sound)sound)
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X CANVAS
normalnormalnormalnormal
CANVASX
normal picturewithhighfrequencynoise(normal picturewithhighfrequencynoise(normal picturewithhighfrequencynoise(normal picturewithhighfrequencynoise(beebeebeebee))))
High frequency noise (High frequency noise (High frequency noise (High frequency noise (BeeBeeBeeBee sound)sound)sound)sound)
C81780.22uF
electrolyticcapacitor insertion
OpenC8139 rightleadandthen
wireR8164 rightlead
Power (SMPS)BoardPower (SMPS)BoardPower (SMPS)BoardPower (SMPS)Board
1.C81780.221.C81780.221.C81780.221.C81780.22/50Vadd/50Vadd/50Vadd/50Vadd2.OpenC8139 right lead,2.OpenC8139 right lead,2.OpenC8139 right lead,2.OpenC8139 right lead,
andthen connect ittoandthen connect ittoandthen connect ittoandthen connect ittoR8164 right lead.R8164 right lead.R8164 right lead.R8164 right lead.
Improvedsince Nov,2001Improvedsince Nov,2001Improvedsince Nov,2001Improvedsince Nov,2001
SMPS issupposedtooperateSMPS issupposedtooperateSMPS issupposedtooperateSMPS issupposedtooperatewithhighfrequencysowithhighfrequencysowithhighfrequencysowithhighfrequencysosmall noise isnot consideredsmall noise isnot consideredsmall noise isnot consideredsmall noise isnot consideredasadefect.asadefect.asadefect.asadefect.
#.#.#.#.Slightnoise isnotadefectandwritedownexplanationSlightnoise isnotadefectandwritedownexplanationSlightnoise isnotadefectandwritedownexplanationSlightnoise isnotadefectandwritedownexplanation
No picture in rightNo picture in rightNo picture in rightNo picture in right 2/5 area2/5 area2/5 area2/5 area
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X CANVAS
normalnormalnormalnormal
CANVASX
No picture in rightNo picture in rightNo picture in rightNo picture in right---- 2/5 area2/5 area2/5 area2/5 area
Nopicture inthe rightNopicture inthe rightNopicture inthe rightNopicture inthe right---- 2/5 area2/5 area2/5 area2/5 area
XXXX----Board( Left)power supply checkBoard( Left)power supply checkBoard( Left)power supply checkBoard( Left)power supply check
XXXX----Board( Left)Connector checkBoard( Left)Connector checkBoard( Left)Connector checkBoard( Left)Connector check
XXXX----Board( Left) replacementBoard( Left) replacementBoard( Left) replacementBoard( Left) replacement
Address Bar (Vertical )Address Bar (Vertical )Address Bar (Vertical )Address Bar (Vertical )
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X CANVAS
normalnormalnormalnormal
CANVASX
Address Bar (Vertical )Address Bar (Vertical )Address Bar (Vertical )Address Bar (Vertical )
stripe in rightstripe in rightstripe in rightstripe in right----2/5area2/5area2/5area2/5area
XXXX----Board( Left)power supply checkBoard( Left)power supply checkBoard( Left)power supply checkBoard( Left)power supply check
XXXX----Board( Left)Connector checkBoard( Left)Connector checkBoard( Left)Connector checkBoard( Left)Connector check
XXXX----Board( Left) replacementBoard( Left) replacementBoard( Left) replacementBoard( Left) replacement
No picture in left 3/5 of the screenNo picture in left 3/5 of the screenNo picture in left 3/5 of the screenNo picture in left 3/5 of the screen
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X CANVAS
normalnormalnormalnormal
CANVASX
XXXX----Board(Right)power supply checkBoard(Right)power supply checkBoard(Right)power supply checkBoard(Right)power supply check
XXXX----Board(Right)Connector checkBoard(Right)Connector checkBoard(Right)Connector checkBoard(Right)Connector check
XXXX----Board(Right) replacementBoard(Right) replacementBoard(Right) replacementBoard(Right) replacement
left3/5ofscreenwithvertical stripesleft3/5ofscreenwithvertical stripesleft3/5ofscreenwithvertical stripesleft3/5ofscreenwithvertical stripes
No picture in left 3/5 of the screenNo picture in left 3/5 of the screenNo picture in left 3/5 of the screenNo picture in left 3/5 of the screen
Address Bar (Vertical )Address Bar (Vertical )Address Bar (Vertical )Address Bar (Vertical )
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X CANVAS
normalnormalnormalnormal
CANVASX
XXXX----Board(Right)power supply checkBoard(Right)power supply checkBoard(Right)power supply checkBoard(Right)power supply check
XXXX----Board(Right)Connector checkBoard(Right)Connector checkBoard(Right)Connector checkBoard(Right)Connector check
XXXX----Board(Right) replacementBoard(Right) replacementBoard(Right) replacementBoard(Right) replacement
Address Bar (Vertical )Address Bar (Vertical )Address Bar (Vertical )Address Bar (Vertical )
left3/5ofscreenwithvertical stripes.left3/5ofscreenwithvertical stripes.left3/5ofscreenwithvertical stripes.left3/5ofscreenwithvertical stripes.
No RedNo RedNo RedNo Red
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X CANVAS
normalnormalnormalnormal
CANVASX
no Red(Bor G )no Red(Bor G )no Red(Bor G )no Red(Bor G )
Besurenottobend itbyforceor internalBesurenottobend itbyforceor internalBesurenottobend itbyforceor internalBesurenottobend itbyforceor internalInsulated conductor canbedown.Insulated conductor canbedown.Insulated conductor canbedown.Insulated conductor canbedown.
TestMonitor individually.TestMonitor individually.TestMonitor individually.TestMonitor individually.
Ifdetectaproblemwithmonitor, checkVSCBoard.Ifdetectaproblemwithmonitor, checkVSCBoard.Ifdetectaproblemwithmonitor, checkVSCBoard.Ifdetectaproblemwithmonitor, checkVSCBoard.
If ithasaproblemwithSTB connecting,focuson 25Pin.If ithasaproblemwithSTB connecting,focuson 25Pin.If ithasaproblemwithSTB connecting,focuson 25Pin.If ithasaproblemwithSTB connecting,focuson 25Pin.
Besurenotto connect5Pin(APBesurenotto connect5Pin(APBesurenotto connect5Pin(APBesurenotto connect5Pin(AP----EA10)byforceEA10)byforceEA10)byforceEA10)byforce
25252525PinCableP/No: GVZ APPinCableP/No: GVZ APPinCableP/No: GVZ APPinCableP/No: GVZ AP----EA10EA10EA10EA10
No RedNo RedNo RedNo Red
1) X - Board COF Connector separation
42424242 InchInchInchInch
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Lift up the right and left of X-BOARD CONNECTOR. Lift up X-BOARD CONNECTOR and separateCOP CONNECTOR by pulling up.
When you handle COF CONNECTOR, dont pressure. First release LOCK and separate.
If COF CONNECTOR is damaged, you should replace MODULE ASSY. So, be aware of this!!
1) X Board COF Connector separation
When you exchange X-Board, first you should separate COFConnector. Be careful to handle it.COF Connector is attached to Module. When COF Connector isbroken, Module ASSY must be replaced a new one.
When you exchange X-Board, first you should separate COFConnector. Be careful to handle it.COF Connector is attached to Module. When COF Connector isbroken, Module ASSY must be replaced a new one.
WarningWarning
COF Connector
42424242 InchInchInchInch
2) X - Board Connector separation
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Lift up each edge of left/right. Lifted condition
2) X Board Connector separation
Its 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
WarningWarning
Be careful to handle LOCK or it can be broken.When LOCK is broken, replace a new X-BOARD.
3) Y - Board COF Connector separation
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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
WarningWarning
Be careful to handle LOCK and COF Connector. When LOCK part is damaged, you should replacea new Y-Board. In case of COF Connector, Module Assembly.
4) Z - Board COF Connector separation
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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.
Its easy to separate COF on conditionthat Z-Board Screw is separated.In case Z-Board is assembled, its reallyhard to separate.
Be careful not to tear COF Connector.
If COF Connector is torn, replace a new Module Assembly
WarningWarningCOF Connector
5) Connector separation Guide
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LG Electronics/DND QALG Electronics/DND QALG Electronics/DND QALG Electronics/DND QA GrGrGrGr
Push LOCK and pull out
PUSH PUSH PUSH
5) Connector separation Guide
PUSH PUSH PULL
6) Control Board & VSC Board Connector
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)
7) Gas injection (Sealing up) condition
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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.
) j ( g p)
WarningWarning
Be sealed up after gas injection
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9) Power off in 2 ~ 3 minutes(Protection)
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L813 Cold Solder
CheckCheck
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,its off in 2 - 3minutes.(PROTECT operation)
Cause : No VS voltageL813 Coil cold soldering.
10) ADD BAR inspection and repair
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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 CONNECTORbetween 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 andCONTROL BOARD. And if you cant find defect, check CONTROL.
HEATRUN : WHITE
Press the ADJ KEY and check the position of add bar by changing WHITE orRED or BLUE or GREEN
Top Right Top Left
Bottom Right Bottom Left
11) One Point Service Guide
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Symptom : B color 1 Address line Open
Cause : Dented COF
COF is dented
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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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CheckCheck
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 reducesbelow 14V,Mis-discharge occurs andpower off because ofprotection 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 disconnectingall X & Y boards.
Defective X-Board
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Check
Check
The top left part of screen is broken(Top Right X-BOARD)
Symptom Cause Countermeasure
No 5V supply to Top rightX-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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CheckCheck
Pinkish screen in the top left.(Top right X-BOARD)
Symptom Cause Countermeasure
No Va(70V) supply to Topright 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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CheckCheck
The 3/5 top left in the screen is blank(Top Right X-BOARD)
Symptom Cause Countermeasure
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 rightX-Board.
No Va(70V) supply to Top
right X-Board.
Connect 12V line
Connect 70V line
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CheckCheck
The 3/5 top right of the screen is blank.(Top left X-BOARD)
Symptom Cause Countermeasure
No 12V supply to Top leftX-Board.
No Va(70V) supply to Top
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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CheckCheck
Pinkish screen in the 1/5 top right(Top left X-BOARD)
P1 COF connector on Top leftX-Board is open.
Reassemble it
Check the contact point and Locking of P1 on Top left X-BOARD.
Symptom Cause Countermeasure
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CheckCheck
The 3/5 bottom left of screen is broken.(BOTTOM RIGHT X-BOARD)
Symptom Cause Countermeasure
No 5V supply to bottom rightX-Board.
Connect 5V line
Check Bottom right X-BOARD 5V.( If 0V, it happens )
Check 5V line from SMPS to X-BOARD.
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CheckCheck
The 3/5 bottom left of the screen is Blank.(Bottom Right X-BOARD)
Symptom Cause Countermeasure
Check Bottom right X-BOARD 12V.( If 0V, it happens )
Check 12V line from SMPS to X-BOARD.
No 12V supply to bottom rightX-Board.
No Va(70V) supply to bottom
right X-Board.
Connect 12V line
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CheckCheck
The 2/5 right of the screen is broken.(Bottom left X-BOARD)
Symptom Cause Countermeasure
Check Bottom left X-BOARD 5V.( If 0V, it happens )
Check 5V line from SMPS to X-BOARD.
No 5V supply to bottom leftX-Board.
Connect 5V line
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CheckCheck
The 2/5 right part of the screen is blank.(Bottom left X-BOARD )
No 12V supply to bottom leftX-Board.
Connect 12V line
Check Bottom left X-BOARD 12V.( If 0V, it happens )
Check 12V line from SMPS to X-BOARD.
Symptom Cause Countermeasure
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CheckCheck
ADDRESS bar appears in the right bottom of the screen.(X-BOARD BOTTOM LEFT)
The connecting of X-Board bottomleft connector is bad.
Reassemble it.
Check connecting of the connector of bottom left X-BOARD.
Reassemble it.
X-BOARD BOTTOM LEFT CONNECTOR
OPEN.
Symptom Cause Countermeasure
ExamplesExamplesExamplesExamples
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CheckCheck
Screen is divided in top and bottom, and vertical barappears.
Connector(P13) is OPEN orConnecting condition is bad
Reassemble P13.
P13 CONNECTOR contact point inferior CHECK.
P13 CONNECTOR SIGNAL CHEK.
P13 CONNECTOR
Symptom Cause Countermeasure
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LG Electronics/DND QALG Electronics/DND QALG Electronics/DND QALG Electronics/DND QA GrGrGrGr
CheckCheck
Screen is broken and has the vertical/horizontal bar.
VSC Board Connector is Open. Reassemble VSC BoardConnector
Check the connector connecting
Reassemble the Connector
Symptom Cause Countermeasure
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LG Electronics/DND QALG Electronics/DND QALG Electronics/DND QALG Electronics/DND QA GrGrGrGr
CheckCheck
The screen is bluish(Mosaic screen)
Loose VSC Board Connector Reassemble VSC BOARDConnector
Check the connection condition of the Connector.
Reassemble the Connector.
Symptom Cause Countermeasure
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LG Electronics/DND QALG Electronics/DND QALG Electronics/DND QALG Electronics/DND QA GrGrGrGr
CheckCheck
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
Symptom Cause Countermeasure
ExamplesExamplesExamplesExamples
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LG Electronics/DND QALG Electronics/DND QALG Electronics/DND QALG Electronics/DND QA GrGrGrGr
IC201(VPC3230D) Decoder is inferior
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LG Electronics/DND QALG Electronics/DND QALG Electronics/DND QALG Electronics/DND QA GrGrGrGr
CheckCheck
Noise with division of colors
Bad Connector connectingControl Board and VSC B/D.
Contact point and signal condition of Connector Control Board and VSC Board.
Abnormal Normal
Bad Connector
SymptomCause
Countermeasure
Change the Connector
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LG Electronics/DND QALG Electronics/DND QALG Electronics/DND QALG Electronics/DND QA GrGrGrGr
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 getshigh temperature, you can observe it(In normal temperature its O.K. )
IC2 DA1(Data Arrange) No.162 Pin output is changing
depending on the temperature. abnormal X-Bd 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) onX B/D to read data.
2. Countermeasure : Replace IC2
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LG Electronics/DND QALG Electronics/DND QALG Electronics/DND QALG Electronics/DND QA GrGrGrGr
Name Add Open (Green 1 Line)
Symptom Cause and Countermeasure
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 LineAdd. COF Drive IC inferior
COF inspection
: 24V Open check (normal 50V)
Add. COF Drive IC
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Name Vertical bar when Power off/on(Mis-discharge)
Symptom Cause and Countermeasure
Realization
1.PDP Power on Mode external input(regardless of wire/wireless signal but its easy to reenact in wireless
signal)2. Remove Power Cord (Powers off)3.after about 20minutes, insert Power cord
(automatically the Powers 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