42 inch pdp training manual

8/11/2019 42 INCH PDP Training Manual

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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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LG El e c tron ics /DND QALG El e c tron ics /DND QALG El e c tron ics /DND QALG El e c tron ics /DND QA GrGrGrGr

!!! ! .... 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 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 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 & ventilation

Color 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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6/79LG El e c tron ics /DND QALG El e c tron ics /DND QALG El e c tron ics /DND QALG El e c tron ics /DND QA GrGrGrGr

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 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)X2Display 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 connector Power Source : 110 -240V , 50/60 HzPower Consumption: 300 watts( with Max. Audio : 320W)

MN-42PZ10(42W PDP MNT)Market : Korea / N _ Ame ric a / S_Ame ric aMarket : Korea / N _ Ame ric a / S_Ame ric aMarket : Korea / N _ Ame ric a / S_Ame ric aMarket : Korea / N _ Ame ric a / S_Ame ric a

(200 # . Ju ly ~)(200 # . Ju ly ~)(200 # . Ju ly ~)(200 # . Ju ly ~)

Spec of ModelsSpec of ModelsSpec of ModelsSpec of Models

RNRNRNRN----B A## (3 System Multi STB)BA## (3 System Multi STB)BA## (3 System Multi STB)BA## (3 System Multi STB)430(W)X78(H)X280mm( D)

((((Examp le of D esk Top Type)Examp le of D esk Top Type)Examp le of D esk Top Type)Examp le of D esk Top Type)


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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

Y D R V U p p e r

B / D A S S Y

Y D R V L o w e r

B

/ D A S S Y

P1

P2

### # .... Module diagram & specModule diagram & specModule diagram & specModule diagram & spec

P' RT ) O. p*+du,- . am/ 0- a. da*d1 6871QTH003B PWB(PCB) ' SSY ZC) T TOP B23 ' SSY2 6871QZH002B PWB(PCB) ' SSY ZSUS B23 ' SSY 3 6871QTH004B PWB(PCB) ' SSY ZC) T BOTTOM B23 ' SSY 4 6871Q4H012' PWB(PCB) ' SSY X 45 FT BOTTOM B23 ' SSY5 6871QRH010' PWB(PCB) ' SSY X RI6HT BOTTOM B23 ' SSY6 6871Q3P016B PWB(PCB) ' SSY Y3RV Upp/* B23 ' SSY 7 6871Q3P017B PWB(PCB) ' SSY Y3RV 4+w/* B23 ' SSY 8 6871QYH015' PWB(PCB) ' SSY YSUS B23 ' SSY

YDRV B/D ASSY

ZCNT TOP B/D ASSY

ZCNT BOTTOM B/D ASSY

5 XT5 R) '4 C' B45 CO))5 CTIO)5 XT5 R) '4 C' B45 CO))5 CTIO)5 XT5 R) '4 C' B45 CO))5 CTIO)5 XT5 R) '4 C' B45 CO))5 CTIO),+../,-+* 0 upp 7y 08 g. a7

P1~P2[ X B23 ] 5V, 1 5V, V'P3[ Y SUS B23 ] VSC, VS5TUPP2[ Y SUS B23 ] 5V, 1 5V, VS

P1[ Z SUS B23 ] 5V, 1 5V, VSP300[ CTR4 B23 ] 5VP100 [ CTR4 B23 ] VI35 O SI 6)'4



YYYY---- Boa rdBoa rdBoa rdBoa rd

Cont ro lle rCont ro lle rCont ro lle rCont ro lle rBoa rdBoa rdBoa rdBoa rd

ZZZZ---- Boa rdBoa rdBoa rdBoa rd

CN#CN#CN#CN#

CN2CN2CN2CN2

Lo c a l keyLo c a l keyLo c a l keyLo c a l key

EMI Fil te rEMI Fil te rEMI Fil te rEMI Fil te r

VSCVSCVSCVSCBoa rdBoa rdBoa rdBoa rd

POW ERPOW ERPOW ERPOW ERBoa rdBoa rdBoa rdBoa rd

X X X X Boa rd ( R )Boa rd ( R )Boa rd ( R )Boa rd ( R )X X X X Boa rd ( L )Boa rd ( L )Boa rd ( L )Boa rd ( L )

Y Y Y Y ----

D r i v e

D r i v e

D r i v e

D r i v e

Y Y Y Y ---- D r i v e

D r i v e

D r i v e

D r i v e

Ma in Powe rMa in Powe rMa in Powe rMa in Powe r



STBSTBSTBSTBSTBSTBSTBSTB

PCPCPCPCPCPCPCPC

VideoVideoVideoVideoVideoVideoVideoVideo

DVDDVDDVDDVDDVDDVDDVDDVD

LA7222LA7222LA7222LA7222LA7222LA7222LA7222LA7222

VPC3230VPC3230VPC3230VPC3230VPC3230VPC3230VPC3230VPC3230 S DA94 # 0SDA94 # 0SDA94 # 0SDA94 # 0SDA94 # 0SDA94 # 0SDA94 # 0SDA94 # 0 CXA2#0#CXA2#0#CXA2#0#CXA2#0#CXA2#0#CXA2#0#CXA2#0#CXA2#0# THS8083THS8083THS8083THS8083THS8083THS8083THS8083THS8083

CXA2022SCXA2022SCXA2022SCXA2022SCXA2022SCXA2022SCXA2022SCXA2022SMX88L284MX88L284MX88L284MX88L284MX88L284MX88L284MX88L284MX88L284 Buffe rBuffe rBuffe rBuffe r

HC54 #HC54 #HC54 #HC54 #

Buffe rBuffe rBuffe rBuffe r

HC54 #HC54 #HC54 #HC54 #

LA4282LA4282LA4282LA4282LA4282LA4282LA4282LA4282

MICOMMICOMMICOMMICOM

CXP7500 # 0CXP7500 # 0CXP7500 # 0CXP7500 # 0

HC74HC74HC74HC74HC74HC74HC74HC74

P D

P M P

D U

L E

P D

P M P

D U

L E

P D

P M P

D U

L E

P D

P M P

D U

L E

2222MMMM----S DRAMSDRAMSDRAMSDRAM2222MMMM----S DRAMSDRAMSDRAMSDRAM

Monitor Block diagramMonitor Block diagramMonitor Block diagramMonitor Block diagram



MICOM

EEPROMX2416P

VIDEOSWITCH

(M52758FP)

AUDIO

L

R AUDIO 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

H

V

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

41P8

4

H/V/FIELD/LLC1

MN-42PZ" 0 VSC(JAG200 & FLI2200) Block Diagram



TUNER.1

9:;?>?

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

PC L / R

Y,Pb,Pr (DTV)

Y,Pb,Pr(DTV)

RGB(PC)

CVBSRGB

M52758FPRGB/YUV

S/W

DCF

RE

WE

RN-BA11(Tuner Receiver) Block - DiagramRN-BA11(Tuner Receiver) Block - Diagram Ro

Lo

Y/C9:;



Conne c ting 25 P in c ab leConne c ting 25 P in c ab leConne c ting 25 P in c ab leConne c ting 25 P in c ab le(when c onne c ting 25 P in c ab le,(when c onne c ting 25 P in c ab le,(when c onne c ting 25 P in c ab le,(when c onne c ting 25 P in c ab le,Conne c t exte rna l equ ipment to STB)Conne c t exte rna l equ ipment to STB)Conne c t exte rna l equ ipment to STB)Conne c t exte rna l equ ipment to STB)

Product back & monitor in/output sectionProduct back & monitor in/output sectionProduct back & monitor in/output sectionProduct back & monitor in/output section



Powe r Boa rdPowe r Boa rdPowe r Boa rdPowe r Boa rdYYYY---- Drive (TOP)Drive (TOP)Drive (TOP)Drive (TOP)

YYYY----Boa rdBoa rdBoa rdBoa rdVSC Boa rdVSC Boa rdVSC Boa rdVSC Boa rd

YYYY---- Drive (Bottom)Drive (Bottom)Drive (Bottom)Drive (Bottom)

ZZZZ----Boa rdBoa rdBoa rdBoa rd

Cont ro lle r Boa rdCont ro lle r Boa rdCont ro lle r Boa rdCont ro lle r Boa rd

EMI Fil te rEMI Fil te rEMI Fil te rEMI Fil te r

Connection diagram (back coverConnection diagram (back coverConnection diagram (back coverConnection diagram (back cover s open)s open)s open)s open)



BACK COVERBACK COVERBACK COVERBACK COVER

POW ER BOARDPOW ER BOARDPOW ER BOARDPOW ER BOARDVSC BOARDVSC BOARDVSC BOARDVSC BOARD EMI Fil te rEMI Fil te rEMI Fil te rEMI Fil te r

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 )



PANELPANELPANELPANEL

YYYY----BO ARDBOARDBOARDBOARD

ZZZZ----BO ARDBOARDBOARDBOARD

CO NTROLCO NTROLCO NTROLCO NTROLBOARDBOARDBOARDBOARD

XXXX----BO ARDBOARDBOARDBOARD

XXXX----BO ARDBOARDBOARDBOARD

YYYY---- Drive BOARDDrive BOARDDrive BOARDDrive BOARD

YYYY---- Drive BOARDDrive BOARDDrive BOARDDrive BOARD

Exploded view (Module)Exploded view (Module)Exploded view (Module)Exploded view (Module)



VSC Boa rd( Front)VSC Boa rd( Front)VSC Boa rd( Front)VSC Boa rd( Front) EMI Fil te rEMI Fil te rEMI Fil te rEMI Fil te r

Powe r Boa rdPowe r Boa rdPowe r Boa rdPowe r Boa rd ZZZZ---- Boa rdBoa rdBoa rdBoa rdYYYY----Boa rdBoa rdBoa rdBoa rd Cont ro l Boa rd(Ba c k)Cont ro l Boa rd(Ba c k)Cont ro l Boa rd(Ba c k)Cont ro l Boa rd(Ba c k)YYYY---- Drive Boa rd (Top)Drive Boa rd (Top)Drive Boa rd (Top)Drive Boa rd (Top)

YYYY---- 3*8 v/ B+a*d3*8 v/ B+a*d3*8 v/ B+a*d3*8 v/ B+a*d

Ma in Powe rMa in Powe rMa in Powe rMa in Powe rSw itc hSw itc hSw itc hSw itc h

Parts (back covers open)Parts (back covers open)Parts (back covers open)Parts (back covers open)


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XXXX----Boa rd ( Right) Boa rd ( Right) Boa rd ( Right) Boa rd ( Right) XXXX----Boa rd ( Left )Boa rd ( Left )Boa rd ( Left )Boa rd ( Left )

Cont ro l Boa rdCont ro l Boa rdCont ro l Boa rdCont ro l Boa rd ZZZZ----Boa rdBoa rdBoa rdBoa rdYYYY----Boa rdBoa rdBoa rdBoa rdYYYY---- Drive Boa rdDrive Boa rdDrive Boa rdDrive Boa rd

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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Power well power Board-Korean market Murata Power 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 partDisplaying 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 displayingok

Non-image

Set pattern( GND ) to ANODE,Pattern (resistance joint part ) to CATHOD,

Test diode forward and backward.Measure @ resistance value.(10 A )

GNDresistance

""" " 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 displayed1) 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

BBB


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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 copy1) 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

setdown230 s

25 s

230VVsetup

175VVs

Y output voltage wave

175VVs

15 s

20 s

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


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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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P6

P4

Rework should be done

Y-Driver Board

Y-Board

4242424242424242 PDP Flicker andPDP Flicker andPDP Flicker andPDP Flicker andPDP Flicker andPDP Flicker andPDP Flicker andPDP Flicker and No Raster TroubleshootingNo Raster TroubleshootingNo Raster TroubleshootingNo Raster TroubleshootingNo Raster TroubleshootingNo Raster TroubleshootingNo Raster TroubleshootingNo Raster Troubleshooting GuideGuideGuideGuideGuideGuideGuideGuide

cause : bad connection between Y-Board

# 1, 2 drive board Connector pin

&&&& .... One Point Service GuideOne Point Service GuideOne Point Service GuideOne Point Service Guide 42424242 InchInchInchInch


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amplified amplified

C : outside LegD : inside Leg

P 6, P 4 both are the first pin, whenwiring, it should be done as pictureshown.

(bend the wire to Y-Driver B/D notto Y-B/D . If not there can be noise)

Dont be confused with Pin number

Improved since Dec,2001.

P 4 C

D

D

C

C

DC

D

CD

DC

P 6


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D

CD

DC

C

D

C

Be su re not to m is c onne c t the line.Be su re not to m is c onne c t the line.Be su re not to m is c onne c t the line.Be su re not to m is c onne c t the line.See the p ic tu re p re ci se ly and then c onne c t jump wire at the exa cSee the p ic tu re p re ci se ly and then c onne c t jump wire at the exa cSee the p ic tu re p re ci se ly and then c onne c t jump wire at the exa cSee the p ic tu re p re ci se ly and then c onne c t jump wire at the exa c t po intt po intt po intt po int


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X C ANVAS X C AVBAS

Intermittent noIntermittent noIntermittent noIntermittent no- ---image/image error while watchingimage/image error while watchingimage/image error while watchingimage/image error while watching

The s cr een is inte rm ittent ly d isappea red . LED i s g reenThe s cr een is inte rm ittent ly d isappea red . LED i s g reenThe s cr een is inte rm ittent ly d isappea red . LED i s g reenThe s cr een is inte rm ittent ly d isappea red . LED i s g reen s cr een is d isto rted s cr een is d isto rted s cr een is d isto rted s cr een is d isto rted we ide rlywe ide rlywe ide rlywe ide rly (happened 2 a day)(happened 2 a day)(happened 2 a day)(happened 2 a day)

no rma lno rma lno rma lno rma l

c ause : bad c onne c tion between Yc ause : bad c onne c tion between Yc ause : bad c onne c tion between Yc ause : bad c onne c tion between Y----Boa rd and # # , 2 p in ofBoa rd and # # , 2 p in ofBoa rd and # # , 2 p in ofBoa rd and # # , 2 p in ofYYYY---- Drive Boa rd Conne c to rDrive Boa rd Conne c to rDrive Boa rd Conne c to rDrive Boa rd Conne c to r

troub leshoot ing : c onne c t bad link ing between Ytroub leshoot ing : c onne c t bad link ing between Ytroub leshoot ing : c onne c t bad link ing between Ytroub leshoot ing : c onne c t bad link ing between Y----Boa rd & Boa rd & Boa rd & Boa rd & YYYY---- Drive with jump wire (a ll 4 pa rts)Drive with jump wire (a ll 4 pa rts)Drive with jump wire (a ll 4 pa rts)Drive with jump wire (a ll 4 pa rts)

see wo rking inst ruc tion( rev ised s inc e D e c ,200 # . # )see wo rking inst ruc tion( rev ised s inc e D e c ,200 # . # )see wo rking inst ruc tion( rev ised s inc e D e c ,200 # . # )see wo rking inst ruc tion( rev ised s inc e D e c ,200 # . # )

CANVASX


35/79


X C ANVAS


CANVASX

No Powe rNo Powe rNo Powe rNo Powe r

( in ST( in ST( in ST( in ST----BY mode, but no LED )BY mode, but no LED )BY mode, but no LED )BY mode, but no LED )

Che c k the powe r supp ly & ma in powe r S / W onChe c k the powe r supp ly & ma in powe r S / W onChe c k the powe r supp ly & ma in powe r S / W onChe c k the powe r supp ly & ma in powe r S / W on

Che c k E MI boa rd fuse (c he c k the rated c apa ci ty )Che c k E MI boa rd fuse (c he c k the rated c apa ci ty )Che c k E MI boa rd fuse (c he c k the rated c apa ci ty )Che c k E MI boa rd fuse (c he c k the rated c apa ci ty )

No PowerNo PowerNo PowerNo Power

Fuse #5 AFuse #5 AFuse #5 AFuse #5 A

Be su re to use rated fuse.Be su re to use rated fuse.Be su re to use rated fuse.Be su re to use rated fuse.


36/79


X C AVBAS


CANVASX

when Powe rwhen Powe rwhen Powe rwhen Powe rs on, afte r 2 ~ 3 se c , its on, afte r 2 ~ 3 se c , its on, afte r 2 ~ 3 se c , its on, afte r 2 ~ 3 se c , its offs offs offs off

( LED c hang ing g reen into red )( LED c hang ing g reen into red )( LED c hang ing g reen into red )( LED c hang ing g reen into red )

CHECK : remove STB and ope rate mon ito r ind ividua lly.CHECK : remove STB and ope rate mon ito r ind ividua lly.CHECK : remove STB and ope rate mon ito r ind ividua lly.CHECK : remove STB and ope rate mon ito r ind ividua lly.(c he c k STB defe c t o r Mon ito r defe c t )(c he c k STB defe c t o r Mon ito r defe c t )(c he c k STB defe c t o r Mon ito r defe c t )(c he c k STB defe c t o r Mon ito r defe c t )

When us ing ANALOG STB, c he c k STB on lyWhen us ing ANALOG STB, c he c k STB on lyWhen us ing ANALOG STB, c he c k STB on lyWhen us ing ANALOG STB, c he c k STB on lyMNMNMNMN----42PZ #0 on ly STB : RN42PZ #0 on ly STB : RN42PZ #0 on ly STB : RN42PZ #0 on ly STB : RN----B A##BA##BA##BA##

Remove ea c h Boa rdRemove ea c h Boa rdRemove ea c h Boa rdRemove ea c h Boa rd s powe r supp ly c onne c to r and c he c k the powe r is off.s powe r supp ly c onne c to r and c he c k the powe r is off.s powe r supp ly c onne c to r and c he c k the powe r is off.s powe r supp ly c onne c to r and c he c k the powe r is off.When the powe r is not off, rep la c e the re lated boa rd.When the powe r is not off, rep la c e the re lated boa rd.When the powe r is not off, rep la c e the re lated boa rd.When the powe r is not off, rep la c e the re lated boa rd.

No RasterNo RasterNo RasterNo Raster


37/79


X C ANVAS


CANVASX

no p ic tu re (LEDno p ic tu re (LEDno p ic tu re (LEDno p ic tu re (LEDs g reen)s g reen)s g reen)s g reen)

Co re c he c kpo int : remove STB and ope rate mon ito r ind ividua lly.Co re c he c kpo int : remove STB and ope rate mon ito r ind ividua lly.Co re c he c kpo int : remove STB and ope rate mon ito r ind ividua lly.Co re c he c kpo int : remove STB and ope rate mon ito r ind ividua lly.(c he c k whethe r(c he c k whethe r(c he c k whethe r(c he c k whethe r STBSTBSTBSTB s s s s a defe c t o r mon ito ra defe c t o r mon ito ra defe c t o r mon ito ra defe c t o r mon ito rs one)s one)s one)s one)

No PictureNo PictureNo PictureNo Picture

With mon ito r defe c t, c he c k VSC and thenWith mon ito r defe c t, c he c k VSC and thenWith mon ito r defe c t, c he c k VSC and thenWith mon ito r defe c t, c he c k VSC and then Cont ro lle r Boa rd.Cont ro lle r Boa rd.Cont ro lle r Boa rd.Cont ro lle r Boa rd.

Troub leshoot ing : r ep la c e VSC Boa rd Troub leshoot ing : r ep la c e VSC Boa rd Troub leshoot ing : r ep la c e VSC Boa rd Troub leshoot ing : r ep la c e VSC Boa rd

dd ( l )dd ( l )dd ( l )dd ( l )


38/79


X C ANVAS


CANVASX

no image (LEDno image (LEDno image (LEDno image (LEDs g reen)s g reen)s g reen)s g reen)

Cause : YCause : YCause : YCause : Y---- Drive ( Bottom ) defe c tDrive ( Bottom ) defe c tDrive ( Bottom ) defe c tDrive ( Bottom ) defe c t

Troub leshoot ing : YTroub leshoot ing : YTroub leshoot ing : YTroub leshoot ing : Y---- Drive (lowe r pa rt) rep la c ement Drive (lowe r pa rt) rep la c ement Drive (lowe r pa rt) rep la c ement Drive (lowe r pa rt) rep la c ement

Address Bar ( Horizontal Bar )Address Bar ( Horizontal Bar )Address Bar ( Horizontal Bar )Address Bar ( Horizontal Bar )

YYYY---- Drive Boa rd ( Bottom )Drive Boa rd ( Bottom )Drive Boa rd ( Bottom )Drive Boa rd ( Bottom )

Th is p rob lem is shown in the bottom of s cr een,Th is p rob lem is shown in the bottom of s cr een,Th is p rob lem is shown in the bottom of s cr een,Th is p rob lem is shown in the bottom of s cr een,So it is c aused by YSo it is c aused by YSo it is c aused by YSo it is c aused by Y---- Drive Drive Drive Drive

Add B ( H i l B )Add B ( H i l B )Add B ( H i l B )Add B ( H i l B )


39/79


X C ANVAS


CANVASX


Address Bar ( Horizontal Bar )Address Bar ( Horizontal Bar )Address Bar ( Horizontal Bar )Address Bar ( Horizontal Bar )

YYYY---- Drive Boa rd ( Top )Drive Boa rd ( Top )Drive Boa rd ( Top )Drive Boa rd ( Top )

Cause : YCause : YCause : YCause : Y---- Drive Boa rd (uppe r pa rt) defe c tDrive Boa rd (uppe r pa rt) defe c tDrive Boa rd (uppe r pa rt) defe c tDrive Boa rd (uppe r pa rt) defe c t

Troub leshoot ing : YTroub leshoot ing : YTroub leshoot ing : YTroub leshoot ing : Y---- Drive Boa rd rep la c ementDrive Boa rd rep la c ementDrive Boa rd rep la c ementDrive Boa rd rep la c ement

N PiN PiN PiN Pi


40/79


X C ANVAS


CANVASX


PD50 # Conne c to rPD50 # Conne c to rPD50 # Conne c to rPD50 # Conne c to r

No PictureNo PictureNo PictureNo Picture

c ause : PDc ause : PDc ause : PDc ause : PD----50 # Conne c to r c onta c t po int defe c t50 # Conne c to r c onta c t po int defe c t50 # Conne c to r c onta c t po int defe c t50 # Conne c to r c onta c t po int defe c t

troub leshoot ing : PDtroub leshoot ing : PDtroub leshoot ing : PDtroub leshoot ing : PD----50 # Conne c to r r ep la c ement50 # Conne c to r r ep la c ement50 # Conne c to r r ep la c ement50 # Conne c to r r ep la c ement

(w ith PD(w ith PD(w ith PD(w ith PD----50 # Conne c to r c onta c t po int defe c t,50 # Conne c to r c onta c t po int defe c t,50 # Conne c to r c onta c t po int defe c t,50 # Conne c to r c onta c t po int defe c t,Va rious defe c t symptoms c an be seen)Va rious defe c t symptoms c an be seen)Va rious defe c t symptoms c an be seen)Va rious defe c t symptoms c an be seen)

High frequency noise (High freq enc noise (High freq enc noise (High frequency noise ( BeeBeeBeeBee sound)so nd)so nd)sound)


41/79


X C ANVAS


CANVASX

no rma l p ic tu re with h igh frequen c y no ise (no rma l p ic tu re with h igh frequen c y no ise (no rma l p ic tu re with h igh frequen c y no ise (no rma l p ic tu re with h igh frequen c y no ise (beebeebeebee ))))

High frequency noise (High frequency noise (High frequency noise (High frequency noise ( BeeBeeBeeBee sound)sound)sound)sound)

C8 #78 0.22u F

e le c tro lyticc apa ci to r inse rtion

Open C8 #39 right lead and then

wire R8#64 right lead

Powe r (SMPS) Boa rdPowe r (SMPS) Boa rdPowe r (SMPS) Boa rdPowe r (SMPS) Boa rd

# . C8 # 78 0.22# . C8 # 78 0.22# . C8 # 78 0.22# . C8 # 78 0.22 EEEE / 50V add/ 50V add/ 50V add/ 50V add2. Open C8 # 39 right lead,2. Open C8 # 39 right lead,2. Open C8 # 39 right lead,2. Open C8 # 39 right lead,

and then c onne c t it toand then c onne c t i t toand then c onne c t it toand then c onne c t i t toR8#64 right lead.R8#64 right lead.R8#64 right lead.R8#64 right lead.

Imp roved s inc e Nov,200 #Imp roved s inc e Nov,200 #Imp roved s inc e Nov,200 #Imp roved s inc e Nov,200 #

SMPS is supposed to ope rateSMPS is supposed to ope rateSMPS is supposed to ope rateSMPS is supposed to ope ratewith h igh frequen c y sowith h igh frequen c y sowith h igh frequen c y sowith h igh frequen c y sosma ll no ise is not c ons ide red sma ll no ise is not c ons ide red sma ll no ise is not c ons ide red sma ll no ise is not c ons ide red as a defe c t.as a defe c t.as a defe c t.as a defe c t.

#. #. #. #. S light no ise is not a defe c t and write down exp lanat ionS light no ise is not a defe c t and write down exp lanat ionS light no ise is not a defe c t and write down exp lanat ionS light no ise is not a defe c t and write down exp lanat ion

N i t i ightN i t i i htN i t i i htN i t i ight 2/52/52/52/5


42/79


X C ANVAS


CANVASX

No picture in rightNo picture in rightNo picture in rightNo picture in right- --- 2/5 area2/5 area2/5 area2/5 area

No p ic tu re in the rightNo p ic tu re in the rightNo p ic tu re in the rightNo p ic tu re in the right---- 2 / 5 a rea2 / 5 a rea2 / 5 a rea2 / 5 a rea

XXXX----Boa rd ( Left ) powe r supp ly c he c kBoa rd ( Left ) powe r supp ly c he c kBoa rd ( Left ) powe r supp ly c he c kBoa rd ( Left ) powe r supp ly c he c k

XXXX----Boa rd ( Left )Conne c to r c he c kBoa rd ( Left )Conne c to r c he c kBoa rd ( Left )Conne c to r c he c kBoa rd ( Left )Conne c to r c he c k

XXXX----Boa rd ( Left ) rep la c ementBoa rd ( Left ) rep la c ementBoa rd ( Left ) rep la c ementBoa rd ( Left ) rep la c ement

Add B (V ti l )Add B (V ti l )Add B (V ti l )Add B (V ti l )


43/79


X C ANVAS


CANVASX

Address Bar (Vertical )Address Bar (Vertical )Address Bar (Vertical )Address Bar (Vertical )

st ripe in rightst ripe in rightst ripe in rightst ripe in right----2 / 5 a rea2 / 5 a rea2 / 5 a rea2 / 5 a rea

XXXX----Boa rd ( Left ) powe r supp ly c he c kBoa rd ( Left ) powe r supp ly c he c kBoa rd ( Left ) powe r supp ly c he c kBoa rd ( Left ) powe r supp ly c he c k

XXXX----Boa rd ( Left ) Conne c to r c he c kBoa rd ( Left ) Conne c to r c he c kBoa rd ( Left ) Conne c to r c he c kBoa rd ( Left ) Conne c to r c he c k

XXXX----Boa rd ( Left ) rep la c ementBoa rd ( Left ) rep la c ementBoa rd ( Left ) rep la c ementBoa rd ( Left ) rep la c ement

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


44/79


X C ANVAS


CANVASX

XXXX----Boa rd ( Right ) powe r supp ly c he c kBoa rd ( Right ) powe r supp ly c he c kBoa rd ( Right ) powe r supp ly c he c kBoa rd ( Right ) powe r supp ly c he c k

XXXX----Boa rd ( Right )Conne c to r c he c kBoa rd ( Right )Conne c to r c he c kBoa rd ( Right )Conne c to r c he c kBoa rd ( Right )Conne c to r c he c k

XXXX----Boa rd ( Right ) rep la c ementBoa rd ( Right ) rep la c ementBoa rd ( Right ) rep la c ementBoa rd ( Right ) rep la c ement

left 3 / 5 of s cr een with ve rtic a l st ripesleft 3 / 5 of s cr een with ve rtic a l st ripesleft 3 / 5 of s cr een with ve rtic a l st ripesleft 3 / 5 of s cr een with ve rtic a l st ripes

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



45/79


X C ANVAS


CANVASX

XXXX----Boa rd ( Right ) powe r supp ly c he c kBoa rd ( Right ) powe r supp ly c he c kBoa rd ( Right ) powe r supp ly c he c kBoa rd ( Right ) powe r supp ly c he c k

XXXX----Boa rd ( Right )Conne c to r c he c kBoa rd ( Right )Conne c to r c he c kBoa rd ( Right )Conne c to r c he c kBoa rd ( Right )Conne c to r c he c k

XXXX----Boa rd ( Right ) rep la c ementBoa rd ( Right ) rep la c ementBoa rd ( Right ) rep la c ementBoa rd ( Right ) rep la c ement


left 3 / 5 of s cr een with ve rtic a l st ripes.left 3 / 5 of s cr een with ve rtic a l st ripes.left 3 / 5 of s cr een with ve rtic a l st ripes.left 3 / 5 of s cr een with ve rtic a l st ripes.

No RedNo RedNo RedNo Red


46/79


X C ANVAS


CANVASX

no Red ( B o r G )no Red ( B o r G )no Red ( B o r G )no Red ( B o r G )

Be su re not to bend it by fo rc e o r inte rna lBe su re not to bend it by fo rc e o r inte rna lBe su re not to bend it by fo rc e o r inte rna lBe su re not to bend it by fo rc e o r inte rna lInsu lated c ondu c to r c an be down.Insu lated c ondu c to r c an be down.Insu lated c ondu c to r c an be down.Insu lated c ondu c to r c an be down.

Test Mon ito r ind ividua lly.Test Mon ito r ind ividua lly.Test Mon ito r ind ividua lly.Test Mon ito r ind ividua lly.

If dete c t a p rob lem with mon ito r, c he c k VSC Boa rd.If dete c t a p rob lem with mon ito r, c he c k VSC Boa rd.If dete c t a p rob lem with mon ito r, c he c k VSC Boa rd.If dete c t a p rob lem with mon ito r, c he c k VSC Boa rd.

If it has a p rob lem with STB c onne c ting, fo c us on 25 P in.If it has a p rob lem with STB c onne c ting, fo c us on 25 P in.If it has a p rob lem with STB c onne c ting, fo c us on 25 P in.If it has a p rob lem with STB c onne c ting, fo c us on 25 P in.

Be su re not to c onne c t 5 P in (APBe su re not to c onne c t 5 P in (APBe su re not to c onne c t 5 P in (APBe su re not to c onne c t 5 P in (AP---- EA#0) by fo rc eEA#0) by fo rc eEA#0) by fo rc eEA#0) by fo rc e

25 25 25 25 P in Cab le P /N o : G VZ APP in Cab le P /N o : G VZ APP in Cab le P /N o : G VZ APP in Cab le P /N o : G VZ AP---- EA#0EA#0EA#0EA#0

No RedNo RedNo RedNo Red

1) X - Board COF Connector separation

42424242 InchInchInchInch


47/79


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


48/79


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


49/79


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


50/79


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

WarningWarning COF Connector

5) Connector separation Guide


51/79


Push LOCK and pull out

PUSH PUSH PUSH

5) Connector separation Guide

PUSH PUSH PULL

6) Control Board & VSC Board Connector


52/79


)

7) Gas injection (Sealing up) condition


53/79


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

8) Power off in 2 ~ 3 minutes(Protection)


54/79


Power is On and off 2~3 minutes.(Protection)

Power is On and off 2~3 minutes.(Protection)

P301 Connector Open Check.P301 Connector Open Check. X - Board Top Right Change.X - Board Top Right Change.

P302 Connector Open CheckP302 Connector Open Check X - Board Top Left Change.X - Board Top Left Change.

P303 Connector Open CheckP303 Connector Open Check



X - Board Bottom Right Change.X - Board Bottom Right Change.

X - Board Bottom Left Change.X - Board Bottom Left Change.

Z - Board Change.Z - Board Change.

P3, P2 Connector Open CheckP3, P2 Connector Open Check Y - Board Change. Y - Board Change.

P005, P003 Connector Open CheckP005, P003 Connector Open Check


VSC- Board Change.VSC- Board Change.

VSC - Board Change.Sound Output IC Short Check

VSC - Board Change.Sound Output IC Short Check

Power Board ChangePower Board Change

OK

OK

OK

OK

OK

OK

OK

OKPROTECT operation;

When the load voltage is short.

When each voltage doesnt work (in general)

PROTECT operation;

When the load voltage is short.

When each voltage doesnt work (in general)

) ( )

9) Power off in 2 ~ 3 minutes(Protection)


55/79


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


56/79


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 or RED or BLUE or GREEN

Top Right Top Left

Bottom Right Bottom Left

11) One Point Service Guide


57/79


Symptom : B color 1 Address line OpenCause : Dented COF

COF is dented


58/79


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


59/79


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


60/79


CheckCheck

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.


61/79


CheckCheck

Pinkish screen in the top left.(Top right X-BOARD)


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.


62/79


CheckCheck

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 rightX-Board.

No Va(70V) supply to Top

right X-Board.

Connect 12V line

Connect 70V line


63/79


CheckCheck

The 3/5 top right of the screen is blank.(Top left X-BOARD)


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.


64/79


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.



65/79


CheckCheck

The 3/5 bottom left of screen is broken.(BOTTOM RIGHT X-BOARD)


No 5V supply to bottom rightX-Board.

Connect 5V line

Check Bottom right X-BOARD 5V.( If 0V, it happens )



66/79


CheckCheck

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 rightX-Board.

No Va(70V) supply to bottom

right X-Board.

Connect 12V line


67/79


CheckCheck

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 leftX-Board.

Connect 5V line


68/79


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 )




69/79


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.


ExamplesExamplesExamplesExamples


70/79



71/79


CheckCheck

Screen is divided in top and bottom, and vertical bar appears.

Connector(P13) is OPEN orConnecting condition is bad

Reassemble P13.

P13 CONNECTOR contact point inferior CHECK.

P13 CONNECTOR SIGNAL CHEK.

P13 CONNECTOR



72/79


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



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CheckCheck

The screen is bluish(Mosaic screen)

Loose VSC Board Connector Reassemble VSC BOARDConnector

Check the connection condition of the Connector.

Reassemble the Connector.



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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


ExamplesExamplesExamplesExamples


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IC201(VPC3230D) Decoder is inferior


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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

Symptom CauseCountermeasure

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 getshigh temperature, you can observe it(In normal temperature its O.K. )

F IC2 DA1(Data Arrange) No.162 Pin output is changingdepending on the temperature. G abnormal X-Bd Buffer IC

* Room temperature : 2.5V Output (Normal Pin = over 2.8V)* Heated : 1.5V Output(Normal Pin = 2.7V )

GGGG Bad IC2 (DA1)

< Waveform of normal pin>HHHH heated

< Waveform of abnormal pin >HHHH heated

DA1

Buffer

DA1

Buffer

Buffer(74ACT541) waveform abnormally narrows.IIII In this case, it is impossible for Flip Flop(74AC574) onX 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

F the output of inferior line less than that of the normal Line Add. COF Drive IC inferior F

COF inspectionJKL

: 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 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

42 inch pdp training manual

Documents