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Sky PDS4250 Service Manual Download Page 59

Trouble Shooting

-58-

4-2-8. The screen has one or several vertical line

(1) In this case, It isn’t a problem about controller B/D or XB/D.
(2) It may cause followings.

- It’s out of order a panel
- Open or short of DATA COF FPC attached panel
- It’s out of order a DATA COF attached panel

(3) Replace Module.

* Screen Display Form

4-2-9. The screen has one or several horizontal line

(1) In this case, it isn’t a problem about controller B/D or XB/D.
(2) It may cause followings.

- It’s out of order a panel
- Open or short of SCAN FPC attached panel
- It’s out of order a SCAN IC attached panel

(3) Replace Y DRV B/D

* Screen Display Form

4-2-10. The screen displays input signal pattern but the brightness is dark

(1) In this case, Z B/D operation isn’t complete.
(2) Check the power cord of Z B/D.
(3) Check the connector of Z B/D and Controller B/D.
(4) Replace the Controller B/D or Z B/D.

Summary of Contents for PDS4250

Page 1: ...42 PLASMA PDP MONITOR CHASSIS SP 120 MODEL PDS4250 NOV 2003 ...

Page 2: ...s 19 6 Adjusting Method 6 1 Adjusting WHITE BALANCE 23 6 2 Adjusting POWER PCB 23 7 SOFTWARE UPGRADE Method 25 8 Main PCB Trouble Diagnosis 28 8 1 VIDEO JACK PCB Trouble Diagnosis 28 8 2 POWER PCB Trouble Diagnosis 33 9 TROUBLE SHOOTING 9 1 Facts You Must Know When Diagnosing And Repairing 34 9 2 Representative Symptoms When Each PCB Breaks Down 34 9 3 Trouble Diagnosis And Repairing Method For Re...

Page 3: ...Data copy is generated to stripe direction 57 4 2 8 One or more stripe is generated on the screen 58 4 2 9 One or more horizontal line is generated on screen 58 4 2 10 Lightness of screen is wholly darken though there is input signal pattern 58 4 2 11 Different color is shown partially during full white screen or electric discharge is generated during full black screen 59 4 2 12 Full white pattern...

Page 4: ...sure to check if any screw is missing when assembling 5 If you open the BACK COVER you will see a Panel Gas Exhaust Tube Fig 1 If this part is damaged entire PDP PANEL must be replaced Therefore when working be careful not to damage this part Fig 1 Panel Gas Exhaust Tube 6 A PDP Set contains a different kind of connector cables When connecting or disconnecting connector cables check the direction ...

Page 5: ...C4 43 S VHS 50 60Hz Y C 1 PORTS SCART CVBS RGB 2 PORTS 3 2 DTV DVD INPUT 1080i 720P 480P 480i Y Pb Cb Pr Cr COMPONENT SIGNAL 2 PORTS 3 3 PC INPUT VGA UXGA 15 PIN D SUB 1 PORT 3 4 DVI INPUT DVI D DVI JACK 1 PORT 3 5 SOUND INPUT VIDEO 3 PORTS DTV DVD 2 PORTS PC 1 PORT DVI 1 PORT 3 6 SPEAKER OUTPUT 8W R 8W L 3 7 POWER REQUIREMENT AC 100V 240V 50 60Hz 3 8 POWER CONSUMPTION 320W 3 9 RS 232 CONTROL COMM...

Page 6: ... 7 CONTRAST RATIO 1000 1 NO 8 4 8 VIEWING ANGLE 160 VERTICAL HORIZONTAL 5 USERCONTROL ACCESSORIES 5 1 CONTROL BUTTON SET AC POWER BUTTON PUSH PULL S W MENU SELECT UP DOWN LEFT RIGHT SOFT S W 5 2 REMOTE CONTROL POWER INPUT SELECT CONFIRM or OK R V2A02 EXTENSION EXTENSION MENU UP DOWN VOLUME UP VOLUME DOWN SILENCE PICTURE MODE PICTURE STILL PICTURE SIZE SOUND MODE TIMER SLEEP 5 3 ACCESSORIES REMOTE ...

Page 7: ...5 0 PAL 950 800x600 35 156 56 3 VESA 23 35 16 57 2 VESA 24 37 879 60 3 VESA 24 48 077 72 2 VESA 25 46 875 75 0 VESA 26 53 674 85 1 VESA 27 832x624 49 726 74 0 Macintosh 28 1024x768 48 193 48 077 59 3 59 8 Macintosh OAK 29 48 363 60 0 VESA 30 53 95 66 1 XGA 890 56 476 70 1 HP VESA 31 60 241 74 9 74 6 Macintosh 32 60 023 75 0 VESA 33 68 677 85 0 VESA 34 80 66 100 0 Fujitsu 939 70 84 84 0 SUN 926 115...

Page 8: ...VAX 937 74 88 70 0 NEC 921 78 125 72 0 HP HITA 206 78 855 74 1 Sony NEC 46 79 976 75 0 VESA 47 81 13 76 1 SUN 927 91 146 85 0 VESA 48 1600X1200 62 5 48 0 VESA 75 60 0 VESA 50 81 25 65 0 VESA 862 87 5 70 0 VESA 863 93 75 75 0 VESA 864 100 80 0 VESA 865 2 DTV 1080i 60 Hz 720P 60 Hz 480P 60 Hz 3 VIDEO PAL PAL M PAL N NTSC NTSC4 43 SECAM ...

Page 9: ... 8 3 BLOCK DIAGRAM ...

Page 10: ...V_MUTE DVS DHS GCLK GHS GVS GCOAST VIN R_OUT L_OUT RIGHT LEFT GREF VPEN DECOE YCOMB CCOMB IR LED_P GND GND GND E33V STB5V COLUM1 COLUM2 COLUM3 DATA1 DATA2 1 5 4 3 2 1 5 4 3 2 6 1 40 2 39 PA4 PA5 P603 1 6 7 8 9 5 3 4 2 NUL P12V P12V GND GND P5V GND GND LED_P LED_P POWER_CLT GND GND GND GND GND GND RD2 RD1 RD1 RD2 RD2 DISPEN SCLK GND RC2 RB2 RC2 RB1 RB RA1 RB2 RA2 RA1 RC RC RA2 RCLK2 RCLK1 RCLK2 RCL...

Page 11: ...ng 3D COMBFILTER to separate COMPOSITE signal to Brightness Signal Y and Color Signal C TP Input COLOR BAR PATTERN A YCOMP Brightness Signal Y B CCOMP Color Signal C 2 IC401 SAA7118E Receive NTSC SECAM PAL VIDEO by COMPOSITE V S VHS Y C COMPONENT Y Cb Cr and process signal TP A DECOE CHIP ENABLE part When signal process is done by IC401 DC 3 3V is measured ...

Page 12: ...Each BLOCK 3 IC406 DPTV MVS A Scan Rate Converter which converts Interlace signal into Progressive signal TP A VVS VERTICAL SYNC output of DPTV MVS B VHS HORIZONTAL SYNC output of DPTV MVS C VCLK CLOCK output of DPTV MVS ...

Page 13: ... IC500 CXA3516R 3 channel 8 bit 165MSPS A D converter which process PC DTV signal TP A GCOAST COAST CONTOL Signal for PLL input of CXA3516 B GHS HORIZONTAL SYNC for GRAPHIC output of CXA3516 C GCLK CLOCK for GRAPHIC output of CXA3516 ...

Page 14: ... 13 Description Of Each BLOCK D GFBK SYNC for PLL 5 IC600 PW171 Image processor IC TP A DEN DATA ENABLE output of PW171 B DHS HORIZONTAL SYNC output of PW171 ...

Page 15: ...1 IC706 VIDEO SYNC SELECTOR This chooses Y Cb Pb Cr Pr or RGB signal to output Y Cb Pb Cr Pr to separate SYNC and to perform SYNC COUNTER 2 IC704 AUDIO VIDEO SWITCH The IC perform AUDIO or VIDEO SWITCHING 3 IC715 DIGITAL CONTROLLER DVI CONTROLLER 4 IC721 INPUT SELECTOR SWITCH SCART RGB SELECTOR SWITCH 5 IC700 MULTI STANDARD SOUND PROCDSSOR AUDIO SINGNAL VOLUME control EQUALIZER control ...

Page 16: ...K TP R_OUT L_OUT AUDIO SIGNAL that goes into MSP3420 before AUDIO PROCESSING 4 IC701 IC700 TDA 7480 TP A RIGHT LEFT AMP input signal before 30dB amplification 4 1 4 KEY PCB Input PCB using KEY 4 1 5 LED PCB PCB for REMOCON CONTROL ...

Page 17: ...le Noise Name Voltage range accuracy current range mVp p 2 V V 1 A A 1 Vsus 190 180 195 5V 1 3 0 1 1 3 1000 500 2 Vadd 60 50 80 2V 1 0 1 1 250 500 3 V1 5 1 5 2 5 0 1 3 50 100 4 V3 17 5 1 0 1 50 100 SOUND 17 5 1 0 1 50 100 5 V4 5 0 5 1 5 0 1 1 5 50 100 6 V5 12 5 0 6 0 1 50 100 7 Vstb 5 5 1 5 0 1 5 100 100 Connector number P2 P3 P6 Model name GP390 10P TS 1 1123723 8 GP390 04P TS Maker LG Cable AMP ...

Page 18: ...F V3 17V 2 NC NC G 3 V5 12V NC G 4 G G V3 17V 5 G Vstb 6 V4 5V 7 G 8 G 9 NC 10 NC Pin number P2 is connected to P5 of Y SUS PCB P3 is connected to P1 of Z SUS PCB P6 is connected to P6 of Y SUS PCB P4 is connected to PA4 of VIDEO PCB P5 is connected to PA5 of VIDEO PCB P7 is connected to PA6 of JACK PCB Applied Voltage level is specified at the time when full white pattern displayed on panel ...

Page 19: ...t SHARPNESS 4 Color Temp Normal 2 Sound Balance 0 CENTER Spatial Effect Off Sound Mode Normal 120 Hz 0 CENTER 500 Hz 0 CENTER 1 5 KHz 0 CENTER 5 KHz 0 CENTER 10 KHz 0 CENTER 3 Screen Mode Auto 4 Utility Background Opaque Language English selected when Power ON by user just after manufacturing ISM Pixel Shift Off Low Bright Off Image Invert Off 5 Input DSP 4222 AV1 SCART DSP 4220 24 VIDEO1 2 Check ...

Page 20: ...FT OFF 7 PANEL ISM OFF BWINV OFF GAMMA 2 1 BRIGHT 100 SCROLL OFF P SAVE 75 MOVING AV STILL PC 5 3 Description of SERVICE MODE Items 1 PW171 It is a Image processor and used to adjust White balance Note This article is for adjustment after replacement of VIDEO PCB These values may vary from set to set Therefore if these values are recorded before replacing VIDEO PCB you do not need to adjust WHITE ...

Page 21: ...VIDEO fixed 3 DPTV Be used to adjust DEINTERLACE performance Note This article is not for adjustment after replacement of VIDEO PCB Therefore do not change initial values 1 SUB BRT For BRIGHTNESS adjustment VIDEO DVD fixed 2 SUB CONT For CONTRAST adjustment VIDEO DVD fixed 3 50P ON for 50Hz OFF for 60Hz fixed 4 CXA3516 It is a DTV PC PROCESSOR and used to adjust a picture quality for DTV PC Note T...

Page 22: ...ed screen like PC screen When this function is ON the screen will move a little for every fixed interval but a human eye can not recognize it well 7 INFOR 1 VER MICOM VERSION year 4 digits month 2 digits date 2 digits and time 4 digits 200309222030 8 RESET 1 EDID SET Note Be used to set to write EDID data After setting it is changed to EDID DONE Before setting EDID you have to short jumpers of JP7...

Page 23: ...oves1 8 pixel with a regular rule up down left right every 10 sec 6 BRIGHT Adjusting Peak Luminance 7 P SAVE Controlling power consumption by changing Luminance level of whole screen 1 100 Peak Luminance Maximum Power Consumption mode 2 87 87 mode 3 75 75 mode 4 50 50 mode 5 linear linear mode Constant luminance without regard to APL WARNING The choice of these modes can cause difference of Power ...

Page 24: ... beyond these then that is a specification fault Coordinate of Color is x 0 270 0 005 y 0 300 0 005 8 Repeat No 4 to No 7 until getting that Coordinate of Color is x 0 270 y 0 300 and then adjust Sub Contrast to over 100 Cd m square after attaching a sensor of White Balance Meter to 100 of white level on the screen 9 To exit from Service mode press Menu button on the remote controller 6 2 POWER AD...

Page 25: ... Points 2 Vadd ADDRESS Voltage DATA Input Voltage Measurement equipment Digital Volt Meter DC Volt mode Adjusting TP TP206 See Fig 4 Adjusting Location RV204 See Fig 4 Optimum Adjusting Voltage Voltage which is written in Label which is at upper right side of PDP Module Typical Voltage 65 V Fig 3 ...

Page 26: ...ct 9 PIN serial cable to the serial port of the computer 3 Connect the opposite end of the serial cable to RS 232C port of Jack PCB 4 Run Flashupgrader exe in PC and then push Next N button 5 Select current Upgrade file Click Browse button to select the file you want to upgrade ...

Page 27: ... 26 SOFTWARE UPGRADE Method Select the file pwSDK inf you want to upgrade and Push Open O button 6 Select as above and push Next N button 7 Select Comm Port and Baud Rate and push Next N button ...

Page 28: ...thod 8 Upgrade process will be displayed Turn on the ac power and then upgrade program will initiate the download 9 When all files upgrade are complete a window below will be opened Push Finish button to complete the process ...

Page 29: ...Is the signal input Jack correctly connected Does input source AV device operate Is input selection in used mode Confirm input selection Exchange Video or Jack PCB Check the connection of Jack PDP or AV devide 1 Confirm AC connection 2 Confirm Power S W ON 3 Check other PCBs Refer to II Parts of Module Check P31 Exchange Video PCB Is P604 correctly connected Is there a weak discharge on the screen...

Page 30: ...ar on screen 1 Input PC or VIDEO signal and see if PC or VIDEO signals shown on screen If no signal check TP DCLKB DHS and DVS If DCLKB DHS and DVS signal do not appear VIDEO PCB has a trouble 2 Check P502 s 1st PIN V SYNC 2nd PIN H SYNC check when 1080i S VHS input Check 24th pin of P502 when COLOR BAR PATTERN If above signal do not appear JACK PCB has a trouble If above signals do not appear JAC...

Page 31: ...nal do not appear JACK PCB has a trouble 5 When No Sound 4 When PC signal do not appear on screen 1 Input DTV or VIDEO signal and see if DTV or VIDEO signals shown on screen If no signal check TP DCLKB DHS and DVS If DCLKB DHS and DVS signal do not appear JACK PCB has a trouble 2 Check 1st PIN V SYNC 2nd PIN H SYNC of P502 when 800 600 ...

Page 32: ... AC connection 2 Confirm Power S W ON 3 Check other PCBs 1 Check the connection to Video PCB 2 Check the Video PCB or other PCBs 1 PA601 CONNECTOR has a trouble 2 Exchange Key PCB Does LED turn on in Green Does LED next to Power S W turn on in Red Is 2nd pin of P601 output normal Check VIDEO PCB ...

Page 33: ...he Battery of Remote Controller 1 Check the connection to VIDEO PCB 2 Check VIDEO PCB LED PCB has a trouble So Exchange LED PCB Does Remote Controller operate Does Set turn on with Key operation 1 IR Receiving BLOCK of VIDEO PCB has a trouble 2 Check VIDEO PCB Whenever push the botton of remote controller does 2nd Pin of P602 output 7 When Remote Controller does not operate ...

Page 34: ...ltage table lists 3 7 are NOT normal Or when set to high voltage output voltage table list 1 2 are NOT normal Refer to 4 2 When output condition of Power Module is set to low voltage output voltage table lists 3 7 are normal But when set to high voltage output voltage table list 1 2 are NOT normal Refer to 4 2 After turn on the PDP set with Remote Controller when output condition of Power Module i...

Page 35: ...ric screwdriver plastic adjusting tool 6 Each BLOCK operation was explained including DIGITAL OSCILLOSCOPE signal but this is reference only and applying them for repair is not necessary After additional education DIGITAL OSCILLOSCOPE could be used 7 Before assemble disassemble PCBs check to see if AC Switch is OFF 8 After replacing Z SUS Y SUS POWER VIDEO PCB the PCB needs extra adjustment Refer ...

Page 36: ...Procedure As shown in Fig 5 first check which of LOW VOLTAGE part or HIGH VOLTAGE part has a trouble If LOW VOLTAGE part is broken is checked as shown in Fig 6 diagnose the SET and then replace the broken PCB If HIGH VOLTAGE part is broken is checked as shown in Fig 7 diagnose the SET and then replace the broken PCB Note 1 When disconnecting connecting connectors you must turn OFF the AC power and...

Page 37: ...s NO YES AC PWR OFF BACK COVER OPEN AC PWR ON PWR ON with Remote Controller SHUT DOWN occur LOW VOLTAGE part is N G PCB check priority Controller VIDEO or JACK POWER Trouble Diagnosis in order shown as Fig 6 HIGH VOLTAGE part is N G PCB check priority Z SUS Y SUS SCAN DATA POWER Trouble Diagnosis in order shown as Fig 7 POWER PCB s HIGH VOLTAGE SWITCH OFF refer to Fig 4 ...

Page 38: ...tors of Z SUS and Y SUS AC PWR ON PWR ON with Remote Controller SHUT DOWN occur AC PWR OFF AC PWR OFF Disconnect AUDIO PWR Connector of JACK PCB Reconnect only PWR Connector of Z SUS AC PWR ON PWR ON with Remote Controller AC PWR ON PWR ON with Remote Controller SHUT DOWN occur SHUT DOWN occur VIDEO or JACK PCB is N G Z SUS PCB is N G or Controller Y SUS or SCAN PCB is N G JACK PCB is N G ...

Page 39: ...of POWER PCB ON refer to Fig 4 Disconnect PW R Connector s of Z SUS and Y SUS AC PWR ON PWR ON with Rem ote Controller SHUT DOWN occur NO POWER PCB is N G AC PWR OFF Reconn ectonly PWR Connector of Z SUS P102A AC PWR ON PWR ON with Remote Controller SHUT DOWN occur YES YES Z SUS PC B is N G NO Y SUSor SCAN PCB is N G ...

Page 40: ...5 X RIGHT PCB AS PDP42V50011 LG 11 PANEL GLASS 485AS01696 PANEL GLASS AS PDP42V50011 LG 12 CONNECTOR 4850710S06 GP390 10S GP390 10S ULW 400 13 CONNECTOR 4850708S11 1 1123723 8 1 1123723 8 ULW 500 14 CONNECTOR 4850704S48 GP390 04S GP390 04S ULW 400 15 CONNECTOR 4850710N08 YMH025 10R YMT025R ULW 500 16 CONNECTOR 4850705N27 YMH025 05R YMT025R ULW 500 17 CONNECTOR 4850708S12 12505HS 08 12505HS 08 ULW ...

Page 41: ... 40 ASSEMBLY LIST COMPONENTS PICTURE REMARK 1 PDP MODULE with F SUPPORT 2 VIDEO BOARD 3 JACK BOARD with JACK PLATE 4 POWER BOARD ...

Page 42: ... 41 ASSEMBLY LIST COMPONENTS PICTURE REMARK 5 FRONT MASK 6 FILTER GLASS 7 BACK COVER ...

Page 43: ... 42 ...

Page 44: ... the product is on It takes some time for the voltage to drop to a sufficiently low level after the power has been turned off Confirm that the voltage has dropped to a safe level before disconnecting or connecting the connector 6 Do not pull out or insert the power cable from to an outlet with wet hands It may cause electric shock 7 Do not damage or modify the power cable It may cause fire or elec...

Page 45: ...mages as much as possible and design your system so that it is used at a low luminance by reducing signal level difference between bright area and less bright area through signal processing 13 Because PDP Module emits heat from the Glass Panel part and the Drive circuitry the environmental temperature must not be over 40 C The temperature of the Glass Panel part is especially high owing to heat fr...

Page 46: ...s recommended to light all cells for about 2 hours aging 25 This product is made from various materials such as glass metal and plastic When discarding it be sure to contact a professional waste disposal operator 26 If faults occur due to arbitrary modification or disassembly LG Electronics is not responsible for function quality or other items 27 Use of the product with a combination of parameter...

Page 47: ...Description 1 6871QCH025A PWB PCB ASSY TMDS CTRL B D ASSY 2 6871QCH029A PWB PCB ASSY LVDS CTRL B D ASSY 3 6871QDH051A PWB PCB ASSY Y DRV UPPER B D ASSY 4 6871QDH052A PWB PCB ASSY Y DRV LOWER B D ASSY 5 6871QRH034A PWB PCB ASSY X RIGHT B D ASSY 6 6871QYH027A PWB PCB ASSY Y SUS B D ASSY 7 6871QZH030A PWB PCB ASSY Z SUS B D ASSY Fig 8 Connection diagram External Cable Connection ...

Page 48: ...odule adjustment should be followed by below sequence Setting up the initial voltage and adjusting the voltage wave form of Vsetup Measuring the Margin of Vs voltage and deciding the voltage Adjusting and checking the voltage of DC DC pack Vsetup Vscw Ve Vy Adjusting the voltage wave form of Vset down Measuring the voltage margin of Vset up and deciding the voltage Adjusting the wave form of final...

Page 49: ...y Within 1 for Vs Va within 3 for 5V 3 4 2 Connection diagram of measuring instrument and setting up the initial voltage 1 onnection diagram of measuring instrument Refer to Fig 8 Connection diagram of measuring instrument that adjusting the voltage wave form 2 Setting up the initial voltage Initially setting up voltage Vcc 5V Va 65V Vs 190V But Initially setting up voltage can be changed by the s...

Page 50: ...5V 1 Should be changeable more than 0 10V more than 10A DC DC Converter Jig 1 The Jig which has voltage equivalent output of PDP42V5 Module after taking the Vs Va 5V voltage Voltage stability of power supply Within 1 for Vs Va within 3 for 5V 3 5 2 Connection diagram of measuring instrument and setting up the initial voltage 1 Connection diagram of measuring instrument Refer to Fig 8 Connection di...

Page 51: ... to the voltage down direction and make the cell of screen turned off Turn the voltage adjusting knob of Vs DC power supply to the voltage up direction until the cell of screen turned on The first voltage which make the cell of full screen turned on is named as Vsmin1 and record it Turn the voltage adjusting knob of Vs DC power supply to the voltage up direction slowly until the cell of screen tur...

Page 52: ... on before turning on the power of DC power supply 2 The voltage of DC power supply in standard of Module input voltage should be preset as below Vcc 5V Va 65V Vs 190V 3 The power of power supply must turned on by this sequence Reverse direction When turning off Module on 5V Va Vs Module off Vs Va 5V 4 Signal generator should be selected with 852 480 mode WVGA ...

Page 53: ... is well plugged in 4 Check the connection of X B D Y B D and Z B D to CTRL B D 5 Measure the output wave of X Y Z B D with oscilloscope more than 200MHz and find the trouble of B D by comparing the output wave with below figure Measure Point fo Y B D TP Connector P4 80 pin Measure Point fo Z B D Connection part of panel SUS_OUT Measure Point fo X B D L1 RIGHT L2 LEFT BOTTOM 6 Check the SCAN Y sid...

Page 54: ...Trouble Shooting 53 ...

Page 55: ...D Screen X B D Left of the Screen 4 7 Right X B D Right of the Screen 3 7 Left X B D Screen Display Form 4 2 2 The screen doesn t be shown as Data COF Include not be shown part of Data COF quantity or a part 1 The problem between Data COF and X B D is more possible that the screen is not be shown as data COF 2 Confirm the connector of Data COF is well connected to X B D Correspond to the part that...

Page 56: ...re is problem in the check that is input into Data COF IC 2 In case of case 1 2 3 confirm the connection of Data COF connector replace the relevant X B D 3 In case of case 4 5 confirm the connector that is connected from CTRL to X B D Replace relevant XB D or CTRL B D Screen Display Form ANODE Pattern GND CATHOD Pattern and examine the Diode to the pure or reverse direction Measure the third resis...

Page 57: ...is conveyed from CTRL B D is not conveyed well 2 Confirm the XB D connection connector plugged in well Correspond to unusual screen 3 Replace relevant XB D or CTRL B D Relationship between screen and X B D Screen X B D Left Bottom of the Screen 4 7 Right X B D Right Bottom of the Screen 3 7 Left X B D Screen Display Form 4 2 5 The screen display has a problem for Scan FFC 1 It s may be a problem b...

Page 58: ... B D 2 Replace Control B D Screen Display Form 4 2 7 A data copy is happened into vertical direction 1 In this case it s due to incorrect marking of scan wave 2 Replace a Y DRV B D or Y SUS B D Screen Display Form Change the Vpp Pin into ANODE and GND Pin into CATHOD and then test the Diode with forward or reverse direction Check a method of SCAN IC ...

Page 59: ... screen has one or several horizontal line 1 In this case it isn t a problem about controller B D or XB D 2 It may cause followings It s out of order a panel Open or short of SCAN FPC attached panel It s out of order a SCAN IC attached panel 3 Replace Y DRV B D Screen Display Form 4 2 10 The screen displays input signal pattern but the brightness is dark 1 In this case Z B D operation isn t comple...

Page 60: ...B D set up Test up B C VR1 setdown Test down D VR2 and Z B D ramp Tramp F G VR3 declination by changing VR1 VR2 VR3 Measuring Point of Y B D P4 Connector P4 36 pin Measuring Point of Z B D B37 SUS_OUT 4 2 12 A center of screen is darker than a edge of screen at full white pattern 1 In this case it s a problem about Z B D ramp wave 2 Check the connection cable of Z B D and CTRL B D 3 Replace the Z ...

Page 61: ... 60 5 Block Diagram of Module ...

Page 62: ......

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