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LG D237IPS Service Manual Download Page 14

- 14 -

Copyright © 2011 LG Electronics. Inc. All right reserved.
Only for training and service purposes

LGE Internal Use Only

5.Standard of Auto/Manual equipment adjustment

*Note 1 (Test condition):

- mode12(1920x1080 @60Hz), 
- Burst pattern
- 230Vac @50Hz
- Analog & Digital & HDMI
- After aging 30min 

Summary of Contents for D237IPS

Page 1: ...R SERVICE MANUAL North Latin America http aic lgservice com Europe Africa http eic lgservice com Asia Oceania http biz lgservice com CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS NO LM94H MODEL D237IPS Internal Use Only ...

Page 2: ...served Only for training and service purposes LGE Internal Use Only CONTENTS CONTENTS 2 PRECAUTION 3 SERVICING PRECAUTIONS 4 SPECIFICATIONS 6 TIMING CHART 10 ADJUSTMENT 11 BLOCK DIAGRAM 15 TROUBLE SHOOTING 20 EXPLODED VIEW 24 SCHEMATIC CIRCUIT DIAGRAM ...

Page 3: ...he module from the ESD as it may damage the electronic circuit C MOS Make certain that treatment person s body are grounded through wrist band Do not leave the module in high temperature and in areas of high humidity for a long time The module not be exposed to the direct sunlight Avoid contact with water as it may a short circuit within the module If the surface of panel become dirty please wipe ...

Page 4: ...any electrostatic charge on your body by touching a known earth ground Alternatively obtain and wear a commercially available discharging wrist strap device which should be removed to prevent potential shock reasons prior to applying power to the unit under test 2 After removing an electrical assembly equipped with ES devices place the assembly on a conductive surface such as aluminum foil to prev...

Page 5: ...the solder joints of the two original leads If they are not shiny reheat them and if necessary apply additional solder Fuse and Conventional Resistor Removal Replacement 1 Clip each fuse or resistor lead at top of the circuit board hollow stake 2 Securely crimp the leads of replacement component around notch at stake top 3 Solder the connections CAUTION Maintain original spacing between the replac...

Page 6: ... Black Pin Triple Row 15 Pin D Sub 8 Cable Length 1 50 m 0 03 m DVI Shape Detachable Type Color Black EAD57760001 Pin Triple Row 18 Position DVI D 9 Power LPB LED Power B D Lienchang EAY62208902 10 3D Glasses Plastic Frame Type Clip Type EBX61588301 No Item Content Remark Width W Length D Height H 1 Product Before Packing 556 2 mm 60 4 mm 345 1 mm Without stand Dimension 556 2 mm 177 8 mm 412 7 mm...

Page 7: ...yp 5 Max 8 Optimal viewing Distance 50 cm 90 cm 4 Engineering Specification 1 Supported Sync Type Separate Sync Digital 2 Operating Frequency Analog Horizontal 30 83kHz Digital Vertical 56 75 Hz HDMI Horizontal 30 83kHz Vertical 56 61 Hz 3 Resolution Analog Max 1920 x 1080 60 Hz Digital Recommend 1920 x 1080 60 Hz HDMI Max 1920 x 1080 60 Hz Recommend 1920 x 1080 60 Hz 4 Input Voltage Voltage 100 2...

Page 8: ...Distance from The Right of Active Area to the Bezel C The Distance from The Top of Active Area to the Bezel D The Distance from The Bottom of Active Area to the Bezel C B D A Active Area Bezel No Item Content Remark Maker LGD Type TFT Color LCD Module Active Display Area 58 42 cm 23 inches diagonal Pixel Pitch mm 0 2652 H x 0 2652 V 1 LCD Module Electrical Interface 2ch LVDS Feature Color Depth 6b...

Page 9: ...Bytes 6 1 1 EDID Ver 1 3 FOR ANALOG 128Byte 6 1 2 EDID Ver 1 3 FOR DIGITAL 128Byte 6 1 3 EDID Ver 1 3 FOR HDMI 256Byte 9 Copyright 2011 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 7 IPS ...

Page 10: ... 10 Copyright 2011 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only TIMING CHART 1 Signal Video Sync 2 H V Timing ...

Page 11: ...mode EEPROM is initialized when AC Power is ON first If the change of FOS data is needed after M P it is possible by writing Mode Data with EEPROM write command or modifying the Mode Data in MICOM itself Caution Must keep power on more than 3 seconds after AC Power on first time 3 2 4 Color coordinates adjustment and Luminance adjustment 3 2 4 1 Color coordinates adjustment Monitor Contrast Bright...

Page 12: ...eriodically when there is Process change or Adjustment setting change 3 2 5 5 OSD Adjustment device Confirmation Confirm operation mentioned as product spec Vary Brightness and Contrast and confirm the variation of Luminance and display status Operate the f engine function and confirm variation of Luminance Make sure to do FACTORY RESET after confirmation of OSD function 3 2 5 6 Confirm the displa...

Page 13: ...t video signal Pattern 1 FULL WHITE Don t display other Character except for White Pattern Pattern 3 FULL WHITE Pattern 4 Cross hatch pattern Horizontal 10Line Vertcial 8Line Rectangle Pattern Pattern 5 1 Dot on 1 Dot off Rectangle Pattern Pattern 6 Vertical Sync only input Use signal cable of which Pin 5 is GND Pattern 7 Horizontal Sync only input Use signal cable of which Pin 5 is GND Pattern 8 ...

Page 14: ...nc All right reserved Only for training and service purposes LGE Internal Use Only 5 Standard of Auto Manual equipment adjustment Note 1 Test condition mode12 1920x1080 60Hz Burst pattern 230Vac 50Hz Analog Digital HDMI After aging 30min ...

Page 15: ...BLOCK DIAGRAM Main 15 Copyright 2011 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 16: ... Part 5VS source It Øs supplied by LPB LED Power Board Module eeprom IC and pull up use this source 3 3V 1 2V source It is consists of LDO that transfer 5VS to 3 3V and 1 2V and the Scalar IC Flash IC use those source 3 MICOM Part MICOM part is embedded in Video control part and It is consists of EEPROM that storage system control data CODE memory MICOM and reset IC First MICOM Judges input signal...

Page 17: ... 17 Copyright 2011 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only LPB BLOCK DIAGRAM Power Side ...

Page 18: ... 18 Copyright 2011 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only LPB BLOCK DIAGRAM LED Driver Side ...

Page 19: ...of RC circuit deleting Peak Noise 5 MAIN TRANSFORMER This change primary High Voltage to designed secondary low Voltage 6 19V 5V RECTIFIED AND FILTER CIRCUIT This regulate DC Voltage to input at Transformer for stable secondary voltage 7 SWITCHING PWM CONTROL This transfer primary DC Voltage to main transformer after switching effectively 8 FEEDBACK This is circuit to use circuit control circuit p...

Page 20: ...TROUBLESHOOTING GUIDE 20 Copyright 2011 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 1 NO POWER ...

Page 21: ... 21 Copyright 2011 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 2 NO RASTER OSD IS NOT DISPLAYED LPB ...

Page 22: ... 22 Copyright 2011 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 3 NO RASTER OSD IS NOT DISPLAYED MAIN ...

Page 23: ...ining and service purposes LGE Internal Use Only 4 TROUBLE IN DPM TROUBLE IN DPM CHECK PC PC IS GOING INTO DPM MODE NO CHECK H V SYNC LINE NO YES CHECK R577 AND R579 SYNC APPEARED CHECK SYNC PULSE YES 1 H SYNC 2 V SYNC Waveforms 1 2 TROUBLE IN IC500 IC500 PIN22 H PIN21 V ...

Page 24: ...l parts in this chassis have special safety related characteristics These parts are identified by in the Schematic Diagram and EXPLODED VIEW It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent X RADIATION Shock Fire or other Hazards Do not modify the original design without permission of manufacturer IMPORTANT SAFETY ...

Page 25: ...Copyright ⓒ 2011 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 26: ...Copyright ⓒ 2011 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 27: ...Copyright ⓒ 2011 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 28: ...Copyright ⓒ 2011 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

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