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LG FLATRON 27UD68WG Service Manual
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LG FLATRON 27UD68WG Service Manual

Color monitor chassis no.: lm55h
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COLOR MONITOR
SERVICE MANUAL
CHASSIS NO. : LM55H
MODEL:
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL68962209(1511-REV00)
North/Latin America
Europe/Africa
Asia/Oceania
27UD68
Internal Use Only
http://aic.lgservice.com
http://eic.lgservice.com
http://biz.lgservice.com
Printed in China

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Summary of Contents for LG FLATRON 27UD68WG

  • Page 1 Internal Use Only North/Latin America http://aic.lgservice.com Europe/Africa http://eic.lgservice.com Asia/Oceania http://biz.lgservice.com COLOR MONITOR SERVICE MANUAL CHASSIS NO. : LM55H 27UD68 MODEL: CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO : MFL68962209(1511-REV00) Printed in China...

  • Page 2: Table Of Contents

    SPECIFICATIONS..................6 TIMING CHART ..................11 ADJUSTMENT ..................14 BLOCK DIAGRAM...................18 TROUBLE SHOOTING ................19 EXPLODED VIEW .................. 22 SVC. SHEET ....................Copyright © 2010 LG Electronics. Inc. All right reserved. - 2 - LGE Internal Use Only Only for training and service purposes...

  • Page 3: Precaution

    CAUTION Please use only a plastic screwdriver to protect yourself from shock hazard during service operation. Copyright © 2010 LG Electronics. Inc. All right reserved. - 3 - LGE Internal Use Only Only for training and service purposes...

  • Page 4: Servicing Precautions

    Copyright © 2010 LG Electronics. Inc. All right reserved. - 4 - LGE Internal Use Only Only for training and service purposes...
  • Page 5 CAUTION: Maintain original spacing between the replaced component and adjacent components and the circuit board to prevent excessive component temperatures. Copyright © 2010 LG Electronics. Inc. All right reserved. - 5 - LGE Internal Use Only Only for training and service purposes...

  • Page 6: Specifications

    Length : 1.8m / Shape : Detachable Type / Color : black SET accessory / DP to Mini DP Weight : 0.105kg P/N : EAD63127601(Ver1.2) Copyright © 2010 LG Electronics. Inc. All right reserved. - 6 - LGE Internal Use Only Only for training and service purposes...
  • Page 7 SET accessory / PNo. : Stand Body MCK69106401 Cover SET accessory / PNo. : 100g Stand Body AAN75689001 Copyright © 2010 LG Electronics. Inc. All right reserved. - 7 - LGE Internal Use Only Only for training and service purposes...
  • Page 8 SET accessory / Refer to BOM Support FreeSync funct P/No Specification Applying module list New Blade 27” Module EAJ63750201 LM270WR3-SSA1 Copyright © 2010 LG Electronics. Inc. All right reserved. - 8 - LGE Internal Use Only Only for training and service purposes...
  • Page 9 Back cover : Black Glossy Appearance General Stand Body : Black hairline and Glossy Stand Base : Black hairline and Glossy Copyright © 2010 LG Electronics. Inc. All right reserved. - 9 - LGE Internal Use Only Only for training and service purposes...
  • Page 10 Full red pattern 0.250 0.652 0.334 0.307 GREEN 0.637 RGB COLOR coordi Typ-0.03 Typ+0.03 nates 0.150 BLUE 0.060 Copyright © 2010 LG Electronics. Inc. All right reserved. - 10 - LGE Internal Use Only Only for training and service purposes...
  • Page 11 3840×2160 @ 60Hz Resolution Single Recommend 3840×2160 @ 60Hz Max. 3840×2160 @ 60Hz USB -C Recommend 3840×2160 @ 60Hz Copyright © 2010 LG Electronics. Inc. All right reserved. - 11 - LGE Internal Use Only Only for training and service purposes...
  • Page 12 EPA6.0 test standard ERP A class / Condition : On/On Test video White 30.2W Outgoing condition Power rating 19V 2.0A Copyright © 2010 LG Electronics. Inc. All right reserved. - 12 - LGE Internal Use Only Only for training and service purposes...
  • Page 13 Game 2 / RTS Game/Custom(Game) Picture Super High/ Middle/ Low / Off / Picture Resolution Adjust 0 – 100 Sharpness Copyright © 2010 LG Electronics. Inc. All right reserved. -13 - LGE Internal Use Only Only for training and service purposes...
  • Page 14 Magenta Hue / Saturation : 0 – 100 Adjust Yellow Hue / Saturation : 0 – 100 Reset Reset / Cancel Copyright © 2010 LG Electronics. Inc. All right reserved. - 14 - LGE Internal Use Only Only for training and service purposes...
  • Page 15 Reset / Cancel 5.2 Open Source License If Need Open Source Use Manual License (in Web) Source (in Web) 27UD68 Copyright © 2010 LG Electronics. Inc. All right reserved. - 15 - LGE Internal Use Only Only for training and service purposes...
  • Page 16 C: The Distance from The Top of Active Area to the Bezel D: The Distance from The Bottom of Active Area to the Bezel Copyright © 2010 LG Electronics. Inc. All right reserved. - 16 - LGE Internal Use Only...
  • Page 17 Refer to variable data file Refer to variable data file Special Item 6.1.1.1 HDMI1 EDID (HDMI1.4) 1) Physical Address : HDMI1=10 Copyright © 2010 LG Electronics. Inc. All right reserved. - 17- LGE Internal Use Only Only for training and service purposes...
  • Page 18 2.1.1.2 HDMI2 EDID (HDMI1.4) 1) Physical Address : HDMI2=20 2.1.1.3 HDMI1 EDID (HDMI2.0) Copyright © 2010 LG Electronics. Inc. All right reserved. - 18- LGE Internal Use Only Only for training and service purposes...
  • Page 19 2.1.1.4 HDMI2 EDID (HDMI2.0) 2.1.2 DP EDID (DP1.2) Copyright © 2010 LG Electronics. Inc. All right reserved. - 19- LGE Internal Use Only Only for training and service purposes...
  • Page 20 2.1.3 DP EDID Of FREE-SYNC ON Copyright © 2010 LG Electronics. Inc. All right reserved. - 20- LGE Internal Use Only Only for training and service purposes...
  • Page 21 Check Sum Refer to variable data file Refer to variable data file 2.2.1.1HDMI PBP EDID 2.2.1.2 HDMI2 PBP EDID Copyright © 2010 LG Electronics. Inc. All right reserved. - 21- LGE Internal Use Only Only for training and service purposes...
  • Page 22 ** HDMI Physical address HDMI1 : 10 CHECKSUM 3F HDMI2 : 20 CHECKSUM 2F 2.2.1.3 DP PBP EDID Copyright © 2010 LG Electronics. Inc. All right reserved. - 22- LGE Internal Use Only Only for training and service purposes...

  • Page 23: Timing Chart

    3840 x 2160 V(Lines) 2160 1) PBP Recommended Timing (Only Supported at PBP mode.) 2) Main Recommended Timing Copyright © 2010 LG Electronics. Inc. All right reserved. - 23 - LGE Internal Use Only Only for training and service purposes...
  • Page 24 3840 x 2160 V(Lines) 2250 2160 1) PBP Recommended Timing (Only Supported at PBP mode.) 2) Main Recommended Timing Copyright © 2010 LG Electronics. Inc. All right reserved. - 24 - LGE Internal Use Only Only for training and service purposes...

  • Page 25: Adjustment

    -. HDCP 2.2 KEY (New, Refer to 27MU67 Writing process) a. Write HDCP Key into EEPROM by using DDC2AB protocol & HDCP Adjustment Jig equipment. If error is occurred, try to write again. Copyright © 2010 LG Electronics. Inc. All right reserved. - 25 - LGE Internal Use Only...
  • Page 26 *Note : 1) When in DC OFF Condition 2) and push the Menu Button and On Button at the same time for about 3 secoemd Copyright © 2010 LG Electronics. Inc. All right reserved. - 26 - LGE Internal Use Only...
  • Page 27 5. Shipping condition 비고 Item Content& Outgoing Condition Outgoing SOURCE HDMI1 Condition Power S/W Brightness Contrast Menu Volume Copyright © 2010 LG Electronics. Inc. All right reserved. - 27 - LGE Internal Use Only Only for training and service purposes...
  • Page 28 DisplayPort 1.2 Enable OSD Lock Operating Time Within 2Hours Make sure to do FACTORY RESET at the final process. Copyright © 2010 LG Electronics. Inc. All right reserved. - 28 - LGE Internal Use Only Only for training and service purposes...
  • Page 29 0x90 2:HDMI1 0x91 3:HDMI2 SYSTEM RESET Restart System 00:English, 0x00 ~ 01: German Select Language 0x0F 02: French Copyright © 2010 LG Electronics. Inc. All right reserved. - 29 - LGE Internal Use Only Only for training and service purposes...
  • Page 30 SyncFlags,HPeriodH, HPeriodL, VtotalH,VtotalL, SrcHTotalH, SrcHTotalL SrcHStartH, SrcHStartL, SrcVStartH,SrcVStartL, HsyncPhase Temporary Data write: Write to particular address of EEPROM. Copyright © 2010 LG Electronics. Inc. All right reserved. - 30 - LGE Internal Use Only Only for training and service purposes...
  • Page 31 START STOP L : 0x00~0x7F D : data 8-byte write START Data1 …. Data8 STOP L : 0x00,0x10,….0x70 Copyright © 2010 LG Electronics. Inc. All right reserved. - 31 - LGE Internal Use Only Only for training and service purposes...
  • Page 32 DDC2B Command.(A0/A1) START START Data1 . . . Data128 STOP - 128 Byte transfer of EDID Buffer of MICOM Copyright © 2010 LG Electronics. Inc. All right reserved. - 32 - LGE Internal Use Only Only for training and service purposes...

  • Page 33: Block Diagram

    BLOCK DIAGRAM (Main) Copyright © 2010 LG Electronics. Inc. All right reserved. - 33 - LGE Internal Use Only Only for training and service purposes...

  • Page 34: Trouble Shooting

    Is IC 400 CHECK IC400 PIN2(3.3V) Is IC200 CHECK CRYSTAL X200 PIN95,PIN96 PULSE CHECK IC200 X200 IC401-#2 IC401-#3 IC400 Copyright © 2010 LG Electronics. Inc. All right reserved. -34 - LGE Internal Use Only Only for training and service purposes...
  • Page 35 2. Trouble in IC200 12MHz CHECK CONNECTION From HDMI TO IC200 Is IC200 PIN3 PIN4 I2C Trouble in cable or LCD module Copyright © 2010 LG Electronics. Inc. All right reserved. -35 - LGE Internal Use Only Only for training and service purposes...
  • Page 36 CHECK PC. PC is going to the Check the Signal DPM mode input CHECK Signal cable Check Signal connection cable DET pin Trouble in IC200 Copyright © 2010 LG Electronics. Inc. All right reserved. -36 - LGE Internal Use Only Only for training and service purposes...

  • Page 37: Exploded View

    X-RADIATION, Shock, Fire, or other Hazards. Do not modify the original design without permission of manufacturer. Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 38 PORT NO.:HDMI1 Headphone AMP (HDMI2.0) JK100 51V019S-35SN-CR2-B-LG IC100 TPA6138A2 DATA2+ +INR +INL DATA2_SHIELD AR100 C121 C320 C323 R141 R148 180pF C341 180pF DATA2- R135 R153 HDMI1_RX2+ -INR -INL HDMI1_RX2- HP_ROUT_MAIN HP_LOUT_MAIN DATA1+ C325 C330 HDMI1_RX1+ R151 R140 10pF DATA1_SHIELD OUTR...
  • Page 39 EDP_WAFER +5V_STANDBY P201 MODULE-eDP Joystick Key IIC for Debugging 05030HR-H30C1(G) (from MP, delete this parts) DE_BUG P202 12507WS-04L +3.3V_NORMAL +3.3V_NORMAL L202 DE_BUG P200 BLM15PX121SN1 AR207 RED LED OPT 12507WR-08L JP202 DE_BUG C200 AR200 JP201 +3.3V_NORMAL R213 R214 3.3K 3.3K EDP3- R216 JP204 EDP3+...
  • Page 40 MAIN IC POWER LINE - CAPACITOR +3.3V_NORMAL +1.8V_DDR VDD_DRAM_A AVDD_PLL +1.15V_VDD_DDR_A L111 +1.15V_VDD close to Q1 L116 close to Q1 BLM18PG121SN1D BLM18PG121SN1D L100 close to Q1 C175 C181 C187 BLM18PG121SN1D C191 C196 C213 C255 10uF 10uF 0.1uF 0.1uF 0.1uF C233 C241 ->...
  • Page 41 SCALAR DC-DC BLOCK DC-JacK (Straight Type) JK400 +19V KJA-DC-1-0032 JP400 C409 C410 0.1uF 68uF For Jig Test JP401 +5V_STANDBY +5V_STANDBY +19V R402 100K +3.3V_NORMAL R416 R409 PD_CTLZ_1.8V IC400 L400 L401 +1.8V_DDR MP2315GJ C421 C411 0.1uF +5V_STANDBY 0.1uF IC404 R400 MP2315GJ R407 L404 Setting: 3.37V=0.8(1+18K/5.6K)

This manual is also suitable for:

Flatron 27ud68