LG 27UL550 Service Manual
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LG 27UL550 Service Manual

Led lcd monitor, chassis lm8ca
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LED LCD MONITOR
SERVICE MANUAL
CHASSIS :
MODEL :
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO :
(1906-REV01)
MFL62449373
LM8CA
27UL550
27BL55U
Internal Use Only

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Summary of Contents for LG 27UL550

  • Page 1 Internal Use Only LED LCD MONITOR SERVICE MANUAL CHASSIS : LM8CA MODEL : 27UL550 27BL55U CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO : (1906-REV01) MFL62449373...
  • Page 2 BLOCK DIAGRAM ..............................- 26 - EXPLODED VIEW ..............................- 27 - ASSEMBLE AND DISASSEMBLE ..........................- 28 - TROUBLE SHOOTING GUIDE ............................ - 30 - - 2 - Copyright © 2019 LG Electronics Inc. All rights reserved. Only training and service purposes...
  • Page 3 1 MΩ and 5.2 MΩ. *Base on Adjustment standard When the exposed metal has no return path to the chassis the reading must be infinite. - 3 - Copyright © 2019 LG Electronics Inc. All rights reserved. Only training and service purposes...
  • Page 4 Do not provide Cable 1) CABLE : 90 Ω±15Ω Impedance 2) CONNECTOR : 90 Ω±10Ω Length 1.50m±0.05m 1.5m DisplayPort EAD63749403 Weight 0.136kg ± 10% 0.135kg - 4 - Copyright © 2019 LG Electronics Inc. All rights reserved. Only training and service purposes...
  • Page 5 Input : DC 19V / 2.0 A Checked regulation team Not applied 12 Accessory Box P/No Specification 27” Checked 13 Applying module list MODULE (BOE) EAJ65029401 MV270QUM-N30 - 5 - Copyright © 2019 LG Electronics Inc. All rights reserved. Only training and service purposes...
  • Page 6 1481 1440 H(Pixels) 66.66 4000 3840 266.64 3840 x 2160 V(Lines) 2222 2160 H(Pixels) 133.32 4000 3840 3840 x 2160 V(Lines) 2222 2160 - 6 - Copyright © 2019 LG Electronics Inc. All rights reserved. Only training and service purposes...
  • Page 7 (Hz) 480P 31.5 720P 1080P 67.5 2160P Supporting timing ● Estabilisied I, Estabilisied II, Manufacturer Timing ● Standard Timing ● Detailed Timing (1Page) - 7 - Copyright © 2019 LG Electronics Inc. All rights reserved. Only training and service purposes...
  • Page 8 59.94/60 16:9 ● HDMI1.4 : HDMI1/2 : HDMI ULTRA Deep Color : OFF HDMI2.0 : HDMI1/2 : HDMI ULTRA Deep Color : ON - 8 - Copyright © 2019 LG Electronics Inc. All rights reserved. Only training and service purposes...
  • Page 9 1page 내 0x14h = [B5] HDMI1.4 : HDMI1/2 : HDMI ULTRA Deep Color : OFF HDMI2.0 : HDMI1/2 : HDMI ULTRA Deep Color : ON - 9 - Copyright © 2019 LG Electronics Inc. All rights reserved. Only training and service purposes...
  • Page 10 Refer to variable data file Checked (Variable data) Model Name LG HDR 4K Checked Check Sum Refer to variable data file Checked (Variable data) - 10 - Copyright © 2019 LG Electronics Inc. All rights reserved. Only training and service purposes...
  • Page 11 2.1.1.1 HDMI1 EDID (HDMI1.4) : HDMI ULTRA HD Deep Color : OFF 2.1.1.2 HDMI2 EDID (HDMI1.4) : HDMI ULTRA HD Deep Color : OFF - 11 - Copyright © 2019 LG Electronics Inc. All rights reserved. Only training and service purposes...
  • Page 12 2.1.1.3 HDMI1 EDID (HDMI2.0) : HDMI ULTRA HD Deep Color : ON 2.1.1.4 HDMI2 EDID (HDMI2.0) : HDMI ULTRA HD Deep Color : ON - 12 - Copyright © 2019 LG Electronics Inc. All rights reserved. Only training and service purposes...
  • Page 13 2.1.1.5 .HDMI1 EDID of FREE-SYNC ON Basic mode 2.1.1.6 .HDMI1 EDID of FREE-SYNC ON Extended mode - 13 - Copyright © 2019 LG Electronics Inc. All rights reserved. Only training and service purposes...
  • Page 14 2.1.1.7 .HDMI2 EDID of FREE-SYNC ON Basic mode 2.1.1.8 .HDMI2 EDID of FREE-SYNC ON Extended mode - 14 - Copyright © 2019 LG Electronics Inc. All rights reserved. Only training and service purposes...
  • Page 15 2.1.1.9 . DP EDID (DP1.4) 2.1.1.10 . DP EDID (DP1.2 / DP1.1) - 15 - Copyright © 2019 LG Electronics Inc. All rights reserved. Only training and service purposes...
  • Page 16 2.1.1.11 . DP EDID of FREE-SYNC ON Basic mode 2.1.1.12 . DP EDID of FREE-SYNC ON Extended mode - 16 - Copyright © 2019 LG Electronics Inc. All rights reserved. Only training and service purposes...
  • Page 17 ADJUSTMENT INSTRUCTION 1. Application  1.1  This  document  is  applied  to  LM8CA  chassis  27BL55U/27UL550  &  27UL500  LCD  Monitor  which  is  manufactured  in  Monitor  Factory  or  is  produced on the basis of this data.  1.2 Manufacturing Type: SET    2. Designation      2.1 The adjustment is according to the order which is designated and which must be followed, according to the plan which can be  changed only on agreeing.  2.2. Power Adjustment: Free Voltage  2.3. Magnetic Field Condition: Nil.  2.4. Input signal Unit: Product Specification Standard  2.5. Reserve after operation: Above 5 Minutes (Heat Run)    Temperature : at 25℃±5°C / Relative humidity: 65 ±10% / Input voltage: 100 ~ 240V, 50/60Hz  2.6. Adjustment equipments: Color Analyzer (CA‐210 or CA‐110), DDC Adjustment Jig equipment,   ...
  • Page 18                                             0x04      ‐      Set 4H    4.4 Factory calibration  Factory Calibration(2.2) : Gamma, dE, Color Temperature(6500k)  ‐ Reference Model: 27MU67/27UD68/27UD88/27UD58/27UD88/32UD89/27UK850/27UK650/27UK600  ‐ Input: HDMI1/2 , Gray Pattern with Gamma correction using command using “Adjustment Command”  ‐ This model must be calibrated Gamma2.2  Gamma calibration and verify    ※ when doing Adjustment, Please make circumstance as below.  - 18 - Copyright © 2019 LG Electronics Inc. All rights reserved. Only training and service purposes...
  • Page 19 ‐. Check Point : HDR OSD but this OSD disapper in few seconds                                    4.7 DPM Operation check  ■ Measurement Condition: 100~240V@ 50/60Hz     1) Set Input to DisplayPort, HDMI1, HDMI2 - 19 - Copyright © 2019 LG Electronics Inc. All rights reserved. Only training and service purposes...
  • Page 20 Color Temp Custom Color Adjust Green Blue Six Color (Hue/Saturation) Picture Reset Language Depend on the sale region General Smart Energy Saving Power LED - 20 - Copyright © 2019 LG Electronics Inc. All rights reserved. Only training and service purposes...
  • Page 21 Automatic Standby Off(EU/EK/PD/EW/MA,4H) DisplayPort Version HDMI ULTRA HD Deep Color Buzzer OSD Lock OSD Size Small Information Reset to Initial Settings       - 21 - Copyright © 2019 LG Electronics Inc. All rights reserved. Only training and service purposes...
  • Page 22 FF:ON / 00:OFF 0x90 0x90 : HDMI1 0x91 0x91 : HDMI2 Input Select 0xD0 0xD0 : DP 0xD1 0xD1 : Type-C SYSTEM RESET Restart System - 22 - Copyright © 2019 LG Electronics Inc. All rights reserved. Only training and service purposes...
  • Page 23 Read C/s of Serial data data Read checksum data of 24 byte 0x00 : OFF HDR Max Bright 0x01 : ON       - 23 - Copyright © 2019 LG Electronics Inc. All rights reserved. Only training and service purposes...
  • Page 24   4‐Page    80~FF    Read 11      5‐Page      0~7F    Read 12      5‐Page    80~FF    Read - 24 - Copyright © 2019 LG Electronics Inc. All rights reserved. Only training and service purposes...
  • Page 25         L : 0x00,0x10,….0x70    6.6.5 EDID Read  DDC2B Command.(A0/A1)    START A0 START A1 Data1 . . . Data128 A STOP         ‐ 128 Byte transfer of EDID Buffer of    MICOM  - 25 - Copyright © 2019 LG Electronics Inc. All rights reserved. Only training and service purposes...
  • Page 26 BLOCK DIAGRAM - 26 - Copyright © 2019 LG Electronics Inc. All rights reserved. Only training and service purposes...
  • Page 27 EXPLODED VIEW IMPORTANT SAFETY NOTICE Many electrical and mechanical 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 Shock, Fire, or other Hazards.
  • Page 28 Caution: SVC man must check insulation sheet on the module before assembling the set Disassemble Stand base and Body by Disassemble body Thumb screw - 28 - Copyright © 2019 LG Electronics Inc. All rights reserved. Only training and service purposes...
  • Page 29 Disassemble screws 4EA with B/C Cable Cable Disassemble screw 3EA cover with screen Disassemble the C/A cover - 29 - Copyright © 2019 LG Electronics Inc. All rights reserved. Only training and service purposes...
  • Page 30 Check Panel Power Replace IC402 & 10V(JP209) Recheck Check e-DP Cable for Damage or Open Replace Cable Conductors Replace T-Con Board or Module - 30 - Copyright © 2019 LG Electronics Inc. All rights reserved. Only training and service purposes...
  • Page 31 No video – HDMI - 31 - Copyright © 2019 LG Electronics Inc. All rights reserved. Only training and service purposes...
  • Page 32 No video – DP - 32 - Copyright © 2019 LG Electronics Inc. All rights reserved. Only training and service purposes...
  • Page 33 No Sound (H/P) - 33 - Copyright © 2019 LG Electronics Inc. All rights reserved. Only training and service purposes...

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