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LG 34WL550 Service Manual
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LG 34WL550 Service Manual

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LED MONITOR
SERVICE MANUAL
SERVICE MANUAL
CHASSIS :
MODEL :
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO :
P/NO : MFL70211523 (1909-REV00)
Any reproduction, duplication, distribution (including by way of email, facsimile or other electronic means),
publication, modification, copying or transmission of this Service Manual is STRICTLY PROHIBITED unless you
have obtained the prior written consent of the LG Electronics entity from which you received this Service Manual.
The material covered by this prohibition includes, without limitation, any text, graphics or logos in this Service
Manual.
Copyright © 2019 LG Electronics Inc. All rights reserved. Only training and service purposes.
LM83B
34WL550
CONFIDENTIAL
34WL550-BJ

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Summary of Contents for LG 34WL550

  • Page 1 Service Manual is STRICTLY PROHIBITED unless you have obtained the prior written consent of the LG Electronics entity from which you received this Service Manual. The material covered by this prohibition includes, without limitation, any text, graphics or logos in this Service Manual.

  • Page 2: Table Of Contents

    SAFETY PRECAUTIONS ................ 3 SPECIFICATION ..................4 ADJUSTMENT INSTRUCTION ..............6 BLOCK DIAGRAM ................... 7 EXPLODED VIEW ..................8 DISASSEMBLY ..................9 TROUBLE SHOOTING GUIDE .............. 11 - 2 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 3: Safety Precautions

    When the exposed metal has no return path to the chassis the reading must be infinite. An other abnormality exists that must be corrected before the receiver is returned to the customer. - 3 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 4: Specification

    Input: AC100~240V 50~60Hz 1.1A Power Output: DC 19V 2.1A,40W Adapter EAY62850015 (Adapter) Color : Black, Weight : 0.439kg±10% Applying module list Specification EAJ65493201 SEM340F0(BD0- M04)_EPS - 4 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 5 66.636 2720 2560  181.25 V(Lines) 59.98 1111 1080 2560 x 1080 H(Pixels) 83.915 2720 2560 228.25 2560 x 1080 V(Lines) 74.99 1119 1080 - 5 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 6: Block Diagram

    BLOCK DIAGRAM - 6 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 7: 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. Do not modify the original design without permission of manufacturer. Copyright 2017 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 8 Disassemble method Place the monitor’s screen face down on a soft cloth. Fig.1 Fig.2 Disassemble the Stand body with pulling down the button. Copyright 2017 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 9 Fig 3 Remove the Screw(4EA) and disassemble the back cover Fig 4 Disassemble the back cover (Latch Type) . Fig 5 Remove the Speaker (2EA)、Tape(2EA). Copyright 2017 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 10 Disassemble method Fig.6 Disassemble the FFC cable (2EA), cable(2EA). Fig.7 Disassemble the Screw (2EA). Copyright 2017 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 11 Disassemble method Fig.7 Disassemble the Metal frame assy . Fig.8 Disassemble the cabinet . Copyright 2017 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 12 Disassemble method Fig.9 Disassemble the main PCB and joy stick cover . Copyright 2017 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...

  • Page 13: Trouble Shooting Guide

    Check IC705 Output Replace IC705 & Voltage Level (2.5V, 1.2V) Recheck Check X100 Clock Replace X100 27MHz Replace IC107 Flash Memory - 13 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 14 P300 (#9, 10, 36, 37) Check FFC Cable for Damage or Replace FFCable Open Conductors Replace T-Con Board or Module - 14 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 15 Check IC102 AUX Signal Replace the IC102 (#J1,H1) Check IC103 AUX Signal Replace the IC103 (#3,4) Replace the G-SYNC Module - 15 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 16                                                                                                                                                                         34WK650  29WK600  34BL650  34WL500  29WL500  34WL50S  29WL50S  34WL60TM  34WL600  34WL550      Home Entertainment Company  Monitor/PC BD / Monitor Dev. Lab.  LG electronics...
  • Page 17 Add  34WL50S  skyworth  panel  information    18  19.05.27  Wang  Xueqian  Change  RGB  gain  range  to  0‐32    Add  34WK650*SN  skyworth,34WL60TM,34WL600,3 19  19.07.15  Ming  Lei    4WL550  module  information  20  19.08.01  Ming  Lei  Add  34BL650  skyworth  module  information    LG electronics...
  • Page 18 LG ELECTRONICS INC. / MONITOR DIVISION  Establish : 2017/7/12  LM80B ADJUSTMENT SPECIFICATION  3/11    Revision : 0    Note) Refer to ECO about detail of revision history.      LG electronics...
  • Page 19 LG ELECTRONICS INC. / MONITOR DIVISION  Establish : 2017/7/12  LM80B ADJUSTMENT SPECIFICATION  4/11    Revision : 0    CONTENTS              1.  Application    2.  Designation    3.  Main PCB check process  4.  Total Assembly line process  5.  Shipping condition    6.  Signal composition for adjustment  LG electronics...
  • Page 20 2.6. Adjustment equipments: Color Analyzer (CA‐210 or CA‐110), DDC Adjustment Jig equipment,      3. Main PCB check process (SMT)  After Manual‐Insult, executing APC    * APC ‐    3.1 ADC Process    ‐ 34WK650/29WK600 doesn’t need ADC process because it has only digital input like DisplayPort, HDMI.    3.2 Main PCB Function test  HDCP2.2 write command 확     ‐ Check display/audio according to interface  인     3.3‐1 Write HDCP 2.2 Key  a. Write HDCP Key into Flash memory by using DDC2AB protocol & HDCP Adjustment Jig equipment.    HDCP 2.2 Write Command :    F9    AddressHigh    AddressLow    ex) F9 00 00    * There must be input signal. No input signal causes the HDCP Key write fail.    LG electronics...
  • Page 21                                             0x04      ‐      Set 4H                                      LG electronics...
  • Page 22 Adjust to meet x/y color coordinate as below. 2~4 min 4~8min 8~10min 10~25min 25~40min 40min~ 0.316 0.315 0.314 0.313 0.313 0.313 0.334 0.333 0.331 0.329 0.329 0.329 Save Warm(6500K) Color by commanding COLOR SAVE Command code. ※ when doing Adjustment, Please make circumstance as below.    LG electronics...
  • Page 23 2) and push the “ ” or “ ”. 3) In Service Menu. 4.4 .2 White balance adjustment (29/34WL500, 29/34WL50S,34WL60TM,34WL600,34WL550) Adjust PRESET Warm(6500K) Color coordinates. Set the CA-210 for calibration. Set the internal White Pattern by commanding WHITEBALANCE_START Command code.
  • Page 24 3) In Service Menu. ※ When doing Adjustment, Please make circumstance as below. 4.5 Check HDR (추가  확인  필요)  ‐. Before the factory calibration, check the White balance according to below specification.    1) HDR Mode check (HDMI)  ‐. Equipment : MSPG‐7800  ‐. Check Point : HDR OSD but this OSD disapper in 1second                                      LG electronics...
  • Page 25 5. Shipping condition        Make sure to do FACTORY RESET at the final process Item Content& Outgoing Condition 비고 Refer to BOM / And General Full accessory list is included Accessory specification(3page) in general specification Brightness Contrast Outgoing Quick Conditio Volume Settings Color Temp Custom Maxx Audio LG electronics...
  • Page 26 Picture Reset Volume Sound Maxx Audio Language Depend on the sale region Smart Energy Saving Power LED Automatic Standby Off(EU/EK/PD/EW/MA,4H) HDMI Compatibility General Mode DisplayPort1.2 Enable Buzzer OSD Lock Information Depending on a model Reset       LG electronics...
  • Page 27 Tune Analog Bright FACTORY RESET Factory reset AUTO COLOR Tuning AUTO_COLOR_ADJUST 0:Auto color 6500K COLOR_MODE_CHANGE 9300K Elapsed time Clear Aging off &Clear elapsed time Aging On/Off FF/00 FF:ON / 00:OFF 0x90 0x90 : HDMI1 Input Select 0x91 0x91 : HDMI2 LG electronics...
  • Page 28 0x00:OFF 0xF7 0x00~0x01 APD command 0x01: set APD time to 4h OFF:00 0XEE APD check addrss & vaule ON:04 LM340WW1-SSC1 (0X03)(34WK650*SN) 0X51 (0X03)(34BL650*SN) (0X03)(34WL500*SN) (0X03)(34WL50S*SN) Module selection LM290WW2-SSC1 (Page: 0XA8, 0X00) (0X02)(29WL500*SN) 0X53 (0X02)(29WL50S*SN) LM290WW2-SSD1 (0X02)(29WK600*SN) SEM340F0-LD0-M01 0x54 LG electronics...
  • Page 29 LG ELECTRONICS INC. / MONITOR DIVISION  Establish : 2017/7/12  LM80B ADJUSTMENT SPECIFICATION  14/11    Revision : 0  (34WL500*JNSN) (34WL50S*JNSN) (34WK650*JNSN) (34WL60TM-BK.AUSJMSN) (34WL600-BK.AUSJMSN) (34WL550-BJ.AUSJMSN) SEM340F0-BD0-M01 (34WL500*ENSN) (34WL50S*ENSN) 0x55 (34WK650*ENSN) SEM340F0-BD0-M04 (34BL650*ENSN) HDCP 2.2 write Write HDCP 2.2 key HDCP 2.2 read data Read HDCP 2.2 key Send 24 byte(EDID SN(4byte) + Send Serial data...
  • Page 30 80  5‐Page    80~FF    Read  13      AC  0  6‐Page      0~7F    Read  14        80  6‐Page    80~FF    Read  15      AE  0  7‐Page      0~7F    Read  LG electronics...
  • Page 31         D :    data  8‐byte write    START Data1 …. Data8 STOP             L : 0x00,0x10,….0x70    6.6.5 EDID Read  DDC2B Command.(A0/A1)  START START Data1 . . . Data128   STOP         ‐ 128 Byte transfer of EDID Buffer of    MICOM    LG electronics...
  • Page 32 20150901 PORT NO.:HDMI1 for 1.6T(NT) (HDMI1.4) Request from component development team HDMI1_for 1.6T(NT) before : EAG61491201 JK100 JK101 after : EAG59023302 (HDMI2.0) HDM2LB-19BG2RN3G HDM2LB-19BG2RN3G DATA2+ for 1.2T (HQ) DATA2+ HDMI1_for 1.2T(HQ) JK100-*1 JK101-*1 YKF45-7058V YKF45-7058V DATA2_SHIELD AR100 DATA2_SHIELD AR104 DATA2+ DATA2+ DATA2_SHIELD DATA2_SHIELD...
  • Page 33 Control key WHITE_LED BLM18PG121SN1D L200 +5V_STANDBY +3.3V_NORMAL Main Scaler RED_LED P200 BLM18PG121SN1D 12507WR-08L L201 R219 R221 3.3K 3.3K AR204 JP200 KEY1 READY KEY2 R231 JP201 4.7K JP202 R306 HP_INT_OUT_L JP203 HDMI2_SDA HP_INT_OUT_R CRYSTAL R230 R307 HDMI2_SCL 4.7K JP204 Q200 DP0_AUXN CONTROL_LED MMBT3904(NXP) C217...
  • Page 34 MAIN IC POWER LINE - CAPACITOR 1.1V_ON 1.1V_VCCK_ON +3.3V_NORMAL RX_33V 2.5V_DDR_SDRAM_VDD 2.5V_DDR_SDRAM L307 close to Scalar Pin L300 close to Scalar Pin BLM15PX121SN1 L311 BLM15PX121SN1 close to Scalar Pin BLM15PX121SN1 C315 C302 C320 C324 C328 C333 C307 C309 C311 10uF +3.3V_NORMAL 10uF 0.1uF...
  • Page 35 DC-JACK (Straight Type) +19V JK400 JP400 DS439-F01T1BA-A For Jig Test (GND JIG Point) C409 C410 0.1uF 68uF 105C JP401 2.5V, 1.1V(ON) 29inch +19V R485 100K Setting : 2.51V(=0.608(1+75K/24K) Setting: 1.133V=0.8(1+15K/5.6K) Setting : 1.11V(=0.608(1+30K/36K) 29inch +5V_STANDBY R470 +3.3V_NORMAL 1.1V_ON 2.5V_DDR_SDRAM_VDD 100K IC409 IC408 MP2122AGJ...
  • Page 36 LEFT BAR LED DRIVER 34inch LED Driver RIGHT BAR LED DRIVER +19V +19V 34inch 34inch L507 L508 D502 D503 BR210 33uH BR210 33uH 100V 100V High : 1.5V High : 1.5V 34inch 34inch C571 C572 C553 C554 34inch 4.7uF 4.7uF 4.7uF 4.7uF R576...
  • Page 37 +19V_AMP AMP_3.3V AMP_19V Speaker AMP +3.3V_NORMAL +19V +3.3V_AMP R767 R786 L701 5W speaker_Black 10.0uH P700 Q701 250A1-WR-H04M Q704 SSM3J332R KMA3D7P20SA +19V_AMP AUD_LRCK R768 +3.3V_NORMAL +3.3V_NORMAL AUD_SCK C711 SPK_L+ 4.7uF C606 C607 JP705 C729 R773 C706 C710 C733 C735 C737 47pF 22pF 0.22uF 4.7K...

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