LG 27BK4 Series Service Manual
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LG 27BK4 Series Service Manual

Chassis lm 8aa
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LED MONITOR
SERVICE MANUAL
SERVICE MANUAL
CHASSIS : LM 8AA
MODEL :27BK4 SERIES
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL69406845(1806-REV01)
Internal Use Only
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Summary of Contents for LG 27BK4 Series

  • Page 1 Internal Use Only LED MONITOR SERVICE MANUAL SERVICE MANUAL CHASSIS : LM 8AA MODEL :27BK4 SERIES CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO : MFL69406845(1806-REV01)

  • Page 2: Safety Precautions

    SAFETY PRECAUTIONS 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 3: Specification

    SPECIFICATION Item Content Measurement Result Remark Checked Customer BRAND 20MK400/22MK430(22BK430)/24MK430( Checked 24BK430)/27MK400(27BK400) User Model Name 22MK400(22BK400)/24MK400 24BK400) /27MK430 Checked Sale region Worldwide 20MK400 19.5” Wide LCD MNT Checked 22MK430( Checked 22BK430) 21.5” Wide LCD MNT 22MK400( 22BK400) 24MK430( Checked Feature 24BK430) 23.8”...
  • Page 4 Checked External SW & Adj. 5-way joystick switch General OSD,DDC2B,DDC2AB, HDCP, Control Checked Scope Lock, Wide/Original, Smart Energy Function Saving, Color Weakness, Black level, Reader mode, Flicker safe Length 1.5m±0.05m Shape Checked Detachable Type / Color : Black / Weight : SET accessory 0.091kg±...
  • Page 5 Color: Black, Weight : 154g ±10%, without vinyl bag Output: DC 19V 0.84A, 16W Adapter Color: Black, Weight : 126g ± 10%, without vinyl bag 20MK400/22MK400H 22BK400) Output: DC 19V 0.84A, 16W Adapter Color: Black, Weight : 126g ±10%, without vinyl bag 20MK430H***VMVN Checked 20MK400A***...
  • Page 6 BOE cDMS EAT63400002 / MV215FHB-N30 Cell: EAJ63869201 *S*EAJ6386920 2 / MV215FHB-N30 22MK430(22BK430)H***EJVN BOE cDMS EAT63400003/ MV215FHB-N31 Cell: EAJ64410301 MV215FHB-N31 BLU : EBV60978086 22MK430(22BK430)H***KMVN LGD Normal EAJ63849701 LM215WF3-SLS1 22MK400H(22BK400)***FJVN BOE BMS EAT63474602 / LGM215AB02 Cell : EAJ63989701 HM215WU3-501 BLU : EBV60978050 24MK430(24BK430)H***MJVN LGD cDMS...
  • Page 7 EAT62633902 / LGM238LC4-SLA4 Cell:EAJ63109401 /LM238WF1SJK1 BLU : EBV61158019 24MK430(24BK430)H***KMVN LGD Normal EAJ63909101 LM238WF1-SLK1 24MK400H(24BK400H)***PJVN BOE BMS EAT63415901 / LGM236AB12 Cell : EAJ62549701 HM236WU3-101 BLU : EBV60978047 27MK400(27BK400)H***VMVN AUO FHD TN SNB EAJ64447601 / M270HTN025 27MK430H***FEVN BOE BMS EAT62953221 / LGM270BC4 Cell : EAJ64670501 MV270FHB-N20 BLU : EBV61138218...
  • Page 8 27BK430H***DNVN BOE Module EAJ63948301 MV270FHM-N20 24MK430H*DJVN BOE cDMS EAT62953226/ LGM238BC4 Cell : EAJ64771101 *S*EAJ6477110 2 MV238FHB-N30 BLU : EBV61158027...
  • Page 9 2. Signal Timing (Resolution) 2.1. Signal (Video & Sync) Video Sync 1) Main Recommended Timing Frequency Total Display Front Sync. Back Measurement Result Mode section polarity CLOCK[ Resolution [kHz]/[Hz] Period(E) Porch(D) Porch(B) MHz] H(Pixels) 31.468 Checked 28.321 720 X 400 V(Lines) 70.08 Checked...
  • Page 10 H(Pixels) 63.981 1688 1280 Checked 108.0 1280 x 1024 V(Lines) 60.023 1066 1024 Checked H(Pixels) 79.976 1688 1280 Checked 135.0 1280 x 1024 V(Lines) 75.035 1066 1024 Checked H(Pixels) 65.290 2240 1680 Checked 146.25 1680 x 1050 V(Lines) 59.954 1089 1050 Checked H(Pixels)
  • Page 11 H(Pixels) 37.879 1056 Checked 40.0 800 x 600 V(Lines) 60.317 Checked H(Pixels) 46.875 1056 Checked 49.5 800 x 600 V(Lines) 75.0 Checked H(Pixels) 48.363 1344 1024 Checked 65.0 1024 x 768 V(Lines) 60.0 Checked H(Pixels) 60.023 1312 1024 Checked 78.75 1024 x 768 V(Lines) 75.029...
  • Page 12 H(Pixels) 83.99 2080 1920 Checked 174.5 1920 x 1080 V(Lines) 74.97 1119 1080 Checked 6.1.2 HDMI Video input Factory support Horizontal Vertical mode frequency frequency HDMI (Preset Mode) (KHz) (Hz) 480P 31.5 576P 31.25 720P 37.5 720P 1080P 56.25 1080P 67.5 (Recommend Mode)
  • Page 13 1. Monitor JIGs  LG Monitor JIG(P/N RAD33028001)  Novatek JIG(P/N RAD32227901) 1. How to connect  1.1 Connect the PC USB cable and HDMI (or D-sub) Cable as like below picture  Monitor ...
  • Page 14  1.2 USB cable is connected with PC(or Desktop PC) HDMI(or D-Sub) cable is connected on Monitor. ** If there is only DVI port on Monitor, you can use HDMI to DVI cable instead of HDMI cable Connect to Monitor ...
  • Page 15 2.1 execute EasyWriter Tool and then select [Setup ISP Tool ] on [Option]  2.2 change the setting as like below image and then click [Confirm Change] button Select ISP Jig type depends on board   LG Monitor JIG(P/N RAD33028001) Novatek (P/N RAD32227901) Monitor Monitor  ...
  • Page 16  2.3 After start EasyWriter Tool, like below image, on [Option] tab, lick the [WP Pin Select]  2.4 Check the WP pin slection.For the rest, it must be unchecked. And then click the [save].
  • Page 17  2.6 After start EasyWriter Tool, like below image, on [Option] tab,  2.5 Setting of the FE2P Block Select check [FE2P Mode Enable] Check the bank0, bank1, bank2, bank3 • Caution : If not checked FE2P Mode Enable, EDID and HDCP key will be deleted. ...
  • Page 18  2.8 click [ Auto] icon for download new File on Monitor.  2.9 check the [ end ] message, that means completed download.
  • Page 19 BLOCK DIAGRAM Panel(1920x1080) MP2331 DC/DC LVDS 3.3V FLASH 1.2V TJ5631 SCALER NT68771V Key1 & Key2 Control Key Headphone HDMI...

  • Page 20: Exploded View

    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 21 ■ Disassemble method Fig.2 use a coin to release the screw and disassemble the base . Fig.1 Place the monitor’s screen face down on a soft plane. Fig 4 use screw driver to release 1 EA screw Fig.3 use screw driver to release the 2 screw and disassemble the Stand body.
  • Page 22 ■ Disassemble method 27BK400H 27BK430H Fig 6 detach the tapes, latches and lines. Fig 5 detach the latches of 3 edges to disassemble the back cover Fig 7 Disassemble the module and cabinet.

  • Page 23: Troubleshooting Guide

    TROUBLESHOOTING GUIDE 1. NO POWER...
  • Page 24 2. NO SCREEN ON...
  • Page 25 3. No Video...

This manual is also suitable for:

27bk400 series27bk430h-b