LG 27BL85U, Service Manual

Page 1: ...nternal Use Only CHASSIS MODEL CAUTION BEFORE SERVICING THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL SERVICE MANUAL LED MONITOR SERVICE MANUAL LM8BA 27UL850 27BL85U P NO MFL69413817 1811 REV00 ...

Page 2: ...nics Inc All rights reserved Only for training and service purposes CONTENTS 2 SAFETY PRECAUTIONS 3 SPECIFICATION 4 Firmware Upgrade Method 8 TROUBLE SHOOTING GUIDE 19 BLOCK DIAGRAM 14 EXPLODED VIEW 15 DISASSEMBLY 16 CONTENTS ...

Page 3: ... of electrical shock Leakage Current Cold Check Antenna Cold Check With the instrument AC plug removed from AC source connect an electrical jumper across the two AC plug prongs Place the AC switch in the on position connect one lead of ohm meter to the AC plug prongs tied together and touch other ohm meter lead in turn to each exposed metallic parts such as antenna terminals phone jacks etc If the...

Page 4: ...P OUT Audio L R Checked RS 232C N A Checked 8 Power Cord Length 1 55 0 05m 1 55m Refer to Suffix standard and power cord Table Weight 0 174kg 10 0 173kg Color White Checked 9 Cable Phone to RS 232 Length 0 2 0 01m N A Do not provide Weight 0 02kg 10 N A Color Black N A USB C To C Cable Length 1 8 0 03m 1 80m P N EAD63932602 Refer to BOM Weight 0 0775kg 5 0 077kg Color White Checked Impedance 1 CAB...

Page 5: ... 1152 x 864 Checked V Lines 60 05 905 864 1 3 37 5 H Pixels 74 250 45 00 1650 1280 110 40 220 1280 x 720 Checked V Lines 60 00 750 720 5 5 20 6 H Pixels 83 5 49 702 1680 1280 72 128 200 1280 x 800 Checked V Lines 59 810 831 800 3 6 22 7 H Pixels 108 63 981 1688 1280 48 112 248 1280 x 1024 Checked V Lines 60 02 1066 1024 1 3 38 8 H Pixels 108 00 60 00 1800 1600 24 80 96 1600 x 900 Checked V Lines 6...

Page 6: ... 60 00 750 720 5 5 20 6 H Pixels 83 5 49 702 1680 1280 72 128 200 1280 x 800 Checked V Lines 59 810 831 800 3 6 22 7 H Pixels 108 63 981 1688 1280 48 112 248 1280 x 1024 Checked V Lines 60 02 1066 1024 1 3 38 8 H Pixels 108 00 60 00 1800 1600 24 80 96 1600 x 900 Checked V Lines 60 00 1000 900 1 3 96 9 H Pixels 148 5 67 5 2200 1920 88 44 148 1920 x 1080 Checked V Lines 60 1125 1080 4 5 36 10 H Pixe...

Page 7: ... 7 Copyright LG Electronics Inc All rights reserved Only for training and service purposes BLOCK DIAGRAM ...

Page 8: ...fety 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 Do not modify the original design without permission of manufacturer IMPORTANT SAFETY NOTICE Only for training and service purposes ...

Page 9: ...tronics Inc All rights reserved Only for training and service purposes Assembly Disassembly Disassembly method 1 1 Tool 2 Pull the button downward and disassembly the stand 3 Remove screw 4ea 1 Put the set on a soft cloth ...

Page 10: ...G Electronics Inc All rights reserved Only for training and service purposes 5 Disassembly the FFC Lamp control D and hera 6 Remove screw 3eaandChassis assy 4 Open the Back cover with jig first point is middle of top ...

Page 11: ... 11 Copyright LG Electronics Inc All rights reserved Only for training and service purposes 9 LCD Module 7 Reversed Head assyand Disassembly deco 8 Reversed Head assyand Remove screw 9ea ...

Page 12: ... Use Only 1 NO POWER N Check Power connector OK Replace Adapter Y N Y Y N Replace IC601 Recheck N Y Replace IC202 Flash Memory Y Check JP400 JP401 Voltage Level 19V Check IC601 Output Voltage Level 3 3V Check IC405 IC403 IC404Output Voltage Level 5V 1 8V 1 15V Replace IC405 IC403 IC404 Recheck Check X200 Clock 12MHz Replace X200 ...

Page 13: ...rposes LGE Internal Use Only 2 NO SCREEN ON Replace Cable N Module Back Light On Y N N Replace IC402 Recheck Y N Replace T Con Board or Module Y Check IC 601 Replace Main Scaler IC Check Panel Power 10V JP209 Check WLED_ENABLE High IC601 Pin 27 Check e DP Cable for Damage or Open Conductors ...

Page 14: ...l Use Only 3 No Video HDMI Check signal format and resolution Is it supported Check JK100 or JK101 for proper connection or Damage Replace Connector Y N Check HDMI 5V from Source PC JK100 and JK101 Pin No 18 Re Download EDID Data Y N Y Check HDMI Cable for Damage or Open Connector Y Replace Main Scaler IC200 ...

Page 15: ...nd service purposes LGE Internal Use Only 4 No Video DP Replace Main Scaler IC200 Check signal format and resolution Is it supported Check JK801 for proper connection or Damage Replace Connector Y N Check AUX Signal R137 or R142 Y Y Check DP Cable for Damage or Open Connector Y ...

Page 16: ...service purposes LGE Internal Use Only 4 No USB C Replace Main Scaler IC200 Check input signal format Is it supported Check JK801 for proper connection or Damage Replace Connector Y N Check AUX Signal R876 or R890 Y Y Y Check USB CCable for Damage or Open Connector N ReplaceIC801 ...

Page 17: ...aining and service purposes LGE Internal Use Only 5 No Sound H P Replace Main Scaler IC200 Check the Input source Check the sound setting in PC Setting like a right image Y N Check JK501 Soldering Do re soldering Y N Y Check Cable status for Damaged or Open Connector Y ...

Page 18: ...raining and service purposes LGE Internal Use Only 6 No Sound Speaker Check the Input source Check Speaker Cable is connected Connect the Cable correctly Y N Replace Speaker and Check the status Replace Main Scaler IC200 N Y Check Cable for Damaged or Open Connector Y ...

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