LG 27BL55U Service Manual Download Page 29 | Manualshive

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Copyright © 2019 LG Electronics Inc. All rights reserved.

Only training and service purposes

Disassemble screws 4EA with B/C

Cable

Disassemble screw 3EA cover with screen

Cable

Disassemble the C/A cover

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Summary of Contents for 27BL55U

Page 1: ...Internal Use Only P NO CHASSIS MODEL CAUTION BEFORE SERVICING THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL SERVICE MANUAL MFL62449373 1906 REV01 27UL550 27BL55U LM8CA LED LCD MONITOR ...

Page 2: ...cs Inc All rights reserved Only training and service purposes CONTENTS CONTENTS 2 SAFETY PRECAUTIONS 3 SPECIFICATION 4 ADJUSTMENT INSTRUCTION 17 BLOCK DIAGRAM 26 EXPLODED VIEW 27 ASSEMBLE AND DISASSEMBLE 28 TROUBLE SHOOTING GUIDE 30 ...

Page 3: ... sensitivity replace it with the specified Reverse plug the AC cord into the AC outlet and repeat AC voltage measurements for each exposed metallic part Any voltage When replacing a high wattage resistor Oxide Metal Film Resistor measured must not exceed 0 75 volt RMS which is corresponds to over 1 W keep the resistor 10 mm away from PCB 0 5 mA Keep wires away from high voltage or high temperature...

Page 4: ...n Control HDR10 Dual Controller Factory Calibration Checked 7 Input HDMI IN HDMI1 2 0 HDMI2 2 0 HDMI1 1 4 HDMI2 1 4 Checked DP IN Display Port 1 4 Display Port 1 2 Display Port 1 1 Checked Display Port 1 4 Î for HDR function USB C IN N A N A Do not provide USB DN N A N A Do not provide H P OUT Audio L R Checked RS 232C N A N A Do not provide 8 Power Cord Length 1 55 0 05m 1 55m Refer to Suffix sta...

Page 5: ...Ω 10Ω 1 96 69 105 73ohm 2 90 73 108 97ohm 10 Power Adapter PSU LPB Output DC 19V 2 1A 40W Adapter Color White Weight 0 166kg 10 with PE bag Checked P N EAY62850505 Refer to BOM 11 Power Rating Input DC 19V 2 0 A Checked Request to regulation team 12 Accessory Box Not applied 13 Applying module list P No Specification Checked 27 UHD MODULE BOE EAJ65029401 MV270QUM N30 5 Copyright 2019 LG Electronic...

Page 6: ... x 720 V Lines 60 00 750 720 5 5 20 6 H Pixels 83 5 49 702 1680 1280 72 128 200 1280 x 800 V Lines 59 810 831 800 3 6 22 7 H Pixels 108 63 981 1688 1280 48 112 248 1280 x 1024 V Lines 60 02 1066 1024 1 3 38 8 H Pixels 108 00 60 00 1800 1600 24 80 96 1600 x 900 V Lines 60 00 1000 900 1 3 96 9 H Pixels 148 5 67 5 2200 1920 88 44 148 1920 x 1080 V Lines 60 1125 1080 4 5 36 10 H Pixels 277 25 133 32 2...

Page 7: ... 248 1280 x 1024 V Lines 60 02 1066 1024 1 3 38 8 H Pixels 108 00 60 00 1800 1600 24 80 96 1600 x 900 V Lines 60 00 1000 900 1 3 96 9 H Pixels 148 5 67 5 2200 1920 88 44 148 1920 x 1080 V Lines 60 1125 1080 4 5 36 10 H Pixels 277 25 133 29 2080 1920 48 32 160 1920 x 2160 V Lines 60 2222 2160 54 5 3 11 H Pixels 241 50 88 79 2720 2560 48 32 80 2560 x 1440 V Lines 59 95 1481 1440 3 5 33 12 H Pixels 2...

Page 8: ...20 P 59 94 60 16 9 1920 1080 P 23 98 24 16 9 1920 1080 P 29 97 30 16 9 1920 1080 P 50 16 9 1920 1080 P 59 94 60 16 9 3840 2160 P 23 98 24 16 9 3840 2160 P 25 16 9 3840 2160 P 29 97 30 16 9 3840 2160 P 50 16 9 3840 2160 P 59 94 60 16 9 z HDMI1 4 HDMI1 2 HDMI ULTRA Deep Color OFF z HDMI2 0 HDMI1 2 HDMI ULTRA Deep Color ON 8 Copyright 2019 LG Electronics Inc All rights reserved Only training and serv...

Page 9: ...16Bit 20Bit 24Bit AC3 6 32 44 1 48 640kHz Max DTS 6 44 1 48 1536kHz Max DP DP FREE SYNC PCM 2 32 44 1 48 16Bit 20Bit 24Bit AC3 6 32 44 1 48 640kHz Max DTS 6 44 1 48 1536kHz Max EDID 내의 Color Depth Description 입력 Bit 지원유무 Remark HDMI 1 4 2 0 HDMI FREE SYNC 8 10 Extension VSDB 내 6 번째 byte B8 DP DP FREE SYNC 8 1page 내 0x14h A5 10 1page 내 0x14h B5 z HDMI1 4 HDMI1 2 HDMI ULTRA Deep Color OFF z HDMI2 0 ...

Page 10: ...X2160 60Hz z Contrast 70 Brightness Max 100 z 6500K Color Temperature Setting is 6500 K if it s not special specification z Another Spec Product Specification Standard LG 55 G1 1034 z Cosmetic Spec LCD Module IIS Spec 4 EDID 2 1 EDID No Item Content Measurement Result Remark 1 Manufacturer ID GSM1 Checked Hex 1E 6D 2 Product ID HDMI1 2 30470 DP 30471 Checked Hex 77 06 Hex 77 07 3 Year Week Year 19...

Page 11: ...sical Address Separate Port No Checked HDMI1 10 HDMI2 20 11 Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes 2 1 1 Data 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 ...

Page 12: ...2 1 1 3 HDMI1 EDID HDMI2 0 HDMI ULTRA HD Deep Color ON 12 Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes 2 1 1 4 HDMI2 EDID HDMI2 0 HDMI ULTRA HD Deep Color ON ...

Page 13: ...2 1 1 5 HDMI1 EDID of FREE SYNC ON Æ Basic mode 2 1 1 6 HDMI1 EDID of FREE SYNC ON Æ 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 Æ Basic mode 2 1 1 8 HDMI2 EDID of FREE SYNC ON Æ 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 Æ Basic mode 16 Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes 2 1 1 12 DP EDID of FREE SYNC ON Æ Extended mode ...

Page 17: ...ct 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 3 Main PCB check process SMT APC After Manual Insult executing APC 3 1 ADC Process 27UL550 27BL55U 27UL500 doesn t need ADC process because it has only digit...

Page 18: ...ndby time a Set Automatic Standby time by adjustment jig equipment Europe 4H Others OFF Command set F7 00 01 for Europe set 4h F7 00 00 for others set 0ff b Check the Automatic Standby time setting value by adjustment jig equipment Please check the value of 0xA6 0xEE address Value 0x00 OFF 0x04 Set 4H 4 4 Factory calibration a Factory Calibration 2 2 Gamma dE Color Temperature 6500k Reference Mode...

Page 19: ...W B process 1 When in DC Off Condition 2 Press left button 3 times and then right button 1 times press power button 3 Press Menu right side of OSD button and can see Service Menu 4 6 Check HDR 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 few seconds 4 7 DPM Operation ch...

Page 20: ...ication 3page Full accessory list is included in general specification 2 Outgoing Conditio n Quick Settings Brightness 90 Contrast 70 Volume 30 Color Temp Custom Input Input List HDMI1 Input Save ad last condition Aspect Ratio Full wide Picture Picture Mode Custom Picture Adjust Brightness 90 Contrast 70 Sharpness 50 Super Resolution Off Black Level Depending on input signal RGB High YUV Low DFC O...

Page 21: ...s Inc All rights reserved Only training and service purposes Automatic Standby Off EU EK PD EW MA 4H DisplayPort Version 1 4 HDMI ULTRA HD Deep Color On Buzzer On OSD Lock Off OSD Size Small Information OK Reset to Initial Settings No ...

Page 22: ... EEPROM ALL INITIAL E4 00 00 adjustment Initialization EEPROM READ E7 Slave add At EEPROM Read EEPROM WRITE E8 Slave add Data Write data at EEPROM R GAIN 16 00 00 64 Tune Gain G GAIN 18 00 00 64 B GAIN 1A 00 00 64 BRIGHT Backlight 10 00 00 64 Tune Analog Bright FACTORY RESET F0 00 00 Factory reset AUTO_COLOR_ADJUST F1 00 0 AUTO COLOR Tuning 0 Auto color COLOR_MODE_CHANGE F2 00 01 6500K 02 9300K El...

Page 23: ...rainian 0D Chinese 0E Japanese 0F Korean 11 Traditional Chinese EDID SN UPDATE 0x77 0 0x00 Update all input s serial data APD command 0xF7 00 0x00 0x01 0x00 OFF 0x01 set APD time to 4h Module selection F6 0x31 LM270WR3 SSA1 0x36 MV270QUM N20 0x37 MV270QUM N30 default HDCP 2 2 write F9 00 00 Write HDCP 2 2 key HDCP 2 2 read F8 data Read HDCP 2 2 key Send Serial data 75 data Send 24 byte EDID SN 4by...

Page 24: ...odH HPeriodL VtotalH VtotalL SrcHTotalH SrcHTotalL SrcHStartH SrcHStartL SrcVStartH SrcVStartL HsyncPhase Temporary Data write Write to particular address of EEPROM 6 6 E2 PROM Data Read 6 6 1 Signal TABLE 128 Bytes 6 6 2 COMMAND SET No Adjustment contents CMD hex ADH hex ADL hex Explanation 1 EEPROM READ E7 A0 0 0 Page 0 7F Read 2 80 0 Page 80 FF Read 3 A2 0 1 Page 0 7F Read 4 80 1 Page 80 FF Rea...

Page 25: ... EEPROM access by using DDC2B protocol 1 Byte write START A0 A L D STOP A A L 0x00 0x7F D data 8 byte write START A0 A L A Data A A A Data8 STOP L 0x00 0x10 0x70 6 6 5 EDID Read DDC2B Command A0 A1 START A0 A 00 START A1 A Data1 Data128 A CS 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: ...ining and service purposes MST9U35Q 1 SPI UHD Panel 3840 X 2160 HDMI 1 DPRX AUX HPD HDMI 2 TS3DV642 Switch Key1 Key2 DDR2 SDRAM LED Driver IC MP3378E Flash Memory 8MBIT TMDS DDC HPD Joystick Control Key DP EDID EEPROM HP Out L R Out HP AMP WLED_ENABLE WLED_ADIM HDMI 2 0 E DP DP1 4 ...

Page 27: ...y 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 910 900 510 500 200 400 920 540 or 330 300 ...

Page 28: ... Product disassembly Process 2 1 List the basic steps that should typically be followed to remove components and materials requiring selective treatment 2 2 OPTIONAL Depending upon the complexity of the disassembly process a graphic depicting the locations of items contained within the product which require selective treatment with descriptions and arrows identifying locations can be inserted belo...

Page 29: ... 29 Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes Disassemble screws 4EA with B C Cable Disassemble screw 3EA cover with screen Cable Disassemble the C A cover ...

Page 30: ...OK Replace Adapter Y N Y Check IC405 IC403 IC404 Output Voltage Level 5V 1 8V 1 15V Replace IC405 IC403 IC404 Recheck Y N Check X200 Clock 12MHz Check IC601 Output Voltage Level 3 3V Replace IC601 Recheck N Y Replace IC202 Flash Memory Y Replace Cable N Module Back Light On Check IC 601 Replace Main Scaler IC Y N N Check Panel Power 10V JP209 Replace IC402 Recheck Y N Check e DP Cable for Damage o...

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 ...

Page 34: ......

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