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LG UltraFine 24MD4KL, Service Manual, Page: 22 / 24

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LG UltraFine 24MD4KL Service Manual Download Page 22

24MD4KL Disassembly process 

⑦ Disconnect LED / ALS cable and remove sub-board. 

⑧ Remove the rear shield and the FFC cable. 

⑨ Remove the ALS sensor from the top of the module 
       after separating the CA from the module. 

⑩ Removing Screw 15EA, separate Main/Power/ 
   Temperature sensor/Fan 

Copyright 

ⓒ

 2019 LG Electronics Inc. All rights reserved. 

Only training and service purposes.

Summary of Contents for UltraFine 24MD4KL

Page 1: ...NG THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL SERVICE MANUAL Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes CONFIDENTIAL MFL70041056 1901 REV00 LM8KA 24MD4KL 24MD4KL B UltraFine 4K MONITOR ...

Page 2: ...ronics Inc All rights reserved Only training and service purposes CONTENTS 2 SAFETY PRECAUTIONS 3 SPECIFICATION 4 SOFTWARE UPDATE 6 BLOCK DIAGRAM 7 EXPLODED VIEW 8 TROUBLE SHOOTING GUIDE 9 TRAINING MANUAL APPENDIX CONTENTS ...

Page 3: ...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 exposed metall...

Page 4: ... Light Sensor HDCP2 2 7 Input Thunderbolt3 Thunderbolt3 USB C x 2 Dynamic PD 85W 15W PD Power delivery USB USB3 0 2 0 communication USB down USB3 0 Downstream x 3 Audio USB data format Audio ALS Ambient Light Sensor 8 Power Code Length 1 80 0 05 m Weight 0 17 kg 10 Color Black Refer to Suffix standard and power cord table 9 Cable Thunderbolt Length 2 0 0 05 m Weight 0 6 kg 10 Color Black Impedance...

Page 5: ... 2000 1920 8 32 40 1920 x 1080 V Lines 60 1111 1080 1 8 22 3 H Pixels 234 59 88 86 2640 2560 8 32 40 2560 x 1440 V Lines 60 1481 1440 1 8 23 4 H Pixels 401 24 116 64 3440 3360 8 32 40 3360 x 1890 V Lines 60 1944 1890 1 8 45 5 H Pixels 257 66 65 73 3920 3840 8 32 40 3840 x 2160 V Lines 30 2191 2160 1 8 22 6 H Pixels 266 62 65 688 4000 3840 48 32 80 3840 x 2160 V Lines 30 2222 2160 3 5 54 7 H Pixels...

Page 6: ...a CAM Audio NXP and Hub 27MD5KL Support for automatic FW updates through Internet servers Manual FW update support using file open Enables recovery in case of FW update failure 1 2 Setting Automatic installation when boot the Macbook Automatic Updates On Off Factory Reset Help 2 How to FW Update 1 Go to the Monitor Update tab 2 Select FW Image ZIP file for update pop up 3 FW update started in prog...

Page 7: ... IC301 Flash 8Mb Audio Amplifier IC303 Main SoC IC500 LED Driver x 2EA Flash 8Mb Fan 70x70 1500 Thermal Sensor ALS TCON LGD 23 8 eDP I2C PWM USB2 0 DDC I2C I2C I2C PWM eDP I2C I2S VBUS VBUS USB2 0 PD Controller TI IC100 TBT IC IC600 PD Controller TI IC101 TBT A_CC1 2 USB2_A TBT B_CC1 2 USB2_B TBT 40Gbps TBT 40Gbps UART RX TX DP Out TBT B TBT A USB3 GEN1 USB 2 0 Mux Block USB2_PA USB2_PB USB2_TR_A ...

Page 8: ...teristics These parts are identified by in 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 HR2 HP1 900 540 LV1 130 120 580 HM1 300 200 400 830 AM1 700 545 590 HR3 530 ...

Page 9: ...UIDE 1 No Power Change the X500 N Check C950 Voltage 20V Check the Power Connection Change the PSU Power Board Y N Y Check IC903 Voltage 3 3V Change the IC902 Y N Check X500 Clock 14 318MHz Check IC904 Voltage 1 1V Change the IC903 N Y Change the Flash IC501 Y Check IC901 Voltage 1 8V Change the IC904 N Y ...

Page 10: ...acklight Change the LED Sub Board Y N N Check the Voltage L903 10V Change the IC900 Y N Check the eDP Aux signal of Panel P501 17 18 Check the Solder status of IC500 And change the Main Board Y N Check the FFC Cable Check the Output of LED Driver P901 1 5 Change the Panel or T Con board Y Change IC501 N Check the Signal WLED_ENABLE is High Y ...

Page 11: ...training and service purposes 3 TBT Up No Display Change the IC500 Check the setting of resolution and Vertical Frequency Check the Cable connection of JK1000 JK1001 Connect the Cable to JK1000 JK1001 Y N Y Check the TBT Cable connection and damage of Cable Y ...

Page 12: ...ly training and service purposes 4 Display Color changed to Gray Check the Foreign material of internal FAN Y Remove the Foreign material Check the Display 10min Color changed to Gray Change the FAN N Change the Main PCBA Or Change the Temperature Sensor Y ...

Page 13: ...TRAINING MANUAL Copyright ⓒ 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 14: ... Please guide the method according to PC as below 24MD4KL 27MD5KL Brightness Audio output Apple Logo System Preferences Display adjust Brightness in the Monitor PC Brightness can be adjusted with PC setting Sound Select LG UltraFine Display Audio and can adjust Output Volume in bottom side Select the Speaker Icon in Windows Tray and then select LG UltraFine Display Audio for adjusting the Volume i...

Page 15: ...he compatibility issue such as No display or No sound etc with TBT 2 to 3 Adapter 2 Root Cause Apple Device or Adapter Limitation 3 Guidance 1 Checking the symptom To guide the customer that they need to check the Apple Device List in Apple website And it may caused by TBT2 to 3 Adapter or Apple Devieces 24MD4KL 27MD5KL Copyright ⓒ 2019 LG Electronics Inc All rights reserved Only training and serv...

Page 16: ...inding that the SF model is a Mac only monitor you need to ask if customer is using a Windows PC b Especially for Windows PCs with Razor Blade RZ09 2015 PCs we recommend connecting the USB device to PC because It is a PC problem It is already verified c For Windows PCs You can check Thunderbolt Version in the following order Reference For Razor Blade RZ09 2015 PCs NVM version is14 and for Razor Bl...

Page 17: ...nding of connection ports 3 Guidance 1 Checking the symptom If USB unrecognized problems occur check the following a Check which port the USB device or USB HUB is connected to 2 Customer Guide Port configuration can be divided into Host input port and USB expansion port the USB device or USB HUB must be connected to the USB expansion port for normal operation 24MD4KL 27MD5KL Thunderbolt input port...

Page 18: ...ce 1 Checking the symptom Ask the customer if they used Daisy Chain check the 2nd monitor model name and cable type 2 Customer Guide a Recommend to use the enclosed Thunderbolt cable when using the Daisy Chain b 2nd monitor in Daisy Chain is recommended to use the 24MD4KL model whenever possible Guide that problems may occur when using other models 24MD4KL Thunderbolt input port USB expansion port...

Page 19: ...pt 3 Guidance 1 Checking the symptom Ask to customer if they use 2 PCs at the same time and check if the screen does not display or charge after rebooting the PC 2 Customer Guide a Problem can be occur if you connect a PC to each of the Thunderbolt input ports as shown below b The reason why there are the two Thunderbolt input ports is for the Daisy Chain function 24MD4KL 썬더볼트 입력 Port USB expansio...

Page 20: ...ool Size if applicable Screw driver Plastic stick Jig Tool Disassemble Process Place Set on the table Remove the stand by operating the stand release button Copyright ⓒ 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 21: ...e lower section of the cabinet If the upper part is disassembled first it may cause ALS damage first Detach Bottom Left Right CA BC using plastic jig Rear shield Remove the module tightening screw 10EA Copyright ⓒ 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 22: ...ve the rear shield and the FFC cable Remove the ALS sensor from the top of the module after separating the CA from the module Removing Screw 15EA separate Main Power Temperature sensor Fan Copyright ⓒ 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 23: ...ocess DMS chassis disassemble picture Rear shield Assy Speaker Main Board Power Board Shield Bottom bracket Fan Temp sensor Sub board Copyright ⓒ 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

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