LG UltraFine 27MD5KA Service Manual page 27

3. Repair Guidance (for repair)
Title No TBT3 (Thunderbolt 3) Connection
Product Monitor
Issue Function
■ Symptom
Symptom
There's no response when connecting Macbook with the thunderbolt cable. No charging display and no response to display
■ Check item
1. Measure the impedance of Q102 G-D pin with DVM (multi-meter), if short (0 ohm), replace Q102
Check
2. With PCB P/N EAX67089601, measure R118. if it's over than 0 ohm, replace R118 (0 ohm).
3. Check customer's thunderbolt cable because it is one of the reason that no TBT responses.
■ PCB P/N EAX67089601
Check
Q102
0 ohm
No
Detail
Contents
Product MD5K Model
Detail issue
Replace
Yes
Q102
Check
No
R118
0 ohm
<Only PCB P/N EAX67089601>
27MD5KA
Unable to Charging function and No display
Some Thunderbolt cable has a risk to cause this issue.
So, please replace the thunderbolt cable when swapping
PCBA.
Replace
R118
Domestic(√) Overseas(√
customer(
Troubleshooting (√ ) Operation ( ) Installation ( )
■ Check Thunderbolt Cable
Copyright ⓒ 2016 - 2018 LG Electronics Inc. All rights reserved.
Only training and service purposes.
2016.11.07
) consultant( √ )
√ )