LG UltraFine 27MD5KA Service Manual page 7

2. No Video – Thunderbolt3_Check IC200
N
Check C1102
Voltage Level (20V)
Y
N
Check IC1104 Output
Voltage Level (3.3V)
Y
N
Check L305 Output
Voltage Level (0.9V)
Y
N
Check X200 Clock
25MHz
Y
Replace IC200
Y
Check Power connector
OK ?
Replace IC1104 &
Recheck
Replace IC203 Flash
Memory
Replace X200
Replace PSU
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