Trouble Shooting Guide - LG 27UL500 Service Manual

First of all, Check whether there is SVC Bulletin in GCSC System for these model.
No Power
Check JP400
Voltage Level (19V)
Y
Check IC601 Output
Voltage Level (+3.3V)
Y
Check IC405, IC403, IC404 Output
Voltage Level (5V,1.8V, 1.15V)
Y
Check X200 Clock
12MHz
Y
Replace IC202 Flash Memory
No Screen on
Module Back Light On?
Y
Check Panel Power
10V(JP209)
Y
Check e-DP Cable for
Damage or Open
Conductors
Y
Replace T-Con Board or
Module

TROUBLE SHOOTING GUIDE

N
Check Power connector
OK ?
N
Replace IC601 &
Recheck
N
Replace IC405, IC403, IC404
&Recheck
N
Replace X200
N
Check WLED_ENABLE High?
(IC601 Pin #27)
N
Replace IC402 &
Recheck
N
Replace Cable
Y
N
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Replace Adapter
Check IC 601
Replace Main Scaler IC
Only training and service purposes