AOC LM927U Service Manual page 35

White screen
Check
Correspondent
component
White screen
Measure Q204 base
is high level?
NG
OK
Check Q203 is broken or
CN503 solder?
NG
OK
Replace PANEL
Measure U201 PIN2=2.5V
U202 PIN2=3.3V
OK
NG
X401 oscillate waveform
is normal
OK
Replace U401
35
AOC LM927U
Check
Correspondent
component
NG
Check
Correspondent
component