Trouble Shooting; Main Board - AOC LM927U Service Manual

8.2 Trouble Shooting

8.2.1 Main Board

No power
Please reinsert and make sure
the AC of 100-240 is normal
No power
Press power key and look
if the picture is normal
NG
NG
OK
Measure U201 PIN2=2.5V
U202 PIN2=3.3V
NG
OK
X401 and X601 oscillate
waveforms are normal
NG
OK
Replace U601
NG
Replace U401
Reinsert or check
the power section
Check Correspondent
component.
Replace X401, X601
33
AOC LM927U