19" LCD Color Monitor
9.2Trouble Shooting
9.2.1 Main Board
1.NO SCREEN APPEAR
No power
No power
Press power key and look if the picture is normal
NG
Please reinsert and make sure the AC of
NG
OK
Measure U404 Vout=3.3V
U405 Vout=1.8V
NG
OK
X401 oscillate waveforms are normal
NG
OK
Replace U401
AOC 919Swa
Reinsert or check the power section
Replace
U404,U405,CN404
Replace X401
30