AOC i2252VWH - 8.3 Troubleshooting; Main Board - No Power Troubleshooting

Service Manual AOCi2252VW
40
8.3 Trouble Shooting
Main Board---
No Power
No power
Press power key and look if
the picture is normal
Please reinsert and make sure the AC
100-240V is normal
?
Reinsert or check the power section
Check 5V-CN404, 3.3V-U404-2;
1.8V-Q409/Q410,Panel-Vcc-Q405
Check X401 waveform
Replace U402/U401
Re
p
lace X401
OK
NG
Check&replace
CN404,U404,Q409,Q410,Q405
NG
NG
NG
OK
OK
Check flow chart
For the no power