Acer AL2251W Manuale di servizio - Pagina 34

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2. No Picture
No picture
The button if
under control
OK
Measure U201 PIN2=2.5V
U202 PIN2=3.3V
OK
X401
waveform is normal
OK
Check HS/VS from
CN301 is normal
Replace U401
OK
Replace U401
NG
NG
Replace
U201, U202
oscillate
NG
NG
X601 oscillate
waveform is normal
OK
Check reset circuit of
U601 is normal
OK
Replace U601
Replace X401
Check Correspondent
component
34
NG
Replace X601
NG
Check Correspondent
component