Acer AL1906 Service Manual - Page 34
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2. No picture (LED is orange)
Measure U701 PIN2=3.3V
X401 oscillate waveforms are
normal
Check if the sync signal from
computer is output and video cable
is connected normally
No picture
U702 PIN2=3.3V
OK
OK
NG
NG
OK
Replace U401
NG
Replace U701, U702
Replace X401
Input the sync signal of
computer,
or
cable
33
change
the