Acer AL1951 Service Manual page 33

2. No picture (LED is orange)
Key is under control?
OK
X401 oscillate waveform
is normal
OK
Check if the sync signal from
computer is output and video
cable is connected normally
OK
Replace U401
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No picture
NG
NG
NG
X402 oscillate waveform
is normal
Replace U402
Replace X401
Input the sync signal of computer,
or change the cable
33
NG
Replace X402
OK
NG
Replace U401