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Acer B243W Service Manual page 34

Acer computer monitor user manual
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3. White screen
White screen
Measure Q707 base
is low level?
OK
Check
Q705,Q706,Q707
broken or CN703 solder?
OK
Replace PANEL
NG
is
NG
Check
Correspondent
component.
X402
waveform is normal
OK
Check U403/U407
NG
Replace U403/U407
34
oscillate
NG
Replace X402
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