Acer AL2251W Service Manual page 35

3. White Screen
White screen
Measure Q204 base
is low level?
OK
Check Q204 is broken or
CN503 solder?
OK
Replace PANEL
4. Keypad Board
NG
NG
Check Correspondent
component.
X601 oscillate
waveform is normal
OK NG
Check reset circuit of U601
is normal
NG
OK
Replace U601
35
Replace X601
Check Correspondent
component.