Acer NA23WABAS Service Manual page 34

5.6 Abnormal OSM display adjust problem
Check the input TTL level whether is changed when pressed
function keys on the P306 pin4, 5 (normal is high level, when
Check the input TTL level of I307 pin125, 126 whether is
changed when pressed function keys.
Failure Point
I307 is failure.
5. Troubleshooting (continued)
push button, generated low level)
NG
OK
NG
OK
Failure Point
1) Function key wire disconnection.
2) Function key wire is failure.
3) Function key board is failure.
Failure Point
1) Printed wire broke among P306 pin4,R369 and I307 pin125
2) Printed wire broke among P306 pin5 ,R372 and I307 pin126
3) C388,C386 is short.
33
ACER V233H
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