Acer NA23WABAS Service Manual page 46

5.6 Abnormal OSM display adjust problem
Check the input TTL level whether is changed when pressed
function keys on the P308 pin4, 5 (normal is high level, when
push button, generated low level)
Check the input TTL level of I312 pin49, 50 whether is
changed when pressed function keys.
Failure Point
I312 is failure.
5. Troubleshooting (continued)
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 P308 pin4,R405 and I312 pin50
2) Printed wire broke among P308 pin5 ,R406 and I312 pin49
3) C362,C361 is short.
4) D331,D330 is short
45
ACER V233H
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