Abnormal Osd Display Adjust Problem - Acer A221HQV Service Manual

5.1.5 Abnormal OSD display adjust problem:

Check the input TTL level whether is changed
when pressed function keys on the P310 pin 5,
6 (normal is high level, when push button,
generated low level)
Check the input TTL level of I308 pin 50, 51
whether is changed when pressed function
Failure Point
I308 is failure.
5. Troubleshooting (continued)
OK NG
keys.
OK NG
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 P310
pin5, R503 and I308 pin50
2) Printed wire broke among P310
pin6 ,R504 and I308 pin51
ACER A211H/A221HQ 27
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