Acer A221HQV - Page 42

5. Troubleshooting (continued)
5.2.5 Abnormal OSD display adjust problem:
OK
NG
Failure Point
1) Function key wire disconnection.
2) Function key wire is failure.
3) Function key board is failure.
Check the input level whether was
changed when pressed function keys on the
CN304 pin 1, 2. (Normal is 3.3V, when push button,
genertaed different voltage. Pin 1, 2 is 0.69V or
1.65V or 2.11V)
Check the input level whether was
changed when pressed function keys on the I310 pin
52, 53. (Normal is 3.3V, when push button, genertaed
0.69V or 1.65V or 2.11V)
NG
Failure Point
1) Printed wire broke between CN304 pin 1, I310 pin 52.
2) Printed wire broke between CN304 pin 2, I310 pin 53.
3) C363 or C364 is short.
4) R380 or R381 is short or open.
4) R382 or R383 is open.
Failure Point
I310 is failure
OK
40
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ACER A211H/A221HQ