Acer NA23WABAS Service Manual page 50

5.10 Checking the resolution change IC movement
Check +3.3V supply on I301 pin2.
Check +1.2V supply on I305 pin 2.
Check X301 12MHz clock input to I312 pin 116 and 117 at TTL level.
Check I312 pin 114 RSTB signal is high level at normal operation.
Check I312 pin 70,71,72 SPI signal.
Failure Point
I312 failure.
5. Troubleshooting (continued)
NG
OK
NG
OK
NG
OK
OK
NG
OK
Proceed " Checking the DC/DC converter circuit" section.
Proceed " Checking the DC/DC converter circuit" section.
Failure Point
1) Printed wire broke between X301 and I312 pin 116, 117.
2) C354, C356 is short or open.
3) X301 failure.
Failure Point
1) Printer wire broke between I312 pin 114 and
C359
2) C359 is short.
NG
3) I312 is failure.
Failure Point
1) Printed wire broke between I312 pin 70, 71, 72 and I313 pin 2, 5,6.
2) I313 is failure.
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ACER V233H
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