Acer NA23WABAS Service Manual page 38

5.10 Checking the resolution change IC movement
Check +3.3V supply on I302 pin2.
Check +1.8V supply on I310 pin 2.
Check X301 12MHz clock input to I307 pin 127 and 128 at TTL level.
Check I307 pin 114 RSTB signal is high level at normal operation.
Check I312 pin 104,105,106,107 SPI signals.
Failure Point
I307 is 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 I307 pin 127, 128.
2) C379, C380 is short or open.
3) X301 failures.
Failure Point
1) Printer wire broke between I307 pin 1 and
C391
2) C391 is short.
NG
3) I307 is failure.
Failure Point
1) Printed wire broke between I307 pin 104, 105, 106,107 and I306 pin 1,2,
5,6.
2) I306 is failure.
37
ACER V233H
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