Checking The Resolution Change Ic Movement - HP R15AAC Service Manual

10. Checking the resolution change IC movement

Check +3.3V supply on I307 pin2, 25, 47, 53, 91, 92, 74, 82, 101, 110,
Check +1.8V supply on I307 pin118, 87, 55, 17, 86, 78, 70, 104, 106.
Check X301 14.318MHz clock input to I307 pin108 and 109 at TTL
Check I307 pin111 RESETn signal is high level at normal operation.
Check I307 pin59, 60, 61, 62,SPI_ROM control data
Failure Point
I307 failure.
116, 128.
NG
OK
NG
OK
level.
NG
OK
NG
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 pin108, 109.
2) C347, C348 short or open.
3) X301 failure.
Failure Point
1) Check I308 pin2 is low level wait 240ms to high level, when AC
power is plug in.
2) I308 failure.
3) Printed wire broke between I307 pin111 and I308.
2) C351 short.
3) I307 failure.
Failure Point
1) Printed wire broke between I307 pin59, 60, 61, 62 and I310.
2) I310 failure.
R15AAC/AAU (vs15)
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