Acer AL1702 Manuale di servizio - Pagina 22
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8. Checking the resolution change IC movement
Check +3.3V supply on I305 pin11, 21, 84, 94, 104, 114, 126, 55,
Check +2.5V supply on I305 pin18, 87, 97, 117.
Check X301 14.318MHz clock input to I305 pin33 and 34 at TTL
Check I305 pin32 HWRESET signal is low level at normal
Check I305 pin69, 70, 71 3-wire bus signal is (Same of the IIC
Failure Point
I305 failure.
Page 20
65, 35, 45, 51, 53.
NG
OK
NG
OK
level.
NG
OK
operation.
NG
OK
signal).
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 I305 pin33, 34.
2) C371, C375 short or open.
3) X301 failure.
Failure Point
1) Printed wire broke between I305 pin32 and I307 pin23.
2) R410, R380 open.
3) I307 failure.
Failure Point
1) Printed wire broke between I305 pin69, 70, 71 and I307 pin20, 21,
22.
2) I307 failure.
AL1702