Abnormal Plug And Play Operation - Acer AL1702 Service Manual

6. Abnormal plug and play operation

Confirm the host computersupplies DDC2 mode.
Check the voltage on P302 pin13 that is power DC
Check the voltage on I304 pin8 that is power DC 5
Check the voltage on P302 pin11, 12 that is serial
Check the output signal of serial data / clock on I304
Failure Point
1) Printed wire broke between I309 pin2, 3, I304
pin5, 6 and P302 pin11, 12.
2) I309 maybe failure.
3) R336, R337 is open.
4) C349, C350 is short.
Page 18
NG
OK
5 V.
NG
OK
V.
NG
OK
data / clock signal.
NG
OK
pin5, 6.
NG
OK
Failure Point
The host machine is not communicatiog in DDC2
mode.
Failure Point
TheVideo cable is failure.
Failure Point
1) Printed wire broke between I304 pin8, D309,
D310 and P302 pin13.
2) D309 or D310 is failure.
3) D315 is failure.
Failure Point
TheVideo cable is failure.
Failure Point
I304 is failure.
AL1702