Abnormal Plug And Play Operation; Abnormal Plug And Play Operation For Vga - HP R15AAC Service Manual

8.

Abnormal plug and play operation

8.1

Abnormal plug and play operation for VGA

Confirm the host computersupplies DDC2 mode.
Check the voltage on P302 pin9 that is power
Check the voltage on I306 pin8 that is power DC 5 V.
Check the voltage on P302 pin12, 15 that is serial data
Check the output signal of serial data / clock on I308
Failure Point
1) Printed wire broke between I309 pin5, 6 and P302
pin12, 15.
2) R332, R333 is open.
3) C338, C339 is short.
NG
OK
DC 5 V.
NG
OK
NG
OK
/ clock signal.
NG
OK
pin5, 6.
NG
OK
Failure Point
The host machine is not communicatiog in DDC2
mode.
Failure Point
The VGA video cable is failure.
Failure Point
1) Printed wire broke between I306 pin8, D306, D309
and P302 pin9.
2) D306 is failure.
3) D310 is short.
Failure Point
The VGA video cable is failure.
Failure Point
I308 is failure.
R15AAC/AAU (vs15)
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