Abnormal Plug And Play Operation; Abnormal Plug And Play Operation For Vga - HP WF1907 Service Manual

4.6 Abnormal plug and play operation

4.6.1 Abnormal plug and play operation for VGA

Confirm the host computer supplies DDC/CI mode.
Check the voltage on P302 pin 9 that is DC 5 V.
Check the voltage on I304 pin 8 that is DC 5 V.
Check the signals if is high level on P302 pin 12, 15
that is I2C data / clk signal.
Check the output signal of I2C data / clk on I304 pin 5,
Failure Point
1) Printed wire broke between I306 pin 65, 64, I304 pin
5, 6 and P302 pin 12, 15.
2) I306 maybe failure.
3) R328, R329 is open.
4) C331, C332, R326, R327 is short.
NG
OK
NG
OK
NG
OK
NG
OK
6.
NG
OK
Failure Point
The host machine is not communicated in DDC/CI
mode.
Failure Point
The VGA video cable is failure.
Failure Point
1) Printed wire broke between I304 pinv8, D307 and
P302 pin 9.
2) D307 is failure.
Failure Point
The VGA video cable is failure.
Failure Point
I304 is failure.
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