HP WF1907 Service Manual page 14

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Check the 5V power are supplied on P306
pin 1, 2, 3 (to the LCD panel)
NG
OK
Check the P306 all LVDS signals.
NG
OK
Failure Point
1) The LVDS cable broke between P306
and LCD module.
2) LCD module is failure.
Check if the Voltage on I301 pin 2 that is
DC power at 5V.
NG
OK
Check if the MOS FET Gate level on I301
pin 1, that Gate level is low.
NG
OK
Failure Point
I301 is failure.
Failure Point
1) Printed wire broke between P306 and
I306 LVDS signals.
2) I306 is failure.
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Failure Point
1) Printed wire broke between P301 pin 5,
6, and I301 pin 2.
2) FB301 or FB302 or FB303 is open.
Check the PANELVCC_EN signal of the
Q302 pin 2 (with R309) at high level.
Failure Point
NG
1) Printed wire broke between Q302
OK
pin 3, R307, R308, C309 and I301 pin
1.
2) Q302 is failure.
Failure Point
1) Printed wire broke between Q302 pin 2
and I306 pin 127.
2) I306 is failure.