HP VF15 Service Manual page 16

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Check the 3.3 V power are supplied on I309 pin 4
1) Check +18V / +3.6V / -6V on P307 and +3.3V.
2) Check +9.2 V on P308.
Is a dot clock being outputted under the
condition that a LCD module is connected to
P308 pin 3?
Check the pulse of POL / HMS2 / HMS1 / LP /
STH are output on P308 pin 44, 45, 46, 47,
48 at TTL level.
Check the CLKV/STV1 pulse are output on
P307 pin 7, 8.
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and 2.5V on pin 5.
Check if the voltage on I309 pin1 that
NG
is high level DC at 5V.
OK
OK
Failure point
I309 Failure
OK
NG
OK
NG
OK
NG
OK
vf15 / FP15 / f1523 / FP5315
NG
1) Printed wire broke between P309 and I309.
2) FB327, FB328 or FB331 open.
NG Refer "Checking the panel power circuit"
1) I303 failure
2) Printed wire broke between I303 and P308 pin 3.
1) I303 failure
2) Printed wire broke between I303 and P308 pin 44,
45, 46, 47, 48.
1) I302 failure
2) Printed wire broke between I303 and P307 pin 7, 8.
Failure point
Failure point
Failure point
Failure point