Checking The Dc/Dc Converter Circuit - HP VF15 Service Manual
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vf15 / FP15 / f1523 / FP5315
9 Checking the DC/DC converter circuit
9.1
Check the output of 3.3V line voltage
from I309 pin 4.
Is the output FB331 being inputted
NG
to I309 pin 1.
Failure point
NG
OK
Printed wire broke between I309
OK
pin 1 and FB331.
Failure point
I309 failure
Failure point
Printed wire broke between I309 pin 4 and I303 power supply pin.
9.2
Check the output of 2.5V line voltage
from I309 pin 5.
Is the output FB331 being inputted
NG
to I309 pin 1?
Failure point
NG
OK
Printed wire broke between I309
OK
pin 1 and FB331.
Failure point
I309 failure
Failure point
Printed wire broke between I309 pin 5 and I303 power supply pin.
Page 22
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