Acer P243W Service Manual page 29

ACER P243W
28
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5.9 Checking the DC/DC converter circuit
from P301 pin1, pin2, pin3, pin4
and 1.8V line voltage is output
from I301, I302, I303 pin2
Printed wire is broken
between I301, I302, I303
pin2, and I314 power supply
pin.
5. Troubleshooting (continued)
Check if the 5V is output
to I301, I303, I320 pin3.
OK
Check if the 3.3V, 2.5V
OK
Failure Point
Printed wire is broken between
P301 pin1, pin2, pin3, pin4 and
NG
I301, I303, I320 pin3.
Is the output
NG FB301 being supplied to
I301, I303, I320 pin3?
OK
Failure Point
I301, I303, I320 is defected.
Failure Point
NG
Failure Point
Printed wire is broken
between I301, I303, I320
pin3 and output of FB301