Checkthe 5V is output from P301 pin 4,5,6.
OK
NG FailurePoint
1)Power wire disconnection.
2)Power board is failure.
Checkthe 5V is input to I304 pin3.
OK
NG FailurePoint
1)Printed wire broke between P301 pin 4,5,6
andI304 pin3.
Checkthe 3.3V is output from I304 pin2, 4.
FailurePoint
1)I304 is failure
2)C306 or C308 short.
OK
NG
Checkthe 3.3V is input to I305 pin3.
OK
NG FailurePoint
1)Printed wire broke between I304 pin2. 4 and
I305pin3.
Checkthe 1.2V is output from I305 pin2,4.
FailurePoint
1)I305 is failure
2)C310 or C311 short.
OK
NG
FailurePoint
1)FB311 or FB312 or FB319or FB320 is open.
5.11Checking the DC/DC converter circuit
Go to cover page
34 5.Troubleshooting (continued)
ACERH233H