Checking The Dc/Dc Converter Circuit - Acer A221HQV Service Manual

ACER A211H/A221HQ
32
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5.1.9 Checking the DC/DC converter circuit:

Check the 5V is output from P301 pin
Check the 5V is input to I304 pin3.
Check the 3.3V is output from I304 pin2,4
Check the 3.3V is input to I305 pin3.
Check the 1.2V is output from I305 pin2,4.
Failure Point
Printed wire broke between I304 pin2,4,
I305 pin3
5. Troubleshooting (continued)
4,5,6.
OK
NG
OK NG
OK
NG
OK
NG
OK NG
Failure Point
1) Power wire disconnection.
2) Power board is failure.
Failure Point
Printed wire broke between P301 pin
4,5,6 and I304 pin3.
Failure Point
I304 is failure or C308 short.
Failure Point
Printed wire broke between I304 pin2.
4 and I305 pin3.
Failure Point
I305 failure or C311 short.