Acer RA19WAANU Service Manual page 31

30 ACER X193HQ
Go to cover page
5.11 Checking the DC/DC converter circuit
5. Troubleshooting (continued)
Check the 5V is output from P301 pin 5,6
OK
Check the 5V is input to I301 pin3.
OK
Check the 3.3V is output from I301 pin2, 4.
OK
Check the 3.3V is input to I309 pin3.
OK
Check the 1.8V is output from I309 pin2,4.
OK
Failure Point
1) Printed wire broke between I301 pin2,4,I309 pin3,2,4
and I308
2) FB309,FB310 is open.
Failure Point
NG
1) Power wire disconnection.
2) Power board is failure.
NG
Failure Point
1) Printed wire broke between P301 pin 5,6
and I308 pin3.
Failure Point
NG
I301 is failure or C303,C304 short.
Failure Point
NG
1) Printed wire broke between I302 pin2. 4 and
I309 pin3.
Failure Point
NG
I309 failure or C368 short.