Acer RA19WAANU Service Manual page 30

5.10 Checking the resolution change IC movement
Check +3.3V supply on I305 pin41,I308 pin1,46.
Check +1.8V supply on I308 pin 19,17,40.
Check X300 24MHz clock input to I305 pin 15 and 16 at TTL level.
Check I305 pin 4 RST signal is low level at normal operation.
Check I305 pin 38,39,40 IIC signal.
Failure Point
I305 failure.
5. Troubleshooting (continued)
NG
OK
NG
OK
NG
OK
OK
NG
OK
Proceed " Checking the DC/DC converter circuit" section.
Proceed " Checking the DC/DC converter circuit" section.
Failure Point
1) Printed wire broke between X300 and I305 pin 15, 16.
2) C340, C341 is short or open.
3) X300 failure.
Failure Point
1) Printer wire broke between I305 pin 4 and
C345
2) C345 is short.
NG
3) I305 is failure.
Failure Point
1) Printed wire broke between I305 pin 38, 39, 40 and I303 pin 5, 6,7.
2) R351,R352,R353 is open.
3) R395,R396,R397 is open or short.
4) I303 is failure.
ACER X193HQ 29
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