Service manual

4.9 Checking the resolution change IC movement
1. Check +3V3 supplied on I306
pin2, pin25, pin53, pin47, pin74,
pin82, pin91, pin92, pin101. pin110,
pin116
2. Check +3V3 supplied on I309
pin8.
Proceed ‘Checking the DC/DC converter circuit’ sectionNG
1. Check +1V8 supplied on I306
pin55, pin87, pin17, pin118, pin70,
pin78, pin104, pin106.
2. Check +1V8 supply on I305 pin46,
pin53, pin86, and pin122.
Proceed ‘Checking the DC/DC converter circuit’ section
OK
NG
Check X301 14.318M Hz clock input to I306
pin108 and pin109 at TTL level
OK
Failure Point:
1. Printed wire broke between X301 and I306 pin108
and pin109
2. C362 or C 373 may be short or open.
3. X301 is damaged.
NG
Check I306 pin111 RSTB signal is high level at
normal operation.
Failure Point:
1. Printed wire broke between I306 pin111 and I307
pin2.
2. C375 is short.
3. I307 or I306, Q 305 is damaged.
4. R349, R348 is open.
NG
OK
1.Check I309 pin8, pin3, pin5, pin6.
2.Check I308 pin5, pin6, pin7, pin8.
Failure Point:
I306 is defected.
Failure Point:
1. Printed wire broke between I309 pin5, pin6 and
I306 pin61, pin62.
2. I306, I309 is defected.
3. R362,R364,R365,R366,R359,R360 or R361
is open.
NG
OK
OK
4. Troubleshooting (continued)
Go to cover page
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ACER AL1716W