Ear-Mic Jack Detection Trouble - LG KM380t Service Manual

6.8 Ear-MIc Jack Detection trouble

Check the Ear-Jack detection.
Check the soldering
status of CN301
Is the status of FB301(TP1),
The main board has a
Replace Main PCB
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Only for training and service purposes
START
Yes
FB302 (TP2) low?
Yes
problem
Assemble
No
Resoldering or
Replace CN301
No
Resolder FB301,
FB302
CN301
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6. Trouble shooting
TP1 TP TP TP2
FB301 FB302 FB3 302
Ear-Jack
Signal
LGE Internal Use Only