LG C1100 Service Manual page 79

4. Trouble Shooting
Checking Flow
START
Insert the earphone to the phone.
Does the audio
profile of the phone change to
the earphone
mode?
Set the audio part of the test
equipment to echo mode.
Can you hear your vioce from
the earphone?
4
EARPHONE WILL
WORK PROPERLY.
Earphone receiving path problem
3
voltage at C139=~1.2V
Check soldering
C139,R141,J102
Replace
main board
Earphone detect problem
Audio path problem
Yes
No
Change the earphone
Yes
Change Earphone.
Download S/W
Yes
No
Re-solder
C139,R141,J102
Yes
No
Set the audio part of the test
and try again.
Can you hear the sound from
Can you hear No
your voice from
the earphone?
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1
Earphone receiving path
equipment to PRBS or
continuous wave mode.
No
Earphone sending path
problem
Yes
3
problem
2