LG C1150 Service Manual page 84

Checking Flow
START
Insert the earphone to the phone.
Does the audio
profile of the phone change to
the earphone mode?
Audio path problem
Yes
Set the audio part of the test
equipment to echo mode.
Can you hear your vioce from
No
the earphone?
Yes
4
EARPHONE WILL
WORK PROPERLY.
Earphone receiving path problem
3
No
voltage at C160=~1.2V
Yes
Not good
Check soldering
C160,R143,J102
Yes
Replace
main board
Earphone detect problem
No
Change the earphone and try again.
No
Can you hear your voice from
the earphone?
Yes
Change Earpho ne.
Download S/W
Re-solder
C160,R143,J102
- 85 -
4. TROUBLE SHOOTING
1
Earphone receiving path
Set the audio part of the test
equipment to PRBS or continuous
wave mode.
Can you hear the sound from
No
the earphone?
Yes
Earphone sending path
problem
3
problem
2