LG F3000 - Page 81

4. TROUBLESHOOTING
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START
Earphone will work Properly
Does the audio Profile
of the phone change to
the earphone mode?
Insert the earphone to the handset.
Can you hear your vioce
from the earphone?
Set the audio part of the test
equipment to echo mode
Earphone detect problem
Audio path problem
1
Set the audio part of the
test equipment to PRBS
or continuous wave mode
Change the earphone and
try again.
Can you hear your voice
from the earphone?
Change Earphone.
Can you hear the sound
from the earphone?
2
Earphone receiving
path problem
Earphone sending
path problem
3
4
Yes
Yes
No
No
Yes
No
No
Checking Flow
Earphone receiving path problem
Level of C213 and C217
is about 1.2V
Yes
Check soldering
R204, R211, R214,
C213, C217, J201
Download
S/W
No
Re-soldering R204,
R211, R214, C213,
C217, J201
Not good
Yes
Change
main board
2