LG MG120a Service Manual page 61

CHECKING FLOW
START
Resolder CON300
Does the audio
profile of the phone
change to the
earphone mode?
YES
Set the audio part of the test
Equipment to echo mode
NO
Can you hear your
voice from
the earphone?
YES
Earphone will work properly
NO
NO
R328 is LOW
YES
Set the audio part of
the test equipment to
Change the earphone
PRBS or continuous
and try again
Can you hear your
voice from
the earphone?
YES
Change earphone
YES
Change the main board.
-61-
4. TROUBLE SHOOTING
Resolder R328
Resolder component
Download software
wave mode
No
Can you hear
the sound from
the earphone?
YES
Download software.
Does it work well?
NO
Voltage at
C315
=1.2V ?
YES
Check soldering
C315
R338
YES
Change the main board.