LG VX5400 Service Manual page 103

Checking Flow
START
Insert the earphone to the handset.
Yes
Does the audio
Profile of the phone change to
the earphone mode?
Yes
Set the audio part of the test
equipment to echo mode
Yes
Can you hear your voice
from the earphone?
4
Earphone will
work properly
Earphone receiving path problem
2
Level of C603
is about 1.2V
Yes
Check soldering of
Pin 3 of CON600
Yes
Change
main board
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Only for training and serving purposes
Audio path problem
No
Change the earphone and
try again.
Yes
Can you hear your voice
from the earphone?
Change Earphone.
No
Download
S/W
No
Re-soldering of
Pin 3 of CON600
Earphone detect problem
No
Set the audio part of the
continuous wave mode
Yes
No
Yes
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1
test equipment to
Yes
No
Can you hear the sound
from the earphone?
Earphone sending
path problem
Yes
3
LGE Internal Use Only
Earphone receiving
Path problem
2