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LGE Internal Use Only
Copyright © 011 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
CHECKING FLOW
START
Earphone will work properly
Can you hear your
voice from
the earphone?
Set the audio part of the test
Equipment to echo mode
Change the earphone
and try again
YES
YES
Resolder TP3
Can you hear
the sound from
the earphone?
NO
Change the earphone
and try again
NO
Can you hear your
voice from
the earphone?
NO
For Sound
Resolder TP4,TP5, TP6
Resolder IC200,
TP10, TP11,
TP12, TP13
Plug 3.5phi
Check the
TP1 is LOW?
Check the
TP1 is High?
NO
Resolder TP2
NO
Check the
TP1 is LOW?
YES
NO
Change PCB
Check the
TP1 is High?
NO
YES
YES
YES
NO
Can you hear
the sound from
the earphone?
For MIC
Resolder TP7, TP8, TP9