LG -T300 Service Manual page 92

CHECKING FLOW
START
Can you hear
the sound from
the earphone?
YES
Set the audio part of the test
Equipment to echo mode
Can you hear your
voice from
the earphone?
Earphone will work properly
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Only for training and service purposes
Resolder J301
(3.5 Ear-Mic con)
Change
NO
the earphone
and try again
NO
Change the earphone
and try again
Can you
hear the sound from
The earphone?
YES
Set the audio part of the test
equipment to PRBS or
Continuous wave mode
Can you hear
the sound from
the earphone?
YES
Can
you hear your
voice from
the earphone?
YES
- 9 -
4. TROUBLE SHOOTING
Resolder J301
Resolder
NO
L301,L302,FB301,
FB302,
C230,C231
Resolder FB303,R301,
R317,C303,C302,C321,
NO
C304,C305,C306
Or change the
U203(amp),U102(BB IC)
LGE Internal Use Only
NO