Earphone Trouble - LG gd350 Service Manual

4. TROUBLE SHOOTING

4.10 Earphone Trouble

4.10 Earphone Trouble
CHECKING FLOW
CHECKING FLOW
START
START
Resolder CN201
Resolder CN201
Check the
Check the
pin(#8) in CN201 is
pin(#8) in CN201 is
LOW?
LOW?
YES
YES
Set the audio part of the
Set the audio part of the
test equipment to PRBS or
test equipment to PRBS or
Continuous wave mode
Continuous wave mode
Can you hear
Can you hear
the sound from the sound from
the earphone?
the earphone?
YES
YES
Set the audio part of the test
Set the audio part of the test
Equipment to echo mode
Equipment to echo mode
Can you hear your
Can you hear your
voice from
voice from
the earphone?
the earphone?
Earphone will work properly
Earphone will work properly
LGE Internal Use Only
NO
NO
Resolder pin8 in CN200
Resolder pin8 in CN200
NO
NO
Change the
Change the
earphone earphone
and try again
and try again
NO
Change the
NO
Change the
earphone
earphone
and try again
and try again
4. TROUBLE SHOOTING
4. TROUBLE SHOOTING
Can you hear Can you hear
the sound from
the sound from
the earphone?
the earphone?
YES
YES
Can you hear your
Can you hear your
voice from
voice from
the earphone?
the earphone?
YES
YES
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Resolder FB200,FB201,
Resolder FB200,FB201,
NO NO
C225,C226 (Call) or C225,C226 (Call) or
Resolder FB200,FB201, Resolder FB200,FB201,
C223,C224 (Mp3)
C223,C224 (Mp3)
NO
Resolder FB203,R204,
NO
Resolder FB203,R204,
R218, C209,C211 or
R218, C209,C211 or
Change the U200 & U100
Change the U200 & U100
Only for training and service purposes