LG GB175 Service Manual page 68

Earphone
Acoustic
YES
Does waveform at
R300, R302, C300,
C302 (TP28)?
YES
Does waveform at
B300 & B301
(TP29)?
YES
Does waveform at
J600
YES
Change another Ear-Mic set
and Try again .
NO
Replace R300, R302, C300,
C302 or Change PCB
NO
Re-soldering B300 & B301 or
Change PCB
NO
Re-solder component (J600)
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