LG -A120 Service Manual page 72

4.12.3 Checking Flow
Does the audio profile
of the phone change to
the earphone mode ?
YES
Earphone
Acoustic
Does waveform at
TP1&TP2 fluctuate ?
YES
Does waveform at
TP3&TP4 fluctuate ?
YES
Change another Ear-Mic set and
Try again.
Start
NO
NO
NO
Check U201 and component status
around U201
72
Replace U600 or Change the
PCB .