LG MG370 Service Manual page 62

CHECKING FLOW
START
Does the audio
profile of the phone
change to the
earphone mode?
Yes
Mic
Go to MIC
Trouble section
Check the signal Level at
AUX_MIC.
Is it about 1.2~1.5V DC with a
few tens mV AC?
Change another Ear-Mic set and Try again
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Only for training and service purposes
No
Check the voltage Level
CN201ís 8pin = Low?
Re-solder causal
No
component
(CN201)
Yes
Change another Ear-Mic set and Try again
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4. TROUBLE SHOOTING
No
Re-solder CN201 or Change
another Ear- Mic set and Try again
Yes
Replace U103 or Change Board
Earphone
Acoustic
No
Does waveform at
U102.EPPA1
fluctuate?
Yes
No
Does waveform at
CN201ís 4 and 5pin
fluctuate?
Replace U103 or
Change the board
Re-solder causal
component
LGE Internal Use Only