LG 410G Service Manual page 55

4. TROUBLE SHOOTING
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
HSMIC.
Is it about 1.2~1.5V?
Yes
Change another Ear-Mic set and Try again
LGE Internal Use Only
No
Check the voltage Level
CN302 pin8 = Low?
No Re-solder causal
component
(CN302)
Change another Ear-Mic set and Try again
-52-
- 56 -
No
Re-solder CN302 or Change
another Ear- Mic set and Try again
Yes
Replace U101 or Change Board
Earphone
Acoustic
No
Does waveform at
U101.HSOL
fluctuate?
Yes
No
Does waveform at
CN302 pin4,5 fluctuate?
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Replace U101 or
Change the board
Re-solder causal
component
(CN302,C321 etc.)