LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
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START
Does the audio
profile of the phone
ch ange to the
earphone mo de?
Check t he voltage Lev el
CN302 pi n8 = Lo w?
Replace U101 or Change B oard
Re-solder CN302 or Change
anoth er Ear- Mic set and Try again
Mic
Earp hone
Go to MIC
Troub le secti on
Re-solder causal
co mp on ent
(CN302)
Check t he si gnal Lev el
at HSMIC.
Is it abo ut 1.2~1.5V?
Chan ge another Ear-Mi c set and Try again
Ac oustic
Does w aveform at
U101.HSOL
fluctuate?
Replace U101 or
Change the board
Does w aveform at
CN302 pi n4,5 fluctuate?
Re-solder causal
component
(CN302,C321 etc.)
Change anoth er Ear-Mi c set and Try again
Yes
Yes
Yes
Yes
No
No
No
No
No
CHECKING FLOW