Table of Contents
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CHECKING FLOW
START
Does the audio
profile of the phone
ch ange to the
earphone mo de?
Yes
Mic
Go to MIC
Troub le secti on
Check t he si gnal Level
at HSMIC.
Is it about 1.2~1.5V?
Yes
Chan ge another Ear-Mi c set and Try again
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Only for training and service purposes
No
Check t he voltage Level
CN302 pi n8 = Lo w?
No
Re-solder causal
co mp on ent
(CN302)
Change anoth er Ear-Mi c set and Try again
- 61 -
4. TROUBLE SHOOTING
No
Re-solder CN302 or Change
anoth er Ear- Mic set and Try again
Yes
Replace U101 or Change B oard
Earp hone
Ac oustic
No
Does w aveform at
U101.HSOL
fluctuate?
Yes
No
Does w aveform at
CN302 pi n4,5 fluctuate?
Replace U101 or
Change the board
Re-solder causal
component
(CN302,C321 etc.)
LGE Internal Use Only
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