LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
- 76 -
CHECKING FLOW
START
Does the audio
profile of the phone
change to the
earphone mode?
Check the voltage Level
TP1(CN301.8) = Low?
Replace U103 or Change Board
Re-solder CN301 or Change
another Ear- Mic set and Try again
Mic
Earphone
Re-solder causal
component
(CN301)
Check the signal Level
at HS_MIC.
Is it about 1.2~1.5V DC
with a few tens mV AC?
Replace U103 or
Change another Ear-Mic set and Try again
Acoustic
Does waveform at
TP6 and TP7 (CN301.4,5)
fluctuate?
Re-solder causal
component
(CN301,C308,.etc.)
Change another Ear-Mic set and Try again
Yes
Yes
Yes
Yes
No
No
No
No
Does waveform at
TP4 and TP5 fluctuate?
No
Check voltage level
of TP2
Check U103
No
Check component status
around Vmic
Re-solder or
replace the Component
No
Does waveform at
TP3 (U103.HS_REC)
fluctuate?
Replace U103 or
Change the board
No
Check U201 and
component status
around
U201
Содержание KP105
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