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CHECKING FLOW
START
Resolder J200
Is voltage level at R210
About 2.8v?
YES
Is JACK_DETECT
Low(about 0V)?
YES
Set the audio part of the test
equipment to PRBS or
Continuous wave mode
Can you hear
the sound from
the earphone?
YES
Set the audio part of the test
Equipment to echo mode
Can you hear your
voice from
the earphone?
Earphone will work properly
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
NO
Resolder R203
NO
Change the earphone
(Headset mic)
NO
Change the earphone
(Headset mic)
and try again
NO
Change the earphone
(Headset mic)
and try again
- 63 -
4. TROUBLE SHOOTING
NO
Can you hear
the sound from
the earphone?
YES
NO
Can you hear your
voice from
the earphone?
YES
Resolder
FB201, C216, FB100
Or Change the U104
Resolder FB200,
C200,C206, R203,R201
Or Change the U104
LGE Internal Use Only
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