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CHECKING FLOW
START
Resolder CN202
Is voltage level at R218
About 2.5v?
YES
Is JACK_DETECT
High(2.8V)?
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
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Only for training and service purposes
NO
Resolder R2181, R222
NO
Change the U102
NO
Change the earphone
and try again
NO
Change the earphone
and try again
- 69 -
4. TROUBLE SHOOTING
Can you hear
NO
the sound from
the earphone?
YES
NO
Can you hear your
voice from
the earphone?
YES
Resolder FB802, C233
Or Change the U102
Resolder R227,C226
Or Change the U102
LGE Internal Use Only
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