LG KP175 - Page 68

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4. TROUBLE SHOOTING
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START
Is JACK_DETECT
High(2.8V)?
NO
YES
Resolder CN202
YE
S
Earphone will work properly
Can you hear your
voice from
the earphone?
Set the audio part of the test
Equipment to echo mod
e
Change the earphone
and try again
NO
Can you hear
the sound from
the earphone?
Set the audio part of the test
equipment to PRBS or
Continuous wave mod
e
YE
S
YES
Resolder R2181, R222
Is voltage level at R218
About 2.5v
?
Change the U102
NO
YE
S
Can you hear
the sound from
the earphone?
NO
Change the earphone
and try again
NO
Can you hear your
voice from
the earphone
?
NO
Resolder FB802, C233
Or Change the U102
Resolder R227,C226
Or Change the U102
CHECKING FLOW