LG KG320 - Page 83

4. TROUBLE SHOOTING
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START
Does the audio
profile of the phone
change to the
earphone mode?
NO
YES
Resolder CN301
YES
Earphone will work properly
Level at
JACK_DETECT signal
is low
NO
Can you hear your
voice from
the earphone?
Set the audio part of the test
Equipment to echo mode
Change the earphone
and try again
NO
Can you hear your
voice from
the earphone?
YES
Can you hear
the sound from
the earphone?
No
Set the audio part of
the test equipment to
PRBS or continuous
wave mode
YES
Voltage level check
Of AUX_SPK_L
& AUX_SPK_R
signal.
Replace CN301
YES
NO
Voltage level check
Of AUX_MIC_P &
AUX_MIC_N
signal.
Check
U305
works properly
YES
Resoler components
No
No
Change main board
YES
YES
Resoler U305
No
Checking Flow