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4. TROUBLESHOOTING
Checking Flow
START
Resolder CN201
Does the audio
profile of the phone
change to the
earphone mode?
YES
Set the audio part of the test
Equipment to echo mode
Can you hear your
voice from
the earphone?
YES
Earphone will work properly
NO
Level at
NO
JACK_DETECT signal
is low
YES
Change the earphone
and try again
NO
NO
Can you hear your
voice from
the earphone?
YES
- 88 -
Replace CN201
Set the audio part of
the test equipment to
PRBS or continuous
wave mode
No
Can you hear
the sound from
the earphone?
YES
No
Voltage level check
Of AUX_MIC_P &
AUX_MIC_N
signal.
YES
No
Check
U202
works properly
YES
Change main board
Voltage level check
Of AUX_SPK_L
& AUX_SPK_R
signal.
YES
No
Resoler components
Resoler U202
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