LG M6100 Service Manual - Page 87

Of AUX_SPK_L

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

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4. TROUBLE SHOOTING
- 88 -
START
Does the audio
profile of the phone
change to the
earphone mode?
NO
YES
Resolder CN201
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 CN201
YES
NO
Voltage level check
Of AUX_MIC_P &
AUX_MIC_N
signal.
Check
U202
works properly
YES
Resoler components
No
No
Change main board
YES
YES
Resoler U202
No
Checking Flow