LG B2050 Service Manual - Page 76

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Checking Flow START Resolder J200 4 . TROUBLE SHOOTING Does the audio profile of the phone change to the earphone mode? NO Level at JACK_DETECT signal is low NO Resolder R123, R216 or Replace J200 YES YES 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? Can you hear your voice from the earphone? YES YES Earphone will work properly Can you hear the sound from the earphone? NO Voltage level check Of HEADSET_SPK_OUT_P & HEADSET_SPK_OUT_N signal YES Voltage level check Of HEADSET_MIC_P signal. YES NO NO Resolder components Check U200 & U205 works properly NO Resoler U200 & U205 YES Change main board YES - 75 -

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- 75 -
4 . TROUBLE SHOOTING
Checking Flow
START
Resolder J200
Does the audio
profile of the phone
change to the
earphone mode?
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
Can you hear
the sound from
the earphone?
Voltage level check
Of HEADSET_MIC_P
signal.
Check
U200 & U205
works properly
Voltage level check
Of HEADSET_SPK_OUT_P
& HEADSET_SPK_OUT_N
signal
Resolder components
Resoler U200 & U205
Change main board
Can you hear
your voice from
the earphone?
Can you hear
your voice from
the earphone?
Earphone will work properly
Level at
JACK_DETECT signal
is low
Resolder R123, R216
or Replace J200
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO