LG C3600, Service Manual

Page: 26 / 51

4. TROUBLE SHOOTING
Check Flow
Start
Insert the earphone to
the phone
Dose the
audio profile of
phone change to the
earphone mode
Set the audio part of
the test equipment to
echo mode
Can you hear your voice
from the earphone?
Earphone will work
properly
Earphone detect problem
Change the earphone
and try again
1
Can you hear your voice
from the earphone?
Charge
earphone
Set the audio part
of the test
equipment to PRBS or
continuous wave mode
Can you hear your voice
from the earphone?
3
2
Audio path problem
Earphone sending path
problem
Earphone receiving path
problem
4
Yes
No
Yes
Yes
No
No
Yes
No
Earphone receiving path problem
2
Voltage at C209 ,C217
=1.2V?
Check soldering
C209,C217,R210,R228
Yes Yes
No No
Replaee
main board
Download
software
Re-solder
C209,C217,R210,R228
4
Earphone detect problem
1
Voltage at R230=0.7V?
Voltage at Pin 4 of
U200=2.4V?
Unsheathe
earphone
Voltage at pin 1 of
U200=0?
Insert earphone
Voltage at pin 4 of
U200=0
？
Voltage at pin 1 of
U200=2.8V
？
Check soldering
R201
，
R230
Replace J200
Voltage at C206=2.3V
？
Check soldering
R202
，
R204
Replace U200
Replace J200
Replace U200
Yes
Yes
Yes
Yes
Yes
No
Yes
No
No
No
No
Yes
Replace
main board
4
25