Headset Mic - LG U400 Service Manual

4.11.5. Headset MIC(Voice call, Video Telephony )
START
Insert Headset.
Does the Headset icon display
on the main LCD?
5
Check the signal level
at R603 at the putting
Audio signal in MIC
A few hundred of mV
of the signal
8
at C603 ?
Change the main Bíd
Does it work properly ??
END
NO
YES
Change the main B,d
9
NO
measured
YES
NO
YES
- 123 -
4. TROUBLE SHOOTING
1
Does the level of R605
under 0.5Volt ?
YES
YES
4
Resolder C603
and try again.
If fail again,
Change the main Bíd
Try again from the start
NO
2
Does the level of R603
over 2.0Volt ?
N0
Resolder R605,R603
And try again from the start