LG U8110 Service Manual page 120

E. Headset MIC(Voice call, Video Telephony)
START
Insert Head set.
Does t he Headset ico n
display on the main LCD?
5
Check the signal level
at R3397 at the putting
Audio signal in MIC
A few hundred of m V
7
of the signal measured
at C2612 ?
YES
Change the main B'd
Does it work p roperly ??
END
NO
YES
8
NO
NO
YES
- 121 -
4. TROUBLE SHOOTING
1
Does the level of R3397
under 0.5Volt ?
YES
YES
Change t he main B'd
Resolder C2613,
R3397 and try again.
If fail again,
Change t he m ain B' d
Try again from the start
NO
2
Does the level of R2613
over 2.0Vo lt ?
N0
4
Resolde r R2613,R3397
And try again from the start