LG KF750 Service Manual page 118

START
Check the MIC bias level
at the C104
Is the level of CCO1
1
2.4Volt ?
Change the MIC
No
Does it work properly ?
END
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Only for training and service purposes
2
No
at C106, C108 at the putting
Yes
YES
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4. TROUBLE SHOOTING
Check the signal level
Audio signal in MIC
Yes
No
A few hundred of mV
of the signal measured ?
Yes
Change the main B,d
3
Resolder C106, C108
and try again.
If fail again,
chage the main Bíd
LGE Internal Use Only