Microphone Trouble - LG KC560 Service Manual

5.7 Microphone trouble

Check Points
-Microphone hole
-Mic. Bias voltage level & signal line
L100 100nH
MAIN_MIC_P
L101 100nH
MAIN_MIC_N
L102 100nH
VMIC_P
27p C103
C102 27p
VMIC_N
TP2
C heck m i cr ophone sound hol e
C heck TP1
M i c bi as O N w hen cal l ?
C heck TP2
C N700 connect or i s
cor r ect ? TP3
C heck Si gnal L100,
L101? C heck TP4
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Only for training and service purposes
1
OUT
2
G1
3
G2
4
G3
5
PWR
6
G4
MIC100
SPM0204LE5-QB
C104
1u
TP4
START
Yes
Yes
Assem bl e
C136
C137 C138 1000p
22n 22n
L100 L101 L102 L103
100nH 100nH 100nH 100nH
TP1
L101
L100
No
C heck m i c. Bi as l i ne
& r epl ace Key FPC B
No
M ake r econnect i on
on C C N N 1 1 0 0 0 0
No
Repl ace m i cr ophone
( M M I I C C 1 1 0 0 0 0 )
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5. TROUBLE SHOOTING
TP3
TP4
LGE Internal Use Only