LG KP500 Service Manual page 81

5. Trouble shooting
Check microphone sound
44pin connector
(CN501)is good?
TP1, TP2 (2.5V)?
LGE Internal Use Only
CN101
START
hole
Mic bias ON No
(2.5V)when
call? (TP3)
Yes
No
Yes
No
Check Signal
Yes
No
Check All of
CN101 solder?
Yes
Assemble
TP3
Check mic. Bias
line
Repair the 44pin
conn. (CN501)
Replace
microphone
(MIC101)
Replace KEY FPCB
Copyright © 2008 LG Electronics. Inc. All right reserved.
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TP1 TP2
CN501
Only for training and service purposes