LG GD310 Service Manual page 79

5. TROUBLE SHOOTING
LGE Internal Use Only
START
Check microphone sound
hole
Mic bias ON
(2.5V)when
call?(C318)
Yes
30pin connector
(CN302)is good?
Yes
Check Signal C312,
C319 (2.5V)
Assemble
- 80 -
No
Check mic. Bias line
No
Repair the 30pin
conn. (CN302)
No
Replace
microphone
(MIC100)
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