LG GT540 - Page 124

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4. Trouble Shooting
4.12.4. Microphone for main MIC
Main Microphone path as below:
MIC ¡ R508&R509 -> C504&C505 -> MSM7227
Make a call
TP1(C508) is 1.8V?
Yes
END
Change the Main board
No
Can you scoping some sound signal
at TP2(R508), TP3(R509)?
Change the MIC
START
Make some sound or voice to MIC
Yes
Can you scoping some sound
signal at TP4(C257)?
Work well?
No
No
Yes
Change the Main board
Yes