Mic Trouble - LG -600 Service Manual

5.2.2 MIC Trouble

MIC is not working
Connect the Phone to
Network Analyzer
Check the signal level at the
point U501, (F610 = MIC_bias)
The level is 2.5V
Check the signal level at the
U900, PIN 5,6 and U901, P5,6
after putting audio signal in MIC
A few hundreds
of mV of signal levels
are measured
Check the MIC
YES
YES
END
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5. Data Kit & Test Method
NO
Check the connectivity of
F610 and R614, R616.
NO
Replace the U900 or
U901 which does not
have proper level