LG L1150 Service Manual page 63

4. TROUBLE SHOOTING
MICP
MICN
START
Test : Baseband Audio Gain
Loopback Test ON
Conne
and setup call.
No
The voltage of R214
is 2.0V?
Check the signal level at pin 1,2 of the MIC
after putting audio signal into the MIC.
A few hundreds of mV
of signals are measured?
Yes
The MIC is out of order.
Change the MIC.
The waveforms at MICP and MICN
Yes
OK
ct the handset to network equipment
No
No
The soldering of R214 is OK?
Yes
ABB is out of order.
Change the board.
Yes
The soldering of R217,
R219, R222, C220,
and C224 is OK?
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AC voltages of the signals
No
Resolder the R214.
No
Resolder the R217,
R219, R222,
C222 and C224.