LG KG270 Service Manual - Page 69
MIC_P= about 1.2~1.5V DC
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4. TROUBLE SHOOTING Checking Flow Make a call R300.VMIC=2.5V Check voltage level NO of R300 YES Replace PCB Check component NG Re-solder or status around MIC replace the Component OK NG Check status of MIC Re-solder or replace Microphone OK Check the voltage Level NG of MIC_P MIC_P= about 1.2~1.5V DC with a few tens mV OK Replace PCB Change Microphone - 70 -
4. TROUBLE SHOOTING
- 70 -
Replace PCB
Check the voltage Level
of MIC_P
Check voltage level
of R300
Change Microphone
Check component
status around MIC
Re-solder or
replace the Component
Check status of MIC
Re-solder or
replace Microphone
YES
NO
OK
OK
NG
NG
MIC_P= about 1.2~1.5V DC
with a few tens mV
NG
Replace PCB
OK
R300.VMIC=2.5V
Make a call
Checking Flow