LG KG270 Service Manual - Page 80
Check I2C signal and 32K clock
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4. TROUBLE SHOOTING Checking Flow Connector Headset and Turn on Radio and tuned channel U304.PIN1 = High U304.PIN4=2.8V R336/R337/338 Check I2C signal and 32K clock R329/R330 C332/C333 R327/R331 Check LDO NO Power YES Check NG Control Signal OK Check NG Audio Output Of Transceiver OK Check NG Audio Output Of Amplifier OK Change PCB Change U304 Change PCB Change U302 Change U303 - 81 -
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4. TROUBLE SHOOTING
- 81 -
Connector Headset and
Turn on Radio and
tuned channel
Check LDO
Power
U304.PIN1 = High
U304.PIN4=2.8V
Check
Control Signal
R336/R337/338
Check I2C signal and 32K clock
Check
Audio Output
Of Transceiver
R329/R330
C332/C333
Check
Audio Output
Of Amplifier
R327/R331
Change PCB
Change U304
Change PCB
Change U302
Change U303
NO
NG
NG
NG
YES
OK
OK
OK
Checking Flow