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LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
START
Connect the phone to network
Equipment and setup call
Setup 1KHz tone out
Does the sine wave appear
at R321, R322 ?
Change the main board
Does the sine wave appear
at Number 65, 66 pin
in the main B
’
d CN605?
Does the sine wave appear
at CN101(+) PAD in LCD FPCB?
Change the LCD FPCB
Does the Receiver get in
contact with the LCD
FPCB sus?
Re-assemble the Receiver
Can you hear sine wave
out of the receiver ?
Change the Receiver
END
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
1
2
3
4
Change the U302