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LGE Internal Use Only Copyright © 2009 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 TP1, TP2 ?
Change the main board
Does the sine wave appear
at Number TP3, TP4
in the main B’d CN503?
Change U301
Does the sine wave appear
at EAR(+) PAD(TP5) in LCD FPCB?
Change the Camera FPCB
Is the soldering of the
receiver OK?
Resolder 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
3
The sine wave not appear
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