Only For Training And Service Purposes - LG GT500 Service Manual

4. TROUBLE SHOOTING
1
2
3
3
LGE Internal Use Only
START
Connect the phone to network
Equipment and setup call.
Setup 1KHz tone out.
Does the sine wave appear
at TP1, TP2 ?
YES
Does the sine wave appear
at Number TP3, TP4
in the main B'd CN503?
YES
Does the sine wave appear
at EAR(+) PAD(TP5) in LCD FPCB?
YES
Is the soldering of the
receiver OK?
YES
Can you hear sine wave
out of the receiver ?
YES
END
NO
Change the main board
NO
Change U301
NO
Change the Camera FPCB
NO
Resolder the Receiver
NO
Change the Receiver
- 94 - Copyright © 2009 LG Electronics. Inc. All right reserved.
The sine wave not appear

Only for training and service purposes