LG KT520 Service Manual page 100

Connect the phone to network
Equipment and setup call.
Setup 1KHz tone out.
Does the sine wave appear
1
Does the sine wave appear
2
in the main Bíd CN503?
Does the sine wave appear
3
at EAR(+) PAD in LCD FPCB?
Is the soldering of the
3
receiver OK?
Can you hear sine wave
out of the receiver ?
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Only for training and service purposes
START
at R618, R621 ?
YES
at Number 2, 4 pin
YES
YES
YES
YES
END
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4. TROUBLE SHOOTING
NO
Change the main board
The sine wave not appear
NO
Change U601
NO
Change the LCD FPCB
NO
Resolder the Receiver
NO
Change the Receiver
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