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LGE Internal Use Only
Copyright © 2007 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 ZD500,ZD501 ?
Change the main board
Does the sine wave appear
at Number 67, 69 pin
in the main Bíd CN501?
Check 629.631
Does the sine wave appear
at EAR(+) PAD in LCD FPCB?
Change the LCD FPCB
Is the soldering ot the
receiver OK?
Resolder 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