Only For Training And Service Purposes - LG GD580 Service Manual

Connect the phone to network
Equipment and setup call
Does the sine wave appear
1
at C467(TP1),C466(TP2)?
Does the sine wave appear
1
at C470(TP3), C469(TP4) ?
Does the sine wave appear
2
at EAR(+) PAD(TP5) in Upper FPCB?
2
3
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Only for training and service purposes

START
Setup 1KHz tone out
YES
YES
YES
Is the soldering of the
speaker OK?
YES
Can you hear sine wave
out of a speaker ?
YES
END
NO
Change the main board
The sine wave not appear
NO
Change the U405
NO
Change the KEY FPCB
NO
Resolder the Speaker
NO
Change each Speaker
- 105 -
4. Trouble Shooting
LGE Internal Use Only