Only For Training And Service Purposes - LG AT&T GR500 Service Manual

4. TROUBLE SHOOTING
TP1
TP2
TP3
TP4
LGE Internal Use Only
START
Connect the phone to the network
Equipment and set it for 1KHz tone out
Does sine waves appear
at R700, R701?
YES
Does sine waves appear
at Number 1, 2 pin
in the main B'd CN700?
YES
Does sine waves appear
at EAR(+) PAD in LCD FPCB?
YES
Does the Receiver get in
contact with the LCD
FPCB.
YES
Can you hear 1KHz tone
from the receiver ?
YES
END
NO
Change the main board
NO
Change the main board
NO
Change the LCD FPCB
NO
Re-assemble the Receiver
NO
Change the Receiver
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Only for training and service purposes