LG KC780 Service Manual page 82

START
Check the soldering of
speaker and components on
FPCB
Signal TP1
Low(0V)?
No
Output Signal
TP2 is Low(0V)?
No
Receiver/Speaker
Signal TP3
High(1.6V)?
No
Replace the F-LCD
FPCB
Assemble
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Only for training and service purposes
Yes
is
Check the soldering
of U203 or replace
Yes
or replace the U206
Yes
Replace Receiver
Main PCB
Check the
soldering of U206
on the main PCB
TP1 Signal
(C242,C241)
- 83 -
5. TROUBLE SHOOTING
TP3
Receiver/Speaker Signal
(L100, L101)
TP1
TP2
Output Signal
(U206 pin 3/pin 9)
LGE Internal Use Only