LG LG9200 Service Manual page 48

Speaker/Receiver Trouble (4)
1. Receiver Trouble
START
Set audio pa rt at test equipment
as PRBS or continuous wave, not echo.
Set the audio vo lu me max.
Does sin e wave appear
at R291, R292?
Yes
SPK_EN signal is low ?
Yes
Conne ction be twe en
FPCB and boa rd is OK?
No ABB is out of orde r.
Change the boa rd.
No
Re-solder t he U202.
Otherw ise ch ange it .
No
Reco nnect the FPCB.
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4. TROUBLE SHOOTING
Receiv er i s out of ord er.
Change th e Receiver.
Yes
Solde ring of
Receiver is O K?
Yes
FPCB is OK?
Yes
Sold erin g of CN301,CN901
is O K?
Yes
No Reso ld er
the Receiver.
No
Replace t he FPCB
No Re-solde r the
CN301,CN901.