Panasonic PT-56LCX70 Service Manual page 30

PT-56LCX70 / PT-61LCX70 / PT-50LCX7 / PT-56LCX7 / PT-61LCX7
No sound from built-in both L-CH and
R-CH Speakers
Check that there is an audio signal to the Audio Out
Terminal from all input terminals.
Replace the OPT/TV Unit or Power P.C.B.
No sound from built-in L-CH Speaker only
Press MENU key on the remote and select
"Audio" in MENU screen. Then press "OK."
Does the "BALANCE" screen becomes center position?
Set to the center position.
Swap the Speaker Connectors to confirm the Speaker
failure.
Replace the OPT/TV Unit.
No sound from built-in R-CH Speaker only
Press MENU key on the remote and select
"Audio" in MENU screen. Then press "OK."
Does the "BALANCE" screen becomes center position?
Set to the center position.
Swap the Speaker Connectors
to confirm the Speaker failure.
Replace the OPT/TV Unit.
(All input are NG.)
(Only Audio1 OR Audio2
input is NG.)
(Only Audio3 input is NG.)
(Only Tuner input is NG.)
(Only Component 1 OR
Component 2 input is NG.)
OK
NO
Still NG
YES
NO
NO
Still NG
YES
NO
Replace the OPT/TV Unit
Replace the Rear Jack P.C.B.
Replace the Rear Jack P.C.B. or
Front Jack/Operation P.C.B.
Replace the OPT/TV Unit or
Tuner P.C.B.
Replace the Rear Jack P.C.B.
Replace the L-CH Speaker.
Replace the R-CH Speaker.
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