Panasonic PT56DLX75 - 56" DLP TV, Manual, Page: 105 / 107

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No sound from both L-CH and R-CH
built-in Speakers
Replace the TV Unit
(Base C.B.A. (Circuit Board A)).
(All inputs are NG.)
Check that there is an audio signal to the Audio Out
Terminal from all input terminals.
No sound from built-in L-CH Speaker only
Press "MENU" button on the remote and select
"SOUND" in MENU screen. Then press "OK."
Replace the L-CH Speaker.
Verify that the "BALANCE" is in the center position.
Set to the center position.
Swap the Speaker Connectors
to confirm the Speaker failure.
Replace the TV Unit (Base C.B.A. (Circuit Board A))
NO
Still NG
NO
YES
Replace the R-CH Speaker.
Verify that the "BALANCE" is in the center position.
Set to the center position.
Swap the Speaker Connectors
to confirm the Speaker failure.
Replace the TV Unit (Base C.B.A. (Circuit Board A))
NO
Still NG
NO
YES
No sound from built-in R-CH Speaker only
Press "MENU" button on the remote and select
"SOUND" in MENU screen. Then press "OK."
(Only Audio1, 2,
OR 4 input is NG.)
(Only Tuner input is NG.)
(Only Audio3 input is NG.)
OK
Replace the TV Unit (Base C.B.A. (Circuit Board A)
or Power C.B.A. (Circuit Board P)).
Replace the TV Unit
(Base C.B.A. (Circuit Board A) or
Front Jack C.B.A. (Circuit Board FJ)).
Replace the TV Unit
(Base C.B.A. (Circuit Board A)) or
Digital Tuner C.B.A. (Circuit Board DT).
Replace the TV Unit
(Base C.B.A. (Circuit Board A)
or Rear Jack C.B.A.).