Panasonic PT-56DLX25 Service Manual page 61

No sound from both L-CH and R-CH
built-in Speakers
Check that there is an audio signal to the Audio Out
Terminal from all input terminals.
OK
Replace the TV Unit (Base C.B.A. (Circuit Board A)
or Power C.B.A. (Circuit Board P)).
No sound from built-in L-CH Speaker only
Press "MENU" button on the remote and select
"SOUND" in MENU screen. Then press "OK."
Verify that the "BALANCE" is in the center position.
NO
Set to the center position.
Still NG
Swap the Speaker Connectors
to confirm the Speaker failure.
NO
Replace the TV Unit (Base C.B.A. (Circuit Board A))
No sound from built-in R-CH Speaker only
Press "MENU" button on the remote and select
"SOUND" in MENU screen. Then press "OK."
Verify that the "BALANCE" is in the center position.
NO
Set to the center position.
Still NG
Swap the Speaker Connectors
to confirm the Speaker failure.
NO
Replace the TV Unit (Base C.B.A. (Circuit Board A))
(All inputs are NG.)
Replace the TV Unit
(Base C.B.A. (Circuit Board A)).
(Only Audio1, 2,
Replace the TV Unit
OR 4 input is NG.)
(Base C.B.A. (Circuit Board A)
or Rear Jack C.B.A.).
Replace the TV Unit
(Only Audio3 input is NG.)
(Base C.B.A. (Circuit Board A) or
Front Jack C.B.A. (Circuit Board FJ)).
Replace the TV Unit
(Only Tuner input is NG.)
(Base C.B.A. (Circuit Board A)) or
Digital Tuner C.B.A. (Circuit Board DT).
YES
Replace the L-CH Speaker.
YES
Replace the R-CH Speaker.
59
PT-56DLX75 / PT-61DLX75