Panasonic PT-43LCX64 Service Manual page 78

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 Audio Amp C.B.A. Still NG, Replace the Rear Jack C.B.A. Still NG, Replace the Power C.B.A.
No sound from built-in L-CH Speaker only
Press "MENU" button on the remote and select
"Audio" in MENU screen. Then press "OK."
Does the "BALANCE" screen becomes center position?
Replace the L-CH Speaker.
No sound from built-in R-CH Speaker only
Press "MENU" button on the remote and select
"Audio" in MENU screen. Then press "OK."
Does the "BALANCE" becomes center position?
Replace the R-CH Speaker.
OK
YES
YES
(All input are NG.)
(Only Audio1, 2, Component
1, 2, OR 3 input is NG.)
(Only Audio3 input is NG.)
(Only Tuner input is NG.)
(Only RGB 1 input is NG.)
(Only RGB 2 input is NG.)
(Only HDMI input is NG.)
NO
NO
Replace the Rear Jack C.B.A.
Replace the Rear Jack C.B.A.
Replace the Front Jack C.B.A. Still
NG, replace the Rear Jack C.B.A.
Replace the Tuner C.B.A. Still NG,
replace the Rear Jack C.B.A.
Replace the Main C.B.A.
Replace the Front Jack C.B.A. Still
NG, replace the Main C.B.A.
Replace the Main C.B.A.
Set to the center position.
Set to the center position.