Panasonic PT52LCX66 Service Manual - Page 30
No sound from built-in both L-CH and, R-CH Speakers, No sound from built-in L-CH Speaker only, No - remote
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PT-52LCX66 / PT-56LCX66 / PT-61LCX66 / PT-52LCX16 / PT-56LCX16 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. OK Replace the TV Unit (Base P.C.B. or Power P.C.B.). (All input are NG.) (Only Audio1 OR 2 input is NG.) Replace the TV Unit (Base P.C.B.). Replace the TV Unit (Base P.C.B.). (Only Audio3 input is NG.) Replace the TV Unit (Base P.C.B. or Front Jack/Operation P.C.B.). (Only Tuner input is NG.) Replace the TV Unit (Base P.C.B.) or Digital Tuner P.C.B. (Only HDMI input is NG.) Replace the TV Unit (Base P.C.B. or Main 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? NO Set to the center position. Still NG Swap the Speaker Connectors to confirm the Speaker failure. NO Replace the TV Unit (Base P.C.B.). YES 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? NO Set to the center position. Still NG Swap the Speaker Connectors to confirm the Speaker failure. NO Replace the TV Unit (Base P.C.B.). YES 30 Replace the L-CH Speaker. Replace the R-CH Speaker.