Panasonic TH-42PA20U/P 42 in. Plasma EDTV Logo

Question about Panasonic TH-42PA20U/P 42 in. Plasma EDTV

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Panasonic th-42pa20 plasma 42 inch tv

Tv wont turn on standby red light flashes and when tv is on it switches of and light flashes it then takes ages to turn on it clicks to turn on and then you hear another click and then the red light flashes again 12 blinks no picture or sound,replaced 1 cap. in scan board,still 12 bilnks,tried a spare digital board,still no go, any ideas?
thanks Phil

Posted by Anonymous on

  • 2 more comments 
  • Anonymous Mar 12, 2014

    I have a Panasonic PlasmaTV model TC-P46S1 Serial #ME92460135 Mfg Sept 2009. When I turn TV on there are 2 clicks a pause a third click and then no picture or sound but a blinking 10 code. Is the problem in the SC/Y sustain board?

  • Anonymous Mar 17, 2014

    red power light blinking, hear the tv click on and then off with no picture or sound.

  • Anonymous Mar 20, 2014

    no power, 7 blinking lights
    replaced all the boards and it still has no power, 7 blinking lights and a clicking sound

  • Anonymous Mar 24, 2014

    we turned the tv off had dinner and went to turn it on no picture and blinking light



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  • 1,894 Answers

Was that capacitor damaged?

Posted on Jan 11, 2008

  • Anonymous Jan 11, 2008

    however, I stumbled upon a PDF of a Panasonic training manual. In
    this manual lies a clue as to what the blinking means. It was written
    for older models of Plasmas, but I'm assuming the codes are the same;
    what would the point of service codes be if they changed all the time?
    Under the "Shutdown Detect Circuits" section there are lists of "SOS"
    codes. There are several blink codes from two blinks to 12 blinks all
    meaning different electronic circuit failures or problems.

    the SOUND SOS detection input monitors ofr irregularities in sound output circuit of the PA board. . A defective speaker or excessive current drain of the audio amplifier IC causes the power LED to blink 12 times.

    see page number 47... 3rd point.. that is what the problem you face exactly...

    thank you

  • Anonymous Jan 11, 2008

    while in page 42 itself you will know the cause of your problem.. but see page 47 for more detail



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These blinks [flashes] are fault indication (Error Codes). From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit section inside it. This will make repair easy. These are called blinking codes. Make sure about the exact number of blinking of the standby/power LED, by switching On & OFF the set, for at least two times. Count it carefully. If you wish to get some details, check the site linked here. It has details about blinking codes, and fault locating procedure, to many popular brand TVs and other devices.

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