panasonic th42pv7m-7blinks

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  • willyam1
    Senior Member
    • Feb 2012
    • 112
    • israel
    #1

    panasonic th42pv7m-7blinks

    hi to all.
    this tv come on for sec and then shut with 7 blinks in a dark room can see agrey screen for sec without osd and shut -7 blinks
    SD ans SU is plug out but the same problem but when plug out the flat cabel in sc20 tv come on whith green led and no screen but not shut
    plug back the cabel in to the sc20 and shut again i understand that ther is no problem inSU and SD boards
    all put back all valltage ok befor shut
    in SC board 5v 15v vad=-105v vscn=40v vset=330v also with scop can see pulses in pin 4,5,6 in plug sc20
    shecking the board no short in the fets after all this im not sure if SC board is the the problem or the D OR POWER SUPPLY
    ALSO VSUS=190V VE IN SSBOARD IS 165V any idia befor i order a SC board
    SC BOARD IS TNPA4182
    THANKS WILLYAM
    Attached Files
    Last edited by willyam1; 06-17-2015, 04:57 AM.
    Tags: None
    • willyam1
      Senior Member
      • Feb 2012
      • 112
      • israel
      #2
      Re: panasonic th42pv7m-7blinks

      anybody?

        Comment

        • tom66
          EVs Rule
          • Apr 2011
          • 32560
          • UK
          #3
          Re: panasonic th42pv7m-7blinks

          This can in rare cases be caused by a damaged or mis-seated ribbon cable from the control board.
          Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
          For service manual, schematic, boardview (board view), datasheet, cad - use our search.

            Comment

            • willyam1
              Senior Member
              • Feb 2012
              • 112
              • israel
              #4
              Re: panasonic th42pv7m-7blinks

              thanks tomm i will check the ribbon cabel
              customer said that the tv was working and he put it on a bench for 2 years and after that he wanted to operet it and it fails the tv didnt work for 2 years?
              acording to other panasoinic plasma in most casese the problem in sc board with fet shorted i over over check no problems in all component
              i notice the the pin 4 in the ic compertor ic 871 in the circet board 2903 is not ground no to the chasis ground and not to the flouting ground but is conected to the (-) off the VAD smothing capicator do you think that i have an open in thr ground path? i didnt found a servis manual for this sc board
              thanks willyam

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