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50" plasma TV: TV is clicking but the screen doesn't power on

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    #1

    50" plasma TV: TV is clicking but the screen doesn't power on

    Hello there.
    I have a Samsung Plasma PS50B456B2W television. When i try to turn it on, it will just repeatedly click and nothing happens on the screen. I have replaced nearly all the capacitors with no luck. When i remove the connector between the power-board and the YSUS-board (LJ41-05905A), i can measure the correct voltage at "Vs", but when the two boards are connected the voltage jumps between 0V and 15V. Also if i remove the cable, the audio on the TV will turn on. Any suggestions? Is it the power-board or the YSUS-board or the screen that is faulty? I have attached some pictures.

    Any help will be very apreciated!!!





    UPDATE!!!
    I have detach the Y-board and i can meassure that Vs and GND is shorted. Any ideas how to fix this???
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    #2
    Re: 50" plasma TV: TV is clicking but the screen doesn't power on

    I was going to suggest checking Vs-gnd on ymain. As far as repairing the Ymain, might be easier to find a working board since this has the buffer boards integrated.

    There is a kit in the UK suggesting some clues what to look for
    http://www.ebay.com.au/itm/LJ41-0590...item2ee14f8e40

    and this comment, lease check R5085 / R5086, if there is a short across them then don't buy this kit as one or more of your buffer IC's have blown.

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      #3
      Re: 50" plasma TV: TV is clicking but the screen doesn't power on

      not real cheap for repair service

      http://www.moduslinkptstvboards.com/...01601A&x=8&y=5

      sorry, should have checked, you're not in the US
      Last edited by tw2005; 06-02-2015, 02:40 AM.

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        #4
        Re: 50" plasma TV: TV is clicking but the screen doesn't power on

        http://www.ebay.com.au/itm/BN96-0973...item4d32e41006

        always best to use advanced, manage attachments and upload to the site(max 2000x2000) that way they can be zoomed in better than the external site you used
        Last edited by tw2005; 06-02-2015, 02:45 AM.

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          #5
          Re: 50" plasma TV: TV is clicking but the screen doesn't power on

          Thank you alot for your help. I have come to the conclusion that 1 of the two power mosfets is dead (IRFP4332). A new one i my country cost 20USD. I don't know if anything else i broken, so i might just buy a new board.

          Comment

            #6
            Re: 50" plasma TV: TV is clicking but the screen doesn't power on

            Originally posted by Akoen View Post
            Thank you alot for your help. I have come to the conclusion that 1 of the two power mosfets is dead (IRFP4332). A new one i my country cost 20USD. I don't know if anything else i broken, so i might just buy a new board.
            If you are not in a hurry, you can get it from here, it takes a month to get there, more or less. Free shipping.

            Learn to fix it to improve your knowledge.

            http://www.aliexpress.com/item/IRFP4...289453497.html

            Comment

              #7
              Re: 50" plasma TV: TV is clicking but the screen doesn't power on

              Do you have a good testing method for knowing if a mosfet is dead or not? I just measured the resistance between the mid-pin (drain) and first the gate and then the source. In the bad mosfet the resistance was near 0ohm. But how the other one could still be bad, even if it isn't shorted, am i correct?

              Comment

                #8
                Re: 50" plasma TV: TV is clicking but the screen doesn't power on

                Hello. I have found a replacement board for my LJ92-01601A. The board i have found is revision AA2. My board is AA1. This shouldn't matter right?

                Comment

                  #9
                  Re: 50" plasma TV: TV is clicking but the screen doesn't power on

                  Originally posted by Akoen View Post
                  Do you have a good testing method for knowing if a mosfet is dead or not? I just measured the resistance between the mid-pin (drain) and first the gate and then the source. In the bad mosfet the resistance was near 0ohm. But how the other one could still be bad, even if it isn't shorted, am i correct?

                  https://www.youtube.com/watch?v=nqWpgeZ6J9o

                  https://www.youtube.com/watch?v=Te5YYVZiOKs

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