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50" Samsung Plasma HP-T5054X/XAA won't power up and clicks

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    50" Samsung Plasma HP-T5054X/XAA won't power up and clicks

    I have a 50" Samsung Plasma TV, Model HP-T5054X/XAA that won't power up. When I plug in the power cable there is a clicking noise that goes for a couple of seconds, then stops, and then starts clicking again.

    I first looked online and saw something about a bad power board, so I bought a tested one online and put it in...no change.

    We then had a Samsung Repair Tech over to look at an LCD we were having problems with and he was nice enough to look at this Plasma and quickly pointed to a bad chip on the upper Y-Buffer Board. So I got refurbished Y-Buffer Boards (upper and lower) and replace the old ones...no change

    I was going to sell this this for parts even though I really want it working. When I listed it, at least one person said after reading what I had already done that 90% of the 5054s with problems had the same issue but he wouldn't tell me what it was since he wanted to buy the TV off me for much less than I listed it and then fix it himself.

    So I am back to my research on what could be the issue. Here is what I've read as possible issues:
    1) The Y Board that the Y Buffer Boards attached two might need to be replaced since there was a bad upper Y buffer. I took the Y board off and saw no burns or bad caps.
    2) Someone suggested I replace the main board as they had a different model and that how they fixed it. I took the main board off and saw no burns or bad caps.
    3) I read one post that said the button board on this model was often tightened too much in the factory and could be cracked, causing problems.

    I feel like this thing is turning into a money pit but I'd still really like to fix it without spending almost the same as a new TV. Any help based on seeing this on the same model multiple times would be appreciated. Thanks.
    Attached Files

    #2
    Re: 50" Samsung Plasma HP-T5054X/XAA won't power up and clicks

    I have repaired a similar chassis, 42" version though; it had that same bad cap, but the main issue was a failed X-main board. This is NOT the same as the main board; it's the board opposite the Y-buffer/Y-main. Mine would click, blink the LED, click, blink and repeat, every few seconds.
    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


      #3
      Re: 50" Samsung Plasma HP-T5054X/XAA won't power up and clicks

      @tom66 - No bad caps found to date. I just took off the x-main board and it looks fine too! So frustrating when all of the boards look good but changing them all would be for the price of a new LED LCD!!!

      Comment


        #4
        Re: 50" Samsung Plasma HP-T5054X/XAA won't power up and clicks

        Since you had a blown IC on the buffers I would be suspicious of the Y-Main. If you unplug the Y-Main, does the TV come on?
        (You can disconnect (powered off) the X-Main too if it still clicks)

        Comment


          #5
          Re: 50" Samsung Plasma HP-T5054X/XAA won't power up and clicks

          Yeah I know how you feel :p. I'm working on almost the same plasma TV, HP-T5044X/XAA (guessing an older version)

          Just waiting for my buffer boards to get delivered.

          If you found a burnt chip on your buffer boards, try checking the FETs on the Y-main.
          I had some good buffer boards but the Y-main prevented it from turning on. (The FETs didn't have to look burnt to be shorted)
          Last edited by tieny; 12-21-2012, 08:53 PM.

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            #6
            Re: 50" Samsung Plasma HP-T5054X/XAA won't power up and clicks

            Just tried the suggestion from drpj23 to disconnect the y-main board and I believe that did it!!! Instead of the clicking it made a little do-do-do-do chime that sounded a lot like it was happy (or trying to turn on). Next step, new Y-main board...hoping I didn't mess up the refurbished Y-buffers since I had attached them to the Y-main that was bad. I think I saw an offer to fix all three for $79 on eBay I may try...

            Thanks to all for your suggestions. I'll update status once I get a new or refurbished Y-main board...unless you have suggestions on where to get for a good price.

            Thanks again.

            Comment


              #7
              Re: 50" Samsung Plasma HP-T5054X/XAA won't power up and clicks

              the y-sus board mosfet's on the lower heat sink, if i remember right marked toshiba 2837 & 88n30w shorted were what i found on 2 of these sets along with buffers

              Comment


                #8
                Re: 50" Samsung Plasma HP-T5054X/XAA won't power up and clicks

                Got a refurbished Y-Main and TV seems to be working fine!! Paid $80 for the board on eBay.

                Comment


                  #9
                  Re: 50" Samsung Plasma HP-T5054X/XAA won't power up and clicks

                  Thanks for repair feedback.
                  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


                    #10
                    Re: 50" Samsung Plasma HP-T5054X/XAA won't power up and clicks

                    I ran across this model yesterday. One of the transformers on the upper-y board looks burnt. Not surprising since it was mounted on the wall of a gambling establishment/bar for years (smoking allowed).

                    Here's a crappy pic if anyone is interested.
                    Attached Files

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