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    #1

    Samsung pn59d550c plasma

    Hi, I was watching my Samsung plasma d550 yesterday, it started making a funny noise, and smoking. I've since removed the back to find a burnt area (2 flat caps, and 1 resistor)on the power supply board. See pics. I'm going to order a new board, but want to know what caused this to happen. All other boards,wires,caps look fine. I guess what I need to know is could the x, or y, or another board have caused this? I havent removed the board to look at the back of the board to see if there's damage underneath.

    I don't want to buy a new power board only to blow it again due to another problem. I'm thinking maybe a surge caused this, but not sure, I'm a backyard electronic guy, and a tinkerer, far from a tech.
    Thanks for any help in advance.

    Scott
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    #2
    Re: Samsung pn59d550c plasma

    This kind of fault can occasionally occur, when the caps break down under load due to a manufacturing defect or progressively damaged due to power transients.

    Did the TV work when it started smoking/making a bad sound...? I'm sure you did not run it for long, but if it did not just go "bang" you might just be able to replace that cap.
    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.

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      #3
      Re: Samsung pn59d550c plasma

      I think it sorta flickered, as it happened, it happened so fast to be honest. I shut it off right away. After a few minutes I tried plugging it back in (didn't try to power it on) and it continued to smoke, so I unplugged again, and haven't plugged it back in. Other articles I've read say the ysus board may have done this. What do you think? I'm going to check the back of the PSU board tonight.
      Thanks for the reply

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        #4
        Re: Samsung pn59d550c plasma

        I think it sorta flickered, as it happened, it happened so fast to be honest. I shut it off right away. After a few minutes I tried plugging it back in (didn't try to power it on) and it continued to smoke, so I unplugged again, and haven't plugged it back in. Other articles I've read say the ysus board may have done this. What do you think? I'm going to check the back of the PSU board tonight.
        Thanks for the reply

        Comment

          #5
          Re: Samsung pn59d550c plasma

          I don't like the white goo covering the pins on that mosfet transistor near the area. I've heard of some of that becoming conductive. But I thought they were using a sew substance that doesnt become conductive.
          Did I leave the soldering iron on?

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            #6
            Re: Samsung pn59d550c plasma

            Those blue caps tie one side to ground and work as sort of a choke on the line it's connected to to filter voltage I believe.
            Did I leave the soldering iron on?

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              #7
              Re: Samsung pn59d550c plasma

              In this case the capacitors are used as a snubber across the diodes.

              OP, can you read what's printed on the capacitor itself? Should be something like "251K 1KV"
              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.

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                #8
                Re: Samsung pn59d550c plasma

                OK the disc caps are R 471k 1ku, the bottom one is badly burnt, I'm capable of changing those out if I can find them. I was just afraid something else on the board is damaged, that caused this, not just a surge. Thanks for all the help

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                  #9
                  Re: Samsung pn59d550c plasma

                  Ok, 470pF 1kV. Here:
                  http://www.digikey.com/product-detai...108-ND/1021058

                  +$3 shipping

                  I'd replace all similar caps in same area
                  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

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