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Samsung UN55H6203AFXZA scorched part on PS board.

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    #1

    Samsung UN55H6203AFXZA scorched part on PS board.

    Hi guys, I picked up this tv today and the owner said the tv had sound but no picture. Upon getting home I immediately proceeded to open up the back without plugging the tv in to see what it does and I found the PS has a pretty big part that is scorched and underneath (bottom of PS) is what I wanna say is a voltage regulator? Don't really know... but anyway what do you guys think happened to it and can I take another one of those from another PS and pop it in or do I buy a replacement from digikey?
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    #2
    Re: Samsung UN55H6203AFXZA scorched part on PS board.

    Also wanna mention that the PS has a bunch of questionable/ suspect solder joints...

    Comment

      #3
      Re: Samsung UN55H6203AFXZA scorched part on PS board.

      That is PWM Controlled power MOSFET and the LED backlights return line for the LED string. You may have some shorted out LEDs so the MOSFET runs hot.
      Do you have LED tester?
      Never stop learning
      Basic LCD TV and Monitor troubleshooting guides.
      http://www.badcaps.net/forum/showthr...956#post305956

      Voltage Regulator (LDO) testing:
      http://www.badcaps.net/forum/showthr...999#post300999

      Inverter testing using old CFL:
      http://www.badcaps.net/forum/showthr...er+testing+cfl

      Tear down pictures : Hit the ">" Show Albums and stories" on the left side
      http://s807.photobucket.com/user/budm/library/

      TV Factory reset codes listing:
      http://www.badcaps.net/forum/showthread.php?t=24809

      Comment

        #4
        Re: Samsung UN55H6203AFXZA scorched part on PS board.

        Hey budm thanks for your reply, as far as an LED tester unfortunately I don't have one. Is my next step taking the TV apart and get to the LED's?

        Comment

          #5
          Re: Samsung UN55H6203AFXZA scorched part on PS board.

          Taking apart the 55" panel is the last thing you will want to do.
          It is better in invest on a LED tester to at least test the LED string to see what result you will see.
          Can you still read the P/N as printed on that MOSFET?
          Never stop learning
          Basic LCD TV and Monitor troubleshooting guides.
          http://www.badcaps.net/forum/showthr...956#post305956

          Voltage Regulator (LDO) testing:
          http://www.badcaps.net/forum/showthr...999#post300999

          Inverter testing using old CFL:
          http://www.badcaps.net/forum/showthr...er+testing+cfl

          Tear down pictures : Hit the ">" Show Albums and stories" on the left side
          http://s807.photobucket.com/user/budm/library/

          TV Factory reset codes listing:
          http://www.badcaps.net/forum/showthread.php?t=24809

          Comment

            #6
            Re: Samsung UN55H6203AFXZA scorched part on PS board.

            I ordered this LED tester... should be here tomorrow, what do you think? https://www.amazon.com/SID-LED-Multi...&rps=1&sr=8-12

            Comment

              #7
              Re: Samsung UN55H6203AFXZA scorched part on PS board.

              Also mosfet reads D5N40 GA4H18...

              Comment

                #8
                Re: Samsung UN55H6203AFXZA scorched part on PS board.

                https://www.mouser.com/Search/Refine?Keyword=D5N40
                You may have to get it from EBAY since it is obsoleted part.
                Never stop learning
                Basic LCD TV and Monitor troubleshooting guides.
                http://www.badcaps.net/forum/showthr...956#post305956

                Voltage Regulator (LDO) testing:
                http://www.badcaps.net/forum/showthr...999#post300999

                Inverter testing using old CFL:
                http://www.badcaps.net/forum/showthr...er+testing+cfl

                Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                http://s807.photobucket.com/user/budm/library/

                TV Factory reset codes listing:
                http://www.badcaps.net/forum/showthread.php?t=24809

                Comment

                  #9
                  Re: Samsung UN55H6203AFXZA scorched part on PS board.

                  Hey Budm... So I finally got the LED tester and I gave it a shot! Turns out the very top strip was shorted and on my weak ass attempt on getting down to the LED strips so that I could get a part number and order them I accidently cracked the damn panel on one of the bottom corners! I felt so damn bad... still do. Dammit!

                  Comment

                    #10
                    Re: Samsung UN55H6203AFXZA scorched part on PS board.

                    Here's a picture so you can see my stupidity!
                    Attached Files

                    Comment

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