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Samsung UN40EH5000F shutting down randomly I might have repaired time will tell

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    #1

    Samsung UN40EH5000F shutting down randomly I might have repaired time will tell

    My son friend has this tv and the issue with is it turns off randomly for no reason ( this is what was reported to me about what the issue is )

    Well I took off the back cover removed the switching power supply board and checked all of the 47uf@50 volt capacitor they all seem to have an ESR value of 0.24 and a new one has a value of 0.47 which to seem odd that all have values less than a new one has i replaced all four of them

    But this is not all I found

    First —>one of the switching power supply transformer pins had flux all over one of the pins so I heated it and even more flux came out of the soldering joint

    But this was not the only thing I found

    Second—>Two of power diodes all the pins had flux residue all over them and the same thing with these soldering joints more flux coming out from the soldering joints

    Really product quality control are real shit

    So far it has been running for about an hour now so let see what happens next
    Last edited by SMDFlea; 11-21-2021, 06:53 AM. Reason: UN40EH5000F
    9 PC LCD Monitor
    6 LCD Flat Screen TV
    30 Desk Top Switching Power Supply
    10 Battery Charger Switching Power Supply for Power Tool
    6 18v Lithium Battery Power Boards for Tool Battery Packs
    1 XBox 360 Switching Power Supply and M Board
    25 Servo Drives 220/460 3 Phase
    6 De-soldering Station Switching Power Supply 1 Power Supply
    1 Dell Mother Board
    15 Computer Power Supply
    1 HP Printer Supply & Control Board * lighting finished it *


    These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

    1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
    2 Hem Saw Computer Stack Board

    All of these had CAPs POOF
    All of the mosfet that are taken out by bad caps
    Tags: None
    #2
    Re: Samsung LCD tv shutting down randomly I might have repaired time will tell me tru

    Sounds similar to one of my nt5b01 repairs. Only way to fix it was to take the inductor out clean the hole and resolder plus clean.

    Comment

      #3
      Re: Samsung LCD tv shutting down randomly I might have repaired time will tell me tru

      I ran it for 8 hours and it stayed on until I shut it off to come to work

      I run it again when I get back home until I have to go to work
      Last edited by sam_sam_sam; 11-15-2021, 01:22 AM.
      9 PC LCD Monitor
      6 LCD Flat Screen TV
      30 Desk Top Switching Power Supply
      10 Battery Charger Switching Power Supply for Power Tool
      6 18v Lithium Battery Power Boards for Tool Battery Packs
      1 XBox 360 Switching Power Supply and M Board
      25 Servo Drives 220/460 3 Phase
      6 De-soldering Station Switching Power Supply 1 Power Supply
      1 Dell Mother Board
      15 Computer Power Supply
      1 HP Printer Supply & Control Board * lighting finished it *


      These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

      1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
      2 Hem Saw Computer Stack Board

      All of these had CAPs POOF
      All of the mosfet that are taken out by bad caps

      Comment

        #4
        Re: Samsung LCD tv shutting down randomly I might have repaired time will tell me tru

        the discussion is useless without tv model.

        Comment

          #5
          Re: Samsung LCD tv shutting down randomly I might have repaired time will tell me tru

          Originally posted by Davi.p View Post
          the discussion is useless without tv model.
          This will be coming shortly tv model number

          Because I have the TV set laying flat on the dining room table the cover is not screwed back together yet this is the reason I have not posted this information yet ( the stand is part of the cover on this TV set )

          An update

          This TV set has been running for two different days for over 8 hours each time and so far has not shut down

          So as far as I am concerned the issue has been resolved

          I will take some pictures of both sides the board in question and point to each of the issues that I found these pictures are after it was repaired unfortunately I did not take pictures of it before I started the repairs because I was not completely aware of all of the issue with this TV set when my son first brought it home to me to look at it
          Last edited by sam_sam_sam; 11-15-2021, 07:08 PM.
          9 PC LCD Monitor
          6 LCD Flat Screen TV
          30 Desk Top Switching Power Supply
          10 Battery Charger Switching Power Supply for Power Tool
          6 18v Lithium Battery Power Boards for Tool Battery Packs
          1 XBox 360 Switching Power Supply and M Board
          25 Servo Drives 220/460 3 Phase
          6 De-soldering Station Switching Power Supply 1 Power Supply
          1 Dell Mother Board
          15 Computer Power Supply
          1 HP Printer Supply & Control Board * lighting finished it *


          These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

          1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
          2 Hem Saw Computer Stack Board

          All of these had CAPs POOF
          All of the mosfet that are taken out by bad caps

          Comment

            #6
            Re: Samsung LCD tv shutting down randomly I might have repaired time will tell me tru

            Perfect! I’d say case closed!

            Comment

              #7
              Re: Samsung LCD tv shutting down randomly I might have repaired time will tell me tru

              Originally posted by Davi.p View Post
              the discussion is useless without tv model.
              Here is the information that you requested
              Attached Files
              Last edited by sam_sam_sam; 11-19-2021, 08:54 AM.
              9 PC LCD Monitor
              6 LCD Flat Screen TV
              30 Desk Top Switching Power Supply
              10 Battery Charger Switching Power Supply for Power Tool
              6 18v Lithium Battery Power Boards for Tool Battery Packs
              1 XBox 360 Switching Power Supply and M Board
              25 Servo Drives 220/460 3 Phase
              6 De-soldering Station Switching Power Supply 1 Power Supply
              1 Dell Mother Board
              15 Computer Power Supply
              1 HP Printer Supply & Control Board * lighting finished it *


              These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

              1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
              2 Hem Saw Computer Stack Board

              All of these had CAPs POOF
              All of the mosfet that are taken out by bad caps

              Comment

                #8
                Re: Samsung LCD tv shutting down randomly I might have repaired time will tell me tru

                Here are some pictures of this switching power supply board section of this tv

                It still has a good picture on the screen forensics files on Pluto TV channel internet streaming

                I have also ran it for over 24 hours in one session so it seems to be fixed correctly

                One note the other capacitors were not replaced because they seem to within reason for there ESR value for the UF value of the capacitor in question plus I did not have those capacitors in my stock pile on hand
                Attached Files
                Last edited by sam_sam_sam; 11-19-2021, 09:13 AM.
                9 PC LCD Monitor
                6 LCD Flat Screen TV
                30 Desk Top Switching Power Supply
                10 Battery Charger Switching Power Supply for Power Tool
                6 18v Lithium Battery Power Boards for Tool Battery Packs
                1 XBox 360 Switching Power Supply and M Board
                25 Servo Drives 220/460 3 Phase
                6 De-soldering Station Switching Power Supply 1 Power Supply
                1 Dell Mother Board
                15 Computer Power Supply
                1 HP Printer Supply & Control Board * lighting finished it *


                These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

                1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
                2 Hem Saw Computer Stack Board

                All of these had CAPs POOF
                All of the mosfet that are taken out by bad caps

                Comment

                  #9
                  Re: Samsung LCD tv shutting down randomly I might have repaired time will tell me tru

                  removed
                  Last edited by Davi.p; 11-19-2021, 09:31 AM.

                  Comment

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