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    please help identify this component

    have been trying to work this out ..
    i am thinking its a LM339PT ?
    14 pin one ..zoom in to read it ..
    Attached Files

    #2
    Re: please help identify this component

    looks like 339
    makes sense, isnt 339 a comparater?

    Comment


      #3
      Re: please help identify this component

      its marked ezdd 339 mrc013

      Comment


        #4
        Re: please help identify this component

        yes comparator .
        i thought pins 1 and 2 were shorted but looking closely at the board they are supposed to connect together .
        have no idea why they did that .

        Comment


          #5
          Re: please help identify this component

          Originally posted by petehall347 View Post
          yes comparator .
          i thought pins 1 and 2 were shorted but looking closely at the board they are supposed to connect together .
          have no idea why they did that .

          https://cdn.badcaps-static.com/pdfs/...9d61bec5c8.pdf

          Are pins 4 and 6 or pins 5 and 7 tied together
          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

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            #6
            Re: please help identify this component

            Originally posted by sam_sam_sam View Post
            https://cdn.badcaps-static.com/pdfs/...9d61bec5c8.pdf

            Are pins 4 and 6 or pins 5 and 7 tied together
            no other pins are tied together

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              #7
              Re: please help identify this component

              I agree with above, here is a picture of one from https://es.aliexpress.com/item/ST339...818891290.html
              Attached Files

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                #8
                Re: please help identify this component

                was trying for hours to find a pic of one with same writing on to confirm its correct part ..i cant find one picture

                Comment


                  #9
                  Re: please help identify this component

                  One of the lines may be the month and year of manufacturing, or batch number, it's unlikely you'll find a picture with exactly the same writing, with all rows of text the same.

                  With all the resistors around the chip, it's indeed most likely a comparator, and they're probably using resistors as some basic voltage dividers before the chip compares voltage thresholds or something and turns on or off those transistors (sot-223 or whatever the 3 pin footprint is)

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