Testing N P channel mosfets in a Samsung 710N

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  • robcar
    Member
    • Nov 2015
    • 26
    • Italia

    #1

    Testing N P channel mosfets in a Samsung 710N

    Hello,

    I wonder if it is possible to test in circuit these 4501GM (or similar N P mosfets) found in a Samsung 710N's power board.
    I looked in a guide here in the forum, but it is mentioned to measure Ohms and I don't get meaningful data.
    So can someone tell me where I should put the leads of my multimeter and the value that I should get in the various testings?

    thank you
    rob
    Attached Files
  • robcar
    Member
    • Nov 2015
    • 26
    • Italia

    #2
    Re: Testing N P channel mosfets in a Samsung 710N

    Ok,
    I managed to test a working video, same model, same board, exact revision. Those below are the value that I read on the DMM display in diode test mode, with the mosfets in circuit.

    This should be the N-channel side:
    Black lead on S1 - red on G1: 0L
    Black lead on S1 - red on D1: 0L

    This should be the P-channel side:
    Red lead on S2 - black on G2: 0L
    Red lead on S2 - black on D2: 0L

    While with the not working board I got:

    This should be the N-channel side:
    Black lead on S1 - red on G1: 0.323v
    Black lead on S1 - red on D1: 0.004v

    This should be the P-channel side:
    Red lead on S2 - black on G2: 0L
    Red lead on S2 - black on D2: rising till almost 1V then 0L

    So, I got 2 different sets of reading, but I cannot tell if they alone can tell me if the mosfets on the not working board are broken, without previously removing them.

    Comment

    • jiroy
      Badcaps Legend
      • Jun 2016
      • 2416
      • Lebanon

      #3
      Re: Testing N P channel mosfets in a Samsung 710N

      Testing Mosfets on boards isn't what one should do , unless he has a schematic showing what precise voltages should be . Further , Some points or what we call Tip is to be measured with an Oscilloscope .
      So basically , if you don't have a schematic , you should remove a mosfet in order to test it in a good way .

      Comment

      • robcar
        Member
        • Nov 2015
        • 26
        • Italia

        #4
        Re: Testing N P channel mosfets in a Samsung 710N

        Ok,
        I'll remove and test the mosfets. Btw I ordered a bunch of mosfets for another very similar display:
        https://cdn.badcaps-static.com/pdfs/...dfffdeffe2.pdf
        To me they appear equivalent to the 4501GM of this video.

        Comment

        • jiroy
          Badcaps Legend
          • Jun 2016
          • 2416
          • Lebanon

          #5
          Re: Testing N P channel mosfets in a Samsung 710N

          Originally posted by robcar
          Ok,
          I'll remove and test the mosfets. Btw I ordered a bunch of mosfets for another very similar display:
          https://cdn.badcaps-static.com/pdfs/...dfffdeffe2.pdf
          To me they appear equivalent to the 4501GM of this video.

          All i can help you with when testing the Mosfets is basically looking for shorts , at Diode level . In most cases , if a Mosfet is damaged , you'll see lot of shorts .. While doing this , pay attention not to use your fingers touching the legs cause mosfets tend to change their internal resistance ..

          About compatibility , i always prefer the same original type , but in rare cases , when a component is unavailable , you can try if legs of both mosfets fit the right places and the specifics are very close ..

          Comment

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