help plz SA100 shorted mosfet

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  • mo000
    Badcaps Veteran
    • Nov 2017
    • 273
    • algeria
    #1

    help plz SA100 shorted mosfet

    Hi everyone
    Samsung SA100 comes to me with blinking issue the monitor power on for a second and then goes off
    When i test the monitor on power supply the monitor has now power with short on powe supply , i don't know why this happen , i found a shorted nchannel mosfet when i change with new one becomes shorted again
    Can you halp me .
    Attached Files
    Last edited by mo000; 12-07-2021, 05:49 PM.
    Tags: None
    • mo000
      Badcaps Veteran
      • Nov 2017
      • 273
      • algeria
      #2
      Re: help plz SA100 shorted mosfet .

      any idea .

        Comment

        • R_J
          Badcaps Legend
          • Jun 2012
          • 9535
          • Canada
          #3
          Re: help plz SA100 shorted mosfet .

          That looks like the mosfet that boosts the voltage for the led backlights, check that the led string is ok and that it is not shorted.

            Comment

            • mo000
              Badcaps Veteran
              • Nov 2017
              • 273
              • algeria
              #4
              Re: help plz SA100 shorted mosfet .

              Originally posted by R_J
              That looks like the mosfet that boosts the voltage for the led backlights, check that the led string is ok and that it is not shorted.
              thank you
              i found the mosfet in blue circle burned i change it but it burns again and the mosfet in red circle becomes shorted
              i try the motherboard without screen but the same results .
              I'm sure the problem in backlight section but i cant find the source

              can you mark the components that i have to check ? .
              Attached Files
              Last edited by mo000; 12-12-2021, 12:45 PM.

                Comment

                • SMDFlea
                  Super Moderator
                  • Jan 2018
                  • 20551
                  • UK
                  #5
                  Re: help plz SA100 shorted mosfet .

                  Originally posted by mo000
                  thank you
                  i found the mosfet in blue circle burned i change it but it burns again and the mosfet in red circle becomes shorted
                  i try the motherboard without screen but the same results .
                  I'm sure the problem in backlight section but i cant find the source

                  can you mark the components that i have to check ? .
                  Samsung S19A100N Service Manual. Read section 4.2
                  Attached Files
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                    Comment

                    • NAJMO39
                      New Member
                      • Jul 2024
                      • 1
                      • Algeria
                      #6
                      Hello everyone, the Samsung SA100 comes to me with a similar problem, with overheating from the mosfet, with the voltage rising from the 15V transformer and oscillating in the card ports, and the screen is black. Please help me as soon as possible. Thank you for your understanding.

                        Comment

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