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samsung NP-RV410L that doesnt power up

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    #1

    samsung NP-RV410L that doesnt power up

    HI Guys i have been working on a samsung NP-RV410L that doesnt power up, so using power supply i found something that gets very hot, TPS51125,that chip controls 5 and 3 v always, so i change that chip for the same printed number and it keep getting hot, what can it be.

    tps51125

    VIN-17.94v
    EN- 1.29v
    VREG5-5v
    VREG3-0.83v
    ref-2v
    TONSEL-0.82v
    SKIPSEL-2v

    https://cdn.badcaps-static.com/pdfs/...c3b552ae45.pdf
    Attached Files
    Tags: None
    #2
    Re: samsung NP-RV410L that doesnt power up

    Vreg3 its 3.3v alw

    You got short there
    Just cook it! It's already broken.

    Comment

      #3
      Re: samsung NP-RV410L that doesnt power up

      HI, i already measure, pin VREG3, to ground and nothing beeps,on the multimeter, how to know where to measure ???

      Comment

        #4
        Re: samsung NP-RV410L that doesnt power up

        Check KBC.

        Comment

          #5
          Re: samsung NP-RV410L that doesnt power up

          this is is KBC pins, which pins should i measure.
          Attached Files

          Comment

            #6
            Re: samsung NP-RV410L that doesnt power up

            also check the BIOS. it gets 3.3v from VREG3.

            Comment

              #7
              Re: samsung NP-RV410L that doesnt power up

              HI guys well i think i found something, that probably someone can tell me if smsc is short, when i power up motherboard if you see the smt2 is a small solder look at that pic please, when is joing into one motherboard doesnt power up, but when i separate that small solder, motherboard lights up, i measure that pin 68, and is good nothing short, i cant find those capasitors , because this board doesnt have anything print in it. i forgot one thing when i power up board with that solder joing, TPS gets hot, is like smsc send a voltage to enable and make TPS hot, TPS is not short.
              so you guys think something wrong with SMSC.
              Attached Files
              Last edited by jonny0404; 03-31-2015, 11:31 AM.

              Comment

                #8
                Re: samsung NP-RV410L that doesnt power up

                check mosfets & capacitors close to TPS51125. more than likely one is shorted on VREG3

                Comment

                  #9
                  Re: samsung NP-RV410L that doesnt power up

                  thanks for bios acer d271

                  Comment

                    #10
                    Re: samsung NP-RV410L that doesnt power up

                    Alguien tiene la Bios de esta Maquina que me pueda facilitar?? Samsung RV410L

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