Can a mosfet replacement slow to 500mhz in BIOS I3

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  • marce002
    Badcaps Veteran
    • May 2018
    • 316
    • Argentine

    #1

    Can a mosfet replacement slow to 500mhz in BIOS I3

    Hello

    I have a generic medion like laptop core i3 (Tcl rca is the brand) which shows 500mhz in bios at cpu speed.
    I have received it with no power at all. Found it to be a mosfet in 19vol line close to the power jack and also a capacitor around the vcore which was shorted i think close to vcore power supply. I ve dound NO schematics fof it. It is a c14d motherboard rev2.

    My Question is:

    I ve placed a N channel mosfet 8A which is FDS884 to replace the 10A original which is SM4839 one and also placed a similar small capacitor in place instead of the broken shroted one which cannot measure or figure out what uf is it.

    So my question would be can my new mosfet or the capacitor replacement be causing this 500mhz in bios? or maybe it was a problem before comming here?

    Power adapter is original and same result if pluged to my lab power supply.

    Thanks for any hint.

    Original mosfet: SM4839
    Replacement i put: FDS884

    And here is the picture to the capacitor zone.
    Attached Files
    Marcelo J
  • ktmmotocross
    Boardkiller
    • Feb 2014
    • 3578
    • slovakia

    #2
    Re: Can a mosfet replacement slow to 500mhz in BIOS I3

    if is voltage ok than i think it is not related to fault

    that FDS is way better than SM



    test procesor speed in system or under load.
    Last edited by ktmmotocross; 08-11-2020, 01:30 AM.

    Comment

    • marce002
      Badcaps Veteran
      • May 2018
      • 316
      • Argentine

      #3
      Re: Can a mosfet replacement slow to 500mhz in BIOS I3

      Thanks... nope still 500mhz stucked in bios.... i tried with temporary mosfet bridge and same results in windows and bios.... benchmarks in windows shows 488mhz... and it is an i3 2.53 ....sad..... should vcore volt the culprit? Or bios programming?
      Marcelo J

      Comment

      • ktmmotocross
        Boardkiller
        • Feb 2014
        • 3578
        • slovakia

        #4
        Re: Can a mosfet replacement slow to 500mhz in BIOS I3

        reprogram bios, check thermal sensors, voltages

        Comment

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