Strange problem and solution (BIOS - Bad Caps)

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  • mecmast
    Member
    • Jun 2021
    • 15
    • Cyprus
    #1

    Strange problem and solution (BIOS - Bad Caps)

    Hi,

    I was working on a laptop motherboard, all the caps (including polarized ones), resistors and some of the inductors were shorting the ground.

    I've tried many things, changing MOSFETs, caps, etc.. but nothing did solve the problem.

    After re-programming a new bios made the trick and the laptop works perfect now.

    I'd like to ask if the problem, shorting to ground, was because of bad BIOS? This is the first time i see a lot of shorts.
    Tags: None
    • Hexel
      Member
      • Jan 2019
      • 15
      • Ukraine
      #2
      Re: Strange problem and solution (BIOS - Bad Caps)

      Do you have exact reading of resistances, before reflashing?
      If you rely on multimeter measure "beeping"/"not beeping" it is correct only for electricians working on house wiring.
      Just after de-energizing, switching voltage regulators goes into Output discharge mode, when output is formely shorted to ground. It may be your case, but I not sure about correlation with old/new dump.

        Comment

        • mecmast
          Member
          • Jun 2021
          • 15
          • Cyprus
          #3
          Re: Strange problem and solution (BIOS - Bad Caps)

          Resistances: No reading or wrong readings.

          I've measured'em all.

          After the BIOS no short readings as beeping like electricians working on house wiring.

            Comment

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