Biostar BT-250 got heated as soon as plugged in

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  • KoPhyoe
    Member
    • Jul 2021
    • 24
    • Myanmar
    #1

    Biostar BT-250 got heated as soon as plugged in

    Hi guys!

    I'm new to this forum and I would like to get any technical advice from my seniors here. And I'm trying to repair Desktop Motherboards and GPUs. Here is one of my problem I'm having here. Biostar TB250-BTC motherboard has no power even power switch don't have 3.3V. As soon as I plugged in 24ATX pin , this regulator got heated. Remove/Replace isn't working there. Any Advice would be appreciate! Sorry for my bad English. Thank you in advanced.





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    • sam_sam_sam
      Badcaps Legend
      • Jul 2011
      • 6039
      • USA
      #2
      Re: Biostar BT-250 got heated as soon as plugged in

      Have you checked to see if you have a short on this power supply rail that this ic chip is on its output pin

      This is what I would do first

        Comment

        • Beton
          Member
          • Dec 2021
          • 10
          • Hungary
          #3
          Re: Biostar BT-250 got heated as soon as plugged in

          I've encountered this exact problem with exactly this ic (1117) on a few different boards, this LDO converts 5VSB to 3VSB on all of them. I attached the schematic for this board.
          Attached Files

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            • SMDFlea
              Super Moderator
              • Jan 2018
              • 20864
              • UK
              #4
              Re: Biostar BT-250 got heated as soon as plugged in

              Zetex (diodes Inc.) AZ1117CH-ADJTRG1

              Datasheet https://cdn.badcaps-static.com/pdfs/...dc07ca3060.pdf
              All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

                Comment

                • DynaxSC
                  Badcaps Veteran
                  • Apr 2021
                  • 458
                  • Poland
                  #5
                  Re: Biostar BT-250 got heated as soon as plugged in

                  Hi, most probably you have a short on the chipset. You will find on the chipset top side some small supply voltage filtering caps, measure resistance on them, if you find a very low resistance around 0-1 ohm, then the chipset is dead. Normal resistances are dependent on the chipset power supply line between several 10's of ohms to kohms. Check also the 5V stand-by voltage in stand-by mode, if lower than 5V (+/- 5% tolerance), then most probably the chipset is dead. The volatge regulator gets hot, because it's operating then at maximum amperes/temperature limits, but usually it does not get broken due to the short. The caps have their positive leg usually towards the silicon, the other meter lead just connect to ground. However I have seem also chipsets with shorted caps, this can also happen, and it looks like the silicon is dead. And, the chipset has usually two power voltages, 3,3V and 1V, the 3,3V is on such older boards usually generated from the 5V VSB stand-by by a linear regulator, the one like you desoldered.
                  Last edited by DynaxSC; 12-13-2021, 10:40 AM.

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