Announcement

Collapse
No announcement yet.

I need a basic BIOS circuit

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

    I need a basic BIOS circuit

    Hi everyone, I want to understand the basic electronic circuit of an old motherboard. I need some guidance about ins and outs of this circuit, e.g. what feeds power into the CR2032 battery and how does it work.

    Best regards.

    #2
    Re: I need a basic BIOS circuit

    Is it a common BIOS chip like the attached picture? Are you trying to work out how the CR2032 powers the chip?
    Attached Files

    Comment


      #3
      Re: I need a basic BIOS circuit

      Not sure exactly what you are asking for. The schematic of how the battery is connected?
      https://www.makeuseof.com/tag/why-do...ave-a-battery/
      https://www.deskdecode.com/cmos-battery/
      Never stop learning
      Basic LCD TV and Monitor troubleshooting guides.
      http://www.badcaps.net/forum/showthr...956#post305956

      Voltage Regulator (LDO) testing:
      http://www.badcaps.net/forum/showthr...999#post300999

      Inverter testing using old CFL:
      http://www.badcaps.net/forum/showthr...er+testing+cfl

      Tear down pictures : Hit the ">" Show Albums and stories" on the left side
      http://s807.photobucket.com/user/budm/library/

      TV Factory reset codes listing:
      http://www.badcaps.net/forum/showthread.php?t=24809

      Comment


        #4
        Re: I need a basic BIOS circuit

        the battery has nothing to do with the bios, it just runs the real-time clock.

        Comment


          #5
          Re: I need a basic BIOS circuit

          The battery used to have to do with the BIOS settings. Nowadays indeed it does nothing much except run the clock. The BIOS settings are stored in the ROM itself. As a side note, that's why BIOS goes bad so often on modern boards.

          Now coming back to the question asked, there is a double diode which feeds the CMOS memory. One side comes from the RTC battery, the other from a 3.3V source which is always present as long as the device is plugged in.
          Originally posted by PeteS in CA
          Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
          A working TV? How boring!

          Comment


            #6
            Re: I need a basic BIOS circuit

            What make and model of motherboard?
            Follow me on YouTube
            ------------------
            Learn Electronics Repair
            https://www.youtube.com/channel/UCFX...R8UZ2vg/videos

            Comment

            Working...
            X