When to replace KBC?

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  • MDY
    Senior Member
    • Jan 2014
    • 75
    • Spain

    #1

    When to replace KBC?

    Hi,

    Normally when you replace KBC? Which case?

    If I have 3V and 5V and laptop doesnot run and doesnot try to run, should be bios or KBC, right?
  • highpulse
    i hate HP
    • May 2013
    • 1489
    • portugal

    #2
    Re: When to replace KBC?

    not only , if KBC detects something abnormal in some hardware part its suficient to not start . usually you must make some measures on bios and KBC to know if all feeds and signal are present to make the board work . in any case here is a simple turorial

    0. When BIOS & EC-firmware 100% are working
    1. When EC power is present, his quartz working and EC reading the bios data (look data exchange on BIOS chip an oscilloscope)
    2. When ACIN = 3.3V
    3. When LID_SW# = 3.3V
    4. When EC drop RESET from SouthBridge, ั‚.ะต. EC_RSMRST# = 3.3V
    5. When by pressing of the power button the signal ON/OFFBTN# falls to zero and the same signal is broadcast in PBTN_OUT#
    6. When from the SouthBridge signals PM_SLP_S3# and SLP_S5# are drop, i.e. voltage on them will be 3.3V
    Under these conditions EC should give command for start.

    i hope it helps but there are as well more usefull things to chek , this is a simple chekout

    Comment

    • MDY
      Senior Member
      • Jan 2014
      • 75
      • Spain

      #3
      Re: When to replace KBC?

      Do you make measure on bios? In Bios only I measure 3V. Can I measure something more?

      Comment

      • ktmmotocross
        Boardkiller
        • Feb 2014
        • 3553
        • slovakia

        #4
        Re: When to replace KBC?

        u can measure the bios loading with osciloscope

        Comment

        • highpulse
          i hate HP
          • May 2013
          • 1489
          • portugal

          #5
          Re: When to replace KBC?

          pin 1 spi , but for that like KTM only with microscope , with VM you can notice very
          small oscillation on votlage , but that cannot confirm you much .

          Comment

          • MDY
            Senior Member
            • Jan 2014
            • 75
            • Spain

            #6
            Re: When to replace KBC?

            Measure the bios loading with osciloscope is good idea? Should I get a osciloscope only for this?
            What do you mean with KTM?

            Comment

            • ktmmotocross
              Boardkiller
              • Feb 2014
              • 3553
              • slovakia

              #7
              Re: When to replace KBC?

              digital osciloscope ffor usb cost about 100e.

              if u r not technician it is useless for u

              Comment

              • MDY
                Senior Member
                • Jan 2014
                • 75
                • Spain

                #8
                Re: When to replace KBC?

                can you give me sime link to see on ebay or internet?

                Comment

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