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HP Elitebook 840 G3 Caps and Power Button Blinking Doesn't Power On

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    HP Elitebook 840 G3 Caps and Power Button Blinking Doesn't Power On

    After installing new battery and a 265gb nvme pcie hard drive for my laptop, I notice the laptop came on to BIOS detecting the drive and battery, after I power off the laptop, it got caught up in a boot loop, where as soon I plug the charger it will boot up (turn on fan and keyboard will light up) and then off. I remove the battery and hard drive, then connected the charger and continued to bootloop. I did a power reset by holding down power button for 20sec, didn't fix it, I hold power button for 1min. Then plug charger, and it will not power on or bootloop, now the caps key and power button come on and off (flashing). Now power, no display (during boot loop the display didn't come on) I tried reseatting the ram, and didn't fix it either. This laptop was able to boot into BIOS.
    what you guys suggest?
    thanks

    #2
    Re: HP Elitebook 840 G3 Caps and Power Button Blinking Doesn't Power On

    I just started troubleshooting the board and I noticed when I press the power button the 3.3 volts do not go to ground at the connector... I circled the power button on the picture. can someone verify that is the correct power button connector?
    Attached Files

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      #3
      Re: HP Elitebook 840 G3 Caps and Power Button Blinking Doesn't Power On

      Isn't the Power Button on a seperate Board?

      In this Case it can't be so hard to Figure Out whether the Power Button is working properly.

      I believe there is also the Lid-Switch and it is possible you confused the Voltage Readings.

      However without Checking the Sub-Board or all Pins of the connector, No progress

      Easiest should be to just unscrew the Board and Check directly at the Button. Usually it will Work this way.
      FairRepair on YouTube

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        #4
        Re: HP Elitebook 840 G3 Caps and Power Button Blinking Doesn't Power On

        Possible that the power adapter connector has a bad solder joint.
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          #5
          Re: HP Elitebook 840 G3 Caps and Power Button Blinking Doesn't Power On

          The History from the Link Would have been useful in this original Thread...

          https://www.badcaps.net/forum/showthread.php?t=97547

          Why did you openened at least two Threads for this?

          It could be, the 3V LDO is partially shorted. What is the Résistance to GND in Ohms, where you measured the 2.3V?

          In my opinion the issue Points Into the direction of the EC/SIO.
          FairRepair on YouTube

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            #6
            Re: HP Elitebook 840 G3 Caps and Power Button Blinking Doesn't Power On

            Originally posted by Sephir0th View Post
            The History from the Link Would have been useful in this original Thread...

            https://www.badcaps.net/forum/showthread.php?t=97547

            Why did you openened at least two Threads for this?
            That second thread is deleted now.
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