Lenovo Chromebook with peculiar keyboard issue

[trepachka]

This chromebook I have exhibits strange behavior that I am unable to figure out. Pressing certain keys on the notebook keyboard, for instance "Control", "t" or "c" by itself will restart the notebook. If I press "2" key, a string of "345789" will show up. I have replaced both the keyboard and the motherboard and the notebook continues to have the same issue. Even with the original motherboard installed, I can attach an external keyboard and it will work just fine but not on the internal keyboard.

What could it be? The storage drive? I am down on culprits and so far do not understand what is going on.

Can anyone help? Thank you.

[mon2]

Re: Lenovo Chromebook with peculiar keyboard issue

Are you shorting anything under this keyboard to the logic board during the keypresses?

[trepachka]

Re: Lenovo Chromebook with peculiar keyboard issue

I could take a look. Nothing looks suspect when I inspected it. I could also unplug most of the stuff except for keyboard to see if the problem continues. Keep in mind, this continues to occur with new keyboard and motherboard.

[sikocan]

Re: Lenovo Chromebook with peculiar keyboard issue

Try putting a layer of film/plastic between keyboard and motherboard. Try again.

[trepachka]

Re: Lenovo Chromebook with peculiar keyboard issue

I completely removed the motherboard from the notebook housing. I removed the storage drive, the heatsink with a fan, the daughter board and the wifi card. I detached the screen. So, basically only the keyboard+touchpad are connected. My voltage indicator dongle resets when I press "Control", "t" or "c" keys and the red light on the motherboard flashes, also confirming the reset. Remember that I replaced both the motherboard and the keyboard assembly.

So, I am at whits end. Very frustrating to say the least.

[sikocan]

Re: Lenovo Chromebook with peculiar keyboard issue

That is a very strange issue. Does it have touch screen? Could you just try new keyboard, motherboard with external screen + power wash the chromebook (reset).

[trepachka]

Re: Lenovo Chromebook with peculiar keyboard issue

I am trying to preserve what's on the storage drive. I thought powerwash will wipe out the data as well? Is there a way to reset hardware without wiping out data? Meanwhile, I will try to see about the external screen. By the way, I am using new motherboard and keyboard assembly now.