840 g2 keyboard problem

[estabilito]

I have 6050a2637901-mb-a02 840 g2 hp elitebook with keyboard problem:
some keys doesn't work even on 100% working keyboard (tested on another laptop) - i've replaced KBC and problem still exist. On external keyboard every key is working. What can i do more? keyboard driver uninstall tested too.

[reformatt]

Re: 840 g2 keyboard problem

I had something like this on a HP 450 G3 with a Nuvoton EC. I replaced that EC and the keyboard and it was working until I put it fully back together. The fault was caused by the WIFI and Sound button board. When that was connected, it interfered with the EC scan lines I believe. Fault disappeared when this button board was replaced. I don't know what the fault was with that board.

So try disconnecting other things to the mobo and see if fault goes away. Of course I am making the assumption you've buzzed out all the scan lines from the EC to the keyboard connector correct?

[estabilito]

Re: 840 g2 keyboard problem

yes - ill try this, thanks