yes battery was disconnected while trying to use the wrench. Here some photos of the motherboard and the EC chip ​...

Hello !

After opening an hp elitebook 830 g8 because i wanted to read and write EC chip for unlocking BIOS, the computer has black screen and caps lock led on. Not blinking, just on.It begins at the time I've reconnected the battery or at the time i plug the DC power, before i push the power button.

That's weird because i didn't succeed to write the chip because my wrench was not the good one (too large). I've tried disconnecting the battery, the cmos, the ram and drive and reconnecting everything, not working. i've tried on DC with no battery, not succeed. I did not...