820-00164 sensor problem

[PhilipC]

Liquid damaged power button doesnt work but boots on charger, main issue is fan runs high all the time.
Also the left shift ctrl and alt dont work, but i'll look at that later.

Im guessing that this is a temp sensor failing, but no efi for these machines is there any other way to view the sensors measurements?

 

[PhilipC]

just remembered that there's a sensor in the trackpad so replaced kb connector now power button works and high fan has gone away but left shift ctrl and alt still not working

 

[larossmann]

You tried a known good trackpad/keyboard/trackpad cable right?

 

[PhilipC]

Yep tried known good tpad cable trackpad and keyboard

 

[dukefawks]

J4800 pin 19 supplies 3v42 to make those keys work. Bad trace or connector I guess.