Chromebook 11 3189 will not stay powered up if unpluged. Battery tests good.

I have a couple of chromebooks that will power on when plugged in.  I have done battery tests and they are fully charged and in good condition.  I can see this through CROSH as well as the bottom right of the screen.  I have checked connections.  I have swapped batteries.  I have fully updated Chrome and power washed the chromebook.  I have swapped chargers.  When you unplug the charger, the unit powers off instantly.  

Any input would be appreciated as they are out of warranty.