The easiest option would be hard/factory reseting the device it found someone who said hold the button for 20 seconds you will need to add back the contacts. Update (08/13/23): Hello I did some more reasearch and lt liiks like you need to dial a special code #174714#. Hope this works!

I had purchased a used fridge different brand there was a switch in the system that looked to be on a timer and I had to turn it back. (Probablly planned obsolence) I looked it up but it said it did not have one which was false for my model. The switch was located in a pannel in the fridge side on the roof near the temprature controller. Check near the temp controller and see if there is a faluty component; this would be where the compresser is sent power or recives the signal to turn on.

I would check the connection to the backlight with a mutiimeter make sure to check that the cable did not come lose. You should only need to replace the backlight if that is an issue. I would check the laptop with an external monitor to see if it an issue with the screen or it is something worse like an issue with a component related to the display. I do not know if there are any signs of life like a startup sound but that would mean the laptop is still fully functional. Be very careful and do not apply any pressue to the display. If glue is used you may need to purchase some isopropyl alcohol get 91% as low purity can act like water and damage components. Hope this helps.