Guides on how to do various iPhone 11 repairs can be found here: iPhone 11 although back glass replacement is complicated if it's all you want to replace. hope this is helpful!
From what I've found, A quick search on Google for "Samsung Galaxy J7 screen" yielded many results. Unfortunately, It does not appear iFixit carries the part(At least from a quick search). just make sure to include your model number when searching(it can be found in settings>about phone usually).
It unfortunately sounds like your screen is developing dead pixels. I've found that messaging the pixels can have a temporary positive effect but is by no means reliable or permanent. It looks like you might need a new screen.
If possible check that your CPU cooler is seated properly. The rapid temperature rise could be due to Poor contact with the CPU IHS(integrated heat spreader). There is a chance that your mounting hardware may have come loose.
Unfortunately the problem could be related to some failed Mosfets on the main board (positions u2 and u4). replacement I've heard replacement is difficult requiring some soldering and in-depth disassembly. your best bet is to replace the main board. to my knowledge no guides exist on Ifixit covering this process. this probably doesn't help much but I hope it provides a repair idea of some sort.
error 1 on those Roombas means that the main brushes are stalled. try cleaning the brushes of hair and other crud, be sure to focus on the ends of the brushes. hope this helps
Hi crystal. it is likely that your battery is bad and cannot supply current to run your Dyson. a new battery can be found on Ifixit here. hope this helps.
Hi Deezero. Unfortunately if bending it back into shape didn't work you will have to replace the rail. the casing of the switch should be able to be bent back into shape. you can get a new rail from Ifixit here And a guide to replace it yourself can be found here. Hope this helps