Right first of all go to the app store Download the Camera+ app and a Flashlight app and try and see if it works, if not take your device apart(look on ifixit) and get a new battery as the torch&camera do take up a lot of battery so it might have put alot of pressure on your battery if you use it regularly. Please note that I am not responsible for damage to your device. This is just advice. If you wanna stay on the safe side, go to a local electronics repair shop and chuck in a fiver
What as happened has that your xbox can't hold too much power after the repair. You need to get a new cable which connects the mains connecter socket to the xbox. Try down a electronics repair shop.But if it doesn't work, I am not responsible for damage to your device..
M8 what u need to do is take your whole phone apart(Look up on iFixIt) then maybe get a new battery(tenner down the phone repair shop) as loo water may have also affected the battery then leave it on charge for abt 25mins then change its screen(fiver down a repair shop. depends on if ur phone is an edge or normal). You just need to leave it on charge overnight after all that. Level 2 simple fix.