unic uc40 projector problem

I have taken unic uc40+ Projector from eBay after using it few months atleast 6hrs per day continues use now i am some spot started coming I opened and checked it I see an burning type spot at the back not on led screen but just at the back of screen I don’t know it’s name after removing it display also goes so I put that back anyone have solution or can tell me from where I can get that see my review at youtube and pls help me if anyone can htt.../m.