Facing TV Problems? Ask a TV Technician.
Hello and sorry you're having problems.
Offhand, I don't have good news on this problem- and the symptoms you have, are directly indicative of a failure LCD/LED panel. I don't want to offer false hope- so I wanted to get right to the point and give you an accurate answer for this problem. The blue spot, is n area of the liquid crystal which has leaked from within the inner screen, to between the outer plastic/inner screen layer. To fix this problem requires complete replacement of the LCD/LED panel- which costs 80% of what the TV cost when new, and requires complete dis-assembly and rebuilding of the set- from the inside out.
I'm very sorry for the dismal news, and I wish there were a quick fix for this problem.
If you need further assistance let me know. Please do not forget to click a POSITIVE RATING before you go- as it's how I am credited for my work. You can follow up at any time, at no additional cost.