Big black circle spot appears on the upper left side of the lcd

Left Bolt

https://www.google.com/search?q=1994+Dodge+Grand+Caravan.+left+rear+upper+shock+bolt

Right Bolt

https://www.google.com/search?q=1994+Dodge+Grand+Caravan.+right+rear+upper+shock+bolt

And you will notice there is a history of them breaking

..

A large black spot usually means the LCD screen is damaged. It may have fine cracks around the black spot. In this case the LCD screen needs to be replaced.
A replacement screen maybe available for your laptop from this WEB site.
LCD screens and Inverters www.lcdparts.net

screen back light on the other side is busted which need replacement.

Could be a "dead" area of the lcd screen. If your pics turn out ok, don't worry about it.

Bad LCD panel. https://www.encompassparts.com/webwiz/wwiz.asp?wwizmstr=WEB.SEE&partnumber=7857212

Once you get a dead pixel (black dots), there is no way to repair that part of the screen

Depending on the age of the monitor, this could be a symptom of a failing LCD display (or CRT tube, if you're using one of the older styled big ones). one way to test for sure though, is if you have access to another computer (whether it be desktop or laptop, shouldn't matter) and hook it up to that one and see if the same thing happens. If it does, then you know that your monitor is at fault. If you are within manufacturer's warranty you can usually get it repaired through your place of purchase, or directly with the manufacturer themselves, but if not, then repairs are usually not worth it, and will probably cost more than the monitor is currently worth.

Try cleaning the contacts on the connectors going into and out of the Tcon board, if that doesn't fix it replace the board, here is the manual if that helps.
Samsung HL S4266W Owner Instructions Manual

Well, not sure if you got it resolved yet but the same thing happened to me. Brought it back and got it fixed under warranty. You'll most likely see more gray circles appear over time. They don't affect the picture but they are annoying.
Cheers
Dan

Is it a fuzzy spot or an actual hard edged black spot?LCD televisions can have a loss of pixel display- most very small. Was the TV hit with something or dropped against something (the screen)?

OR Try this first:
Black box appears on the screen
• Closed-captioning might be on. Check the Analog or Digital Caption option in the Setup menu.

Please let me know if your problem is solved. Thank You.