I can only see half of the screen

you should probabaly take it to a repair shop but if you want to go cheaper you can buy a new screen on amazon with tools and instructions

goto bios and select set default settings if it dont happens still reboot your laptop to default factory settings

No,problems u discribing the LCD screen panel some how it shorted and dead.Replacing the LCD screen panel is not an option,because LCD screen panel are 90% of the tv,so replacing it.LCD screen panel will cost the same as a new tv,because LCD screen panel are limited produced by the tv corporations.It time to buy a new tv.

Sounds like the color wheel is not turning properly. I would recommend calling 1-800-samsung to set up repair with an authorized service center. I would not try to replace it yourself. The part costs $120.00- $180.00.

u have bad lower buffer board

replace c1853 and c1854 in power suply they are boath 1500uf

much of it is pretty straight forward, the only hard part is putting the ribbon cable thru the hinge for the top screen, without ripping it, best thing to say is put the ribbon cable in first, then the wifi and mic cables (black and white), rest is pretty straightforward.

captioning on turn off with remote.

you need to replace y-sustain board.

if it is just half of the screen and the rest is black- you need a new screen. If it is half the screen all squished together (you can see the whole desktop) you need to reload the video driver