I’ve had my roku tv for about a year and a half and suddenly the brightness got so dim i can barely see anything. I changed the brightness in settings to every single one and nothing changed and i have restarted it multiple times can someone please help
That sounds like a hardware issue with your TV. Roku doesn't manufacture the TVs, so you need to contact the company that built your TV.
Most TVs have some sort of backlight that provides the illumination for the screen. If that light fails, you get a dim, perhaps even unviewable screen. Plasma and OLED use different technology, but any TV labeled as LED or LCD is illuminated in this manner. It's a hardware issue, so the TV manufacturer is the one to provide assistance.
Dan Roku Stick (3600), Ultra (4640), Ultra (4670), Ultra (4800), Premiere (3920), Insignia 720p Roku TV, Sharp 4K Roku TV, Nvidia Shield, Windows 10 Pro x64 running Serviio and Plex on a wired Gigabit network.