When I opened up my Switch connected to my old (last-gen, I dunno) 2010 TV. It's an LG LCD TV (Model is 21,5 M227WAP. I don't know the actual model code or something though so go tell me the moment I post this), it looked as though my Switch was connected to a 4:3 TV and it sucked. I thought it was just gonna downscale it and fill up the entire screen looking stretched (I'm okay with that anyways) but no, not for this case. I'm looking for a suggestion on how to fix this.
Have you tried manually changing the screen size via TV Settings?
- From the HOME Menu, select "System Settings."
- Scroll down the menu on the left-hand side of the screen and select "TV Settings."
- Select Adjust Screen Size. (Dock the console and follow the on-screen prompts to manually adjust the screen size)
Additionally, changing the TV Resolution here may also help.