How do I fix my WD32HD1390 tv changing channels repeatedly

My mom took my WD32HD1390 TV I've been using for my PS3 on HDMI 3 without the tv remote because I lost it, and she used it for her karaoke event thing and when she gave it back, the source and menu screen kept showing up and leaving randomly, I ignored it for awhile, but a few months later the bottom right of the screen lit up a bit when turned off, barely visible even at night, and just a few weeks after, the channel's started changing repeatedly making it unusable, now I'm trying to buy a new remote on Amazon for it because I saw something online saying I might be able to disconnect the button board and pair a new remote to it but I don't know if that'll work and I don't know how to do that