I don't have the remote for my RCA CRT TV model 27645 and can't figure out how to switch to have it play video games that are plugged into the RCA jacks in the back. I've tried all the Menu options, can someone tell me if it's possible to switch the video source without the remote? I've even programmed my cable remote to work the TV but it's Video Source button doesn't switch it either. Thanks for any help.