How do I get my Colortrak Tv to video mode without a remote?

I have a ColorTrak XS Stereo Tv, model F27250BC, and I would like to switch it to video mode, like av1 or av2 to use my PS3. I do not have a remote. People told me to use like channel 91 or 92 but nothing happens. The only buttons on the front are a Menu button, channel buttons, volume, and power. Please help!