How can i correct a srambled image on my monitor?

My unit is a jvc video cd player, model xl-mv303. When the title and music frist starts the image looks fine; but gradually deteriorates until all words are completely scrambled. This just started. The TV monitor is working fine. It does it when trying to play any karaoke cd. I have run a cleaning cd, but the prolem still persists. Any ideas? Also, any ideas who can repair this for me if I am unable to do so myself?