I had this same problem with my Mintek dtv 265...I had anticipated a problem, as I had bought it used on ebay for $100. After some research, I decided to purchase a new mainboard ($130), which completely fixed the problem!! :-) So I paid less than $250 for an incredible lcd/tv/dvd. If you have some patience, common sense, and a screwdriver, it's an easy fix...and cheaper than paying a technician $35+/hr just to look at it!
Ray
May 2009