Any one by chance have a wiring schematic for a Mit's WS-73903? I lost my picture and the service guys that came to look are idiots. I want to find the problem myself. Symptom: No picture, but sound. Me: "Are there separate power supplies for the Video and Audio?" Service: "No." Me: "Any thought's on what's wrong?" Service: "Could be the power supply." Me: "Well how could that be if there is only one power supply." Service: "Well, it's because they are very complicated." So complicated that you can learn the trade through a Sally Struthers correspondence course? Give me a break...I'll find the problem.