Mitsubishi WT-42315 42" TV "picture colors dont line sometimes" Questions

...picture will re-expand and run a while; other times it won't. Hoping the fix is either a replaceable circuit board or a board component and won't cost much... hate to have to junk this TV and buy ...

...picture. My first thought was to check the menu for video settings but none of these fixed my problem. My husband called the manufacturer who said the convergence board was bad. I called the ...

...picture ect. What could be wrong? could it be color wheel, power cord, somthing overheating, or is it the expensive main board? The fans are working and I dont have any abnormal blinking lights that ...