I have a 42 inch akai plasma that i was told needs a mainboard. I came home one day from work and turned on the tv and there is no picture. the sound was fine, and i had someone come out and look at it and he said that a mainboard needed to be replaced. i'm wondering if it is even worth fixing this tv or not and if so an estimate on how much it would cost to fix? model number is pdp4602em. thanks in advance!