Model number us 37MF337B/37 I took of the back cover and was trying to find a burned out chip. nothing stood out. So I removed the cable line from the power supply and the video board when the lcd screen came on. My question is do your think I have a bad power supply board. or is it the video board with the tuner? Thanks for any help

Televison & Video - Toymax - Magnavox 37MF337B 37 in. LCD TV