the inverter board seems to cause the most problems on lcd tv. follow the wires that run from the power supply until you find them connected to a little rectangular board. on the board there is a tiny fuse (component), next to it it should say something like F1. if you have a multimeter measure across the component and see if you get 0 ohms. if you dont get a reading the fuse has gone. normally the fuse is about 4 amps. it is impossible to get a replacement. so you can solder a piece of 5 amp fuse wire across the pads. its done the trick for me many a time.