Hi;

This is a Vizio M420NV.
Backlight was out, I found an open 3A fuse (TF1) on the main board that carries 12.4 vdc. When fuse replaced, the backlight will flash a couple of times and poof goes the fuse again.

I don't have a diagram. I wonder if this might be due to a inverter fault ?
I checked power transistors on main and power supply board.
Any ideas ?

Thanks,