On Tuesday, 5 March 2013 13:13:58 UTC, Sparkey wrote:
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,

Hi there, I would also check any electrolytic capacitors on the inverter board, making sure they are at least 105 degree celcius type with low equivalent series resistance - low ESR type.