So I have a vizio M3D421SR as soon as I plug it in the vizio light comes on white for about 3-5 seconds then starts flashing, then goes back to solid but the tv never comes on, no backlight either. I have replaced the video driver board 2 times, sent out the mainboard for repair but they found nothing. My questions are:

1. Is the power supply the problem, and can come one tell me know to text it.

2. Do you think the company I sent the main board to may have missed something?

3. Is it possible both LED driver board I received are damaged.

Re: Vizio M550NV - Flashing Logo Stuck at Startup Screen

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