Vizio M550NV, VIZIO LOGO LED turns on but no picture, not sure about audio, THE BACKLIGHT NOT WORK. ALWAYS the vizio logo is on.

I believe the reason you aren't getting audio now is it's not on the right input and with no picture it's hard to adjust. On a Vizio set it could be 2 things, bad LED driver or bad backlights.

https://support.vizio.com/s/article/M550NV-Model-Information?language=en_US#

1. Check the audio setup menu, make sure that the internal speaker is turned on;

2. If the internal speaker is turned on, the problem is the main board.

3. If you use a set-top box (such asa cable box or a satellite box) it may be defective. To vitrifying it , please connect a DVD player to the TV, play a move, let see it has sound or not.

Vizio 0500-0612-0030 Power Supply / LED Board for M550NV

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Vizio 55" M550NV 0500-0612-0030 LCD Power Supply Board Unit Motherboard. ... Any tears or bad connections between boards must be replaced FIRST. 2.

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T con board.

Try this thread : SOLVED VIZIO M550NV NO PICTURE NO SOUND It sounds like the same problem that you have.

Test the power supply voltages and see if some are missing or incorect, if they are replace the power board

This TV comes with a remote that connects to the TV via Bluetooth. It remembers which equipment is connected to the various inputs, and automatically changes the controls to match the input equipment - really nice! I found that it will control all my equipment, and since it works via bluetooth, you don't have to have direct line-of-sight to the TV. Wish that the bluetooth part worked for my satellite equipement too! Programmable remotes will operate this TV, but depending on how old they are, they may not be able to hit all the features of the tv - our older directv remotes will operate the basic features, but only the newer models will change the input source - so you may want to use the remote that came with the TV. We have smaller kids, and wanted to limit their use of the tv remote, because it has a slide-out keyboard similar to those on some cell phones to make posting to facebook (one of the apps that comes on the tv) easy. Since our youngest is 5, we thought it might be best to keep that remote out of harm's way.

More Detail :
http://tv.babybi.com/detail.php?id_detail=VIZIO-M550NV-55-inch-Full-HD-1080p-120Hz-LED-LCD-HDTV-id126a

I had same problem. Unplug set for 10minutes then plug it in and let it go thru it's startup routine.