46" LCQ VIZIO WON'T TURN ON ALL OF A SUDDED

If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/

see this instruction: God bless you

1. Check if the power cord has been properly connected to the power outlet.
2. Check if the main power has been switched on.
   (DVD player's power supply transformer could be burned out)

3. test the power outlet wall see the diagram
4. do not use the r.control use the power button directly from TV.

Check the remote control for its infrared emission. Check this link and select the site 'Electro-help' for details. Detailed description is there, about how to check and repair a remote control. Pull up older posts.

The other expert here is right--main is not being turned on and either main board or power supply could be bad.

Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/ In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.

There are at least two power supplies in any set with remote capabilities; one is on any time the set is plugged into AC and is supplying that indicator and the receiving circuit of the remote, otherwise it wouldn't turn on under normal conditions. The second power supply produces the needed service voltages used when the set is in use. This second supply is a common failure in many sets and it is generally traceable to poor design and the use of low-quality components of a certain type. Vizio may have a repair or exchange program through their service center. I would guess the cost will be between $50-$150 and you might remove the back panel of the set and look for a smaller board with larger-than-average parts on it and is related to the AC cord coming in. It should be fairly easy to remove and replace as these are often outsourced and just plugged into the rest of the set with dissimilar plugs making it simple to install and reinstall.

Do you have back light when turning on the TV? if you do then just replace the main board should resolve the problem. if you do not have back light, you will need to replace the inverter board(s) depending on your model. The inverter board(s) is located on the left side of the TV facing back of TV. you may have two inverter boards depending on your model. the other is located on the right side of the TV. Both mount vertically.

For the 46" TV, it sounds like the main board is bad.

For the 50" Vizio: is the LED light on?

Does the remote have one power button for on/off .... or, does it have separate buttons ?