When the picture is dark, show a torch light on the screen from a safe distance. If you can see the picture, the backlight is the problem. Anyhow, it is better to show it to a qualified service technician.
SOURCE: Half of the screen is black and doesn't display the picture
Send it back this appears to be a major failure
SOURCE: Screen powers off and power indicator goes out after ~30 minutes
Your message is pretty old but I'll give you my un-copywrited spiel anyhow;
If it just fails to turn on, the
main power supply is probably at
fault and without some technical background and a couple of test instruments,
you will not be able to do the repair yourself.
What you can do though is; unplug the set, let it
stand overnight or at least several hours, remove the back panel and look for a
separate board with mostly larger components on it; it will have a ferrite core
transformer on it and several larger capacitors which are cylindrical and
mounted vertically to the board.
Before touching anything inside,
especially on that board, allow several hours to be safe since the larger
capacitors can hold a painful voltage charge for some hours.
If you see signs of overheating
such as discoloration of the board material, it may not be repairable but if
you can find a part number on the board, you might be able to buy the power
supply and install it yourself.
If there are no signs of heat
damage to the board, there may be companies offering to repair it as a
subassembly instead of repairing the whole set which could be much more
expensive.
If you choose to replace or have it done, the power supply still may not be at fault since most
are capable of switching on and off if a downstream problem is causing an
overload.
SOURCE: Our VX42L display goes black after an hour use but has sound
I would check to see if there are any firmware updates for your tv on Vizio's website. This usually involves downloading the update onto a usb stick and turning the tv on with the usb stick in the tv's usb port.
Before picture/sound is shown on the tv, the source and tv talk to each other over HDMI to make sure there's no piracy going on (don't you just love DRM?). If the source gets a strange response or doesn't get a response fast enough, it may assume that something illegal is going on and cut the connection to the tv.
SOURCE: How to reset tv. Have sound but black screen
LCD's use a colorful crystal see through display which only visible when light is shining through it. if you have sound and no picture it's always a faulty PSU. Very easy to change out actually.
SOURCE: Vizio m550nv led lcd tv. Problem began a couple
I had same problem. Unplug set for 10minutes then plug it in and let it go thru it's startup routine.
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