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SOURCE: Vizio m550nv backlight won't work
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
Im having similar problem and with my limited knowledge of lcd tvs and the voltages ALL being good except the pwr on or sw on voltage from the main board to the power supply which tells it to switch everything on Im guessing that something is going wrong on the main board. In the condition where it freezes it (the power on V) which switches everything on i get varied voltages such as 2.5 or 3 or (the normal 5v) and then when nothing powers up (blank screen) i read 0v on pwr on voltage but all my other voltages are corect (24v to inverter, 12 v to main board, 5v, etc.) Im guessing from researching this is that there is in improper voltage somewhere in the main board circuit. I have been unable to find it so i may order another board and post back.
SOURCE: Vizio e701i-a3 problem. When I turn it on the
Very good chance it could have bad diodes. You will have to take the back off your TV and check to see if any have bad soder or need to be replaced
Probably a bad panel. Those vizios are terrible. I worked on a 55" that was 9 months old with the same problem. replaced all the boards, ended up having a bad panel. See if you have voltage on the wires going to the panel. if so, its most likely bad
SOURCE: Vizio E701i-A3 no audio or video have backlighting; should I replace all 3 boards or just main board
Just the main board
If you need further help, reach me via phone at https://www.6ya.com/expert/steven_a67ead41eb5fc62a
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