Why will my vizio m550nv turn on but no picture or sound?

That isn't a timing control board issue, see if you have PSON voltage for starters, if you do then test the various power supply voltages, it could be either the main or power board giving issues, but I would bet on the power supply is bad since the logo comes stays on

I would to try a new main board first.

EASY HOW TO FIX LED Vizio TV- no power - YouTube

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http://www.shopjimmy.com/vizio-0500-0612-0030-power-supply-unit.htm See the picture The bottom right 1/4 of the picture has some black cylinder shaped parts that fail.

If you can see the Logo; the back light is there. Contact any service technician; Sounds like main board fault. In most cases, a firmware update might help you. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/

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 is the only way to get rid of the orange light:

• Connect
• reset
• Blurr
• installation
• trouble
• settings
• service menu
• set
• channel
• parts
• instructions
• troubleshooting
• remote
• connection
• drivers
• blue
• repair
• manual
• bug
• CODES

Problem with Vizio L32 32 in. HDTV LCD Television
how do i turn off the orange light on the vizio tv, it won't go off after the tv is turned off?

Posted by meg_car on Jul 08, 2009

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Vizio TV Repair Power supply troubleshooting Picture problem Sound problem

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Solutions (2) Best Solution That little fella is only turned off by unplugging it. If all those little lights in America could be turned off we could do with one less nuclear power plant. If unplugging it is not an option, my wife's solution is to cover it with a piece of black tape.

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• Answered by Sgt Fluffy Over a year ago
  

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remove all screws on the back of the tv, carefully pull off back cover. you will see two circuit boards one on the left (Power) and one on the right (Video) on the Video board there is a small plug on the right side with a yellow, white and red wire going into a small white connector. the red wire is what controls the orange light on the front. now that the plug is pulled turn it over and you should see a small white plastic piece that holds each metal connector on the end of the wires in. pry this piece of plastic up for the red wire and pull at the same time, the wire will come out of the connector. now tape the metal connector with electrical tape and tuck it behind something or tape it to the chassis. plug your connector back in. put the rear cover back on. now your tv will only show the vizio logo in white when you have the power on. If you wish to disable the logo for both orange and white just disconnect the white plug completely.

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