Won't power on, no picture or sound

Mark,
Try this first. Not sure, but most Vizio menus within the last 4 years should be close enough to navigate through. It's a little tricky to get to. You highlight picture, then you hit the right arrow to bring up the Picture menu. Go down to Advanced Video (one above Reset Picture Mode) and hit the right arrow again to bring up another submenu. Go down to Backlight Control. There are three options: OFF, DCR and OPC. Both DCR and OPC seem to cause a problem. Try turning this feature to "OFF" and see if the the problem goes away

LG LED TV has no picture (black screen) but still sound ...

www.tomsguide.com/answers/.../led-picture-black-screen-sound-fixed.ht...

My 32' LG LED TV has suddenly lost picture! The sound is all right but the Screen is pitch black. After switching it on the picture flashes for a second and then the screen goes completely black.

LCD Easy Fix (sound but no picture) - YouTube

? 4:52
https://www.youtube.com/watch?v=IBRE1Dcyxp4
Jan 13, 2012 - Uploaded by Clay Whitehead
TV Has Sound But No Picture Troubleshooting Guide - Duration: 2:30. by Repair.com 472,733 views. 2:30. LG LCD TV REPAIR -NO PICTURE ...

Hi, bring to your nearest service center to repair it.

Download the repair book to this TV by net. It will have all details.

Hello, if the model number is correct it's not a projection tv, but an LCD tv. If that's correct, it sounds like a bad main board issue part # is AGF31218501...thanks

check the invertor boards resistors they power the back lights
also check for any capactors that have blown (raised tops) they look little bateries

I have a 3 year old TV with the same problem as shema_ross.

It sounds like to me theat the new lamp is faulty. If there is any pieces of glass in the lamp compartment, remove them so they will not travel and get wedged in places they should'nt be.
Hope this helps,
Skyassoc

that is a common problem with that model you will need the v26 power pwb repair kit and the V26 FMT pwb repair kit. You can get both kits at the following link which includes the replacement capacitors and instructions on where the capacitors are located. Heres the link.
http://servicemanuals.vstore.ca/

1)confirm service # on back of tv 2)Is sound from tv or surround system? 3)suspect bad flyback xformer.