I have a 65 inch Vizio. Model d650i-b2. It won't turn on, no startup lights, nothing. Just acts as if it's not even plugged in.. what could be my problem? Thanks

try removing batteries from remote then unplug tv for a few seconds plug back in reinstall batteries then turn on from reset in rear lower left of tv

If it will not turn on and the power light doesn't even come on then it's very likely dead, even though it's only three years old.

If that was my gizmo, I'd take it to a repair specialist.

you can search for step by step on youtube

It is hard to say but most likely you need a new main board for that TV especially if the sound goes out after it warms up

with the green issue I would think main. t-conns bad too. are you sure its not cable box ? we have had many with green picture issue and sound loss

https://support.vizio.com/s/article/ka61a000000DWK4AAO/D650i-B2-Model-Information?language=en_US

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.

Official VIZIO Support

Fault to the main power supply regulator section. Either it will be a separate board, or the part of main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electro-medical.blogspot.com/
http://electronicshelponline.blogspot.com/
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.

The resolution for TV's is auto sensed by the content being sent to it.
If you are playing a 720p file, you cannot make it 1080p. 720p vs 1080p Can You Tell The Difference Between HDTV Resolutions