Want to return my Vizio TV to factory settings but controls are unresponsive.

Hello, thank you for using Howly.
It won't respond to pressing any buttons on your remote control?

Customer Replay

I got to the point where it invited me to return to factory settings. I said, 'Yes', and nothing happened. Picture is a mess. Sound is fine.

How long has it been since this issue emerged?

Customer Replay

A few days. I've had the set for some years and it has been wonderful!

Have you tried unplugging your TV for 60 seconds, then plugging it back into the outlet?

Customer Replay

I will do that right now.
Done and done. Shall I turn the set back on?

Yes, please

Customer Replay

It comes up reluctantly, looks great for a minute or so and then turns itself off!

Got it
Could you tell me its model number?
It should be printed on the factory sticker

Customer Replay

M550SV

Let us try and factory reset it
Please press the MENU button on your remote.
Does the menu appear on your screen?

Customer Replay

Yes, and then the set turns itself off!

Is there a control panel on your TV that looks like the following?

Customer Replay

Tell me more about it. Is it hardware with knobs on the right side of the back of the set?

Yes, but not necessarily on the right side
The buttons could be at the bottom or facing sideways

Customer Replay

The buttons I found are on a small panel with an on-off switch, volume control, input button and channel selection.

Yes, that is it
Please carry out the following steps:

Turn on your TV
Immediately afterward, hold down the VOLUME DOWN button and INPUT button on the panel for about 15 seconds
After about 15 seconds, you should see a message on your TV screen that says "to reset, hold the INPUT button for 10 seconds"
Hold the INPUT button for 10 seconds as advised, and the factory reset will begin

Customer Replay

great. how long does it take to fully reset?