As per iFixit and other sites like tvserviceparts, it depends on the Vizio model. Mainstream models you can often replace the screen and even power input board, others you simply cannot without sourcing their brand though.

Example repairable model: https://www.ifixit.com/Guide/VIZIO+TV+Screen+Replacement/120241

Vizio makes it 100% impossible to acquire a replacement of: buttons, bezels, control boards and input boards for intellectual property rights reasons.

In short, unlike other brands, they make it far less easy to repair either by IP restriction or by over usage of glues.