The sticker is on the back panel of the TV, often near the ports. Most smart TVs also show the model code in the settings menu under Support or About, which is easier than pulling a mounted TV off the wall.

What Onkyo TVs & Home Theater manuals cover

Wall mount (VESA) pattern and screw size
Port layout and HDMI eARC
Picture and sound settings
Factory reset
Remote pairing
Power and standby problems

Common jobs

Factory reset

How to factory reset almost anything

Button holds, menu paths and what you lose

Setup & install

Setup and installation instructions

First use, pairing and installation

Specs

Specifications and technical details

Dimensions, ratings, compatibility