Onkyo TX-860 does not work

Onkyo TX-860 does not work

I have an Onkyo TX-860.
A while ago the tuner started to stop working.
Everything else was working fine.
Now it no longer turns on as it should, the whole panel and so on. Only some lights.
I would like to repair it because it has been with me for a long time and I want to get it back. Maybe a colleague who has had experience with this model can give me some ideas where to start.
I have the SM
ONKYO TX-860.png