Fm2+ board

Power pin at the Front Panel Audio Header has 0,8volt is this ok? no 12v if this is troendes - it should star, but does not. is it the board?

The first thing I would check is the PSU. Try a different one and see what happens.
If the result is the same then I would start with a new board, make sure you can
return it if it turns out not to be the issue.

If a new board does not solve the issue them I would look at an upgrade instead
of replacing the CPU, unless you can get a cheap used replacement. Something like
an Athlon 200ge or Athlon 3000g and a decent cheap b350 or b450 board will outperform
the 7860k but you will also need DDR4 RAM so the cost may be a bit higher. The
advantage of this is that you can upgrade the CPU and add a GPU down the line,
all the way up to a Ryzen 9 3950x. Alternatively you can throw in a Ryzen 5
3400g or Ryzen 3 3200g and not bother with a GPU at all. I have even seen mention
of Ryzen 7 APUs on the horizon but nothing I would consider concrete just yet.