Sorry, as far as region goes I think I mistook this thread for another where the user lives in Hungary. Assuming you are in the US then there are some options that are open to you, but as has been mentioned twice now, by myself and by Dszymborksi, I REALLY don't think the platform is worth putting money into. Not when you could get into a platform that would be MILES better than what you have now, for around 350 bucks. It would cost you at least 200 bucks because they have been out of production and end of life for a good long while now, at least, for a new board of good enough quality to run that CPU without issues, and a used board, given the age of the platform, is a poor and risky investment because most of them are probably not going to last very long and you'll still probably pay around 100 bucks for one. So, it's an option, but it's a lousy option if you ask me.
I would also recommend that unless you are a complete idiot when it comes to doing things of a mechanical nature, there is no need to be paying a technician to do anything for you. I know 14 year old kids and 80 year old men that do this stuff, so if they can, most anybody can. And I'm talking about troubleshooting most problems, replacing hardware like power supplies and motherboards. Installing upgrades, etc.
If you have a phillips screwdriver you can do 90% of what needs done on any desktop computer. If you have that plus a pair of needle nose pliers, you can probably do closer to 100% of it, not counting very advanced testing and things that require equipment none of us are likely to have. Even a basic volt meter can be obtained from Walmart or Harbor freight, if you should ever need one, for less than ten bucks.
So anyhow, back to the issues at hand.
If you want to replace the board, something like this is an option, but could be a risk as I said because you don't know or have any idea how long any used board is going to last, or what it's history of treatment is. It could have been seriously overclocked for five years and now it's ready for the trash pile, and even the seller isn't aware of it. Then again, you could get lucky.
https://www.ebay.com/itm/AMD-ASUS-S...579213?hash=item1a87af8ecd:g:wRkAAOSw5B9dvGh9
Something like this, would be a much wiser investment of your money.
PCPartPicker Part List
CPU: AMD Ryzen 5 2600 3.4 GHz 6-Core Processor ($117.58 @ OutletPC)
Motherboard: ASRock B450M PRO4 Micro ATX AM4 Motherboard ($69.89 @ OutletPC)
Memory: G.Skill Flare X 16 GB (2 x 8 GB) DDR4-3200 Memory ($63.99 @ Newegg)
Total: $251.46
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2019-11-01 15:07 EDT-0400