Thanks for your help Amstaff, I found this board https://reconingspeakers.com/product/klipsch-sub-12-synergy-amplifier-119512-euro-version-230v/
I think it will be easy to replace it by myself but question is did the speaker still works perfectly after this board burn? it looks like brand new...
Can I get an easy answer before spend around 230 US dollars to get it?
Thanks for your help again,