Hi welcome to just answer.
Have you tried a different power outlet?
Ok, do you know if power gets on the system?
Are you comfortable taking the system apart for inspection.
There are two problems:-
1. Fuse gone bad and can be replacedone
2. Transformer is bad
The only manual available is users only. No service manual.
If you have electronic measuring instruments you can measure ac voltage at the power cord.
Ok let me know the results
Thanks for the update. I am not sure about the availability of the board. How old is the system? Is it out of warranty
I think you should look into get a used unit from eBay and use some of parts. I saw few that are under 40. This might be your best option.