How can I repair rb433ah?

I would like to know if someone already concert the rb433ah.
For me isn’t a good idea give to an expert, cause I’m thinking in buy a new, but before I want to try concert.

My situation is: I have 2 rb433ah, where one is with a defect on the font, is just trade
the 9576gm and will be alright. But this same board is with the slots of card broken.

But the another rb433ah don’t start. Which is the components that I should change??
I will take of one board for another.

ps.: Don’t is a software problem, neither a font problem.

I wait that you can help me!!
Thanks