Clarify what you are talking about. Do you mean a motherboard or a kind systems management board? Also, there is not just some text files to edit to have this working. There is also no precise recipe to get your stuff running again.
Try it on some testbox and write down the actions you do to get it working again. If you are lucky, there might not be much to do after replacement.
Have working backups of the machines you work on.

Ask an experienced co-worker to assist you or assist him. Read the hardware documentation for such service tasks if available, get familiar with your hardware and Linux.