mini display port doesnt work.

I do not think it would be a good project for the average DIYer - and never a novice.

Removing and replacing logic board components requires special tools and lots of practice (It's not like soldering a lamp cord or speaker wire). A vendor who rebuilds logic boards, or a computer/small electronics shop may have the skill, equipment and parts but the "shade tree" DIY fix would be a complete logic board replace (also an advanced repair). You could remove the logic board and save that expense if you feel up to it.

If this answer is acceptable please remember to return and mark it.