Probably the better thing about a portable Mac is the shipping is less
than a desktop, for hardware repair. And the small lighter unit is best
sent intact to a repair shop for testing; they could then offer a cure of
its ailments to include a repair of the original logic board.
Depending on your location (mentioned earlier) may limit your options.
I've had good experience with portable Mac computer by sending out
across the continent from AK to NC. A shop in that vicinity has all the
workstations and skilled knowledgeable labor to restore most Macs.
If you are in the US or north america, and want to restore the running
condition of an older Mac portable, you could try powerbookmedic,
wegenermedia, or some of the others out there. Also ifixit repair guide
listings include some of these. Parts are the rub. A previously repaired
logic board, plain and in a box, invites damages in excessive handling.
So the unit intact is best sent for evaluation and estimate. Wegener
is one that now sends out a box. (When I first sent Mac portable there
I made a super-box and padded it well. But didn't get the box back.)
In any event...
Good luck & happy trails! 🙂