The logic board was a common malfunction in the old PowerBooks, but hopefully the unibody MacBook Pros are a little more resistant to failure, but if you have to get a new one, do it yourself. See how to remove the logic board on a MacBook Pro 17" Unibody laptop.
PowerBook Medic is the ultimate resource for Mac computers and electronics repair. They have helpful tutorials on most Apple products including the MacBook, MacBook Pro, PowerBook, iBook, iPhone, iPod, and more, covering topics from disassemblies, to RAM upgrades, to replacement hard drives.
Repair a MacBook Pro 17" Unibody - Remove logic board
In this PowerBook Medic video tutorial, learn how to remove the logic board from a MacBook Pro Unibody. This is just one of the steps for the teardown procedure of the MacBook Pro with Intel Processor. Find more details on taking apart the MacBook Pro (A1287) in the repair guide.