What is fried dc-in board?, What is fried dc-in board?

Hello, i have a powerbook g4 12 1.33ghz and i've read about them having problems with frying Dc boards. What is this and how can I prevent it from happening to mine?

You can get one at this link if you really want to be prepared for the worst. They have the take apart instructions for just about any Mac too.
http://www.ifixit.com/Mac-Parts/PowerBook-G4-Aluminum-12%22#0-DC+In+Boards

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