When a MacBook has decided to no longer boot, or is overheating or crashing regularly, there is typically some sort of problem with the logic board. The logic board is the main component inside the MacBook's shell, containing all of the various chips and processors that allow the MacBook to function as a computer. Logic board parts can be ordered online if the MacBook is in need of repair - but it can be a bit tricky to identify which one is the correct model for your MacBook. Here are a couple of tips to find out which replacement logic board you need.
The easiest way to determine which logic board is inside the MacBook is through the MacBook's model number. As Apple prides itself on its designs, most MacBooks don't include any form of identification markings on the outer shell itself, so the model number must come from either the MacBook's box or the receipt from the original purchase. Once you have the model number, which will look something like “MA2545/A”, you can simply do a search online for the replacement logic board that you need. If you can't find the original box or receipt for the MacBook, you'll need to use a different method.
If the MacBook will boot in to OS X, or it's stamped on the bottom of the MacBook, the serial number can provide a wealth of information from Apple - including the model number. In the “About this Mac” window available in the Apple menu, the serial number will be displayed along with some other information about the computer. If it's not on the bottom of the MacBook, try checking inside the battery bay by removing the battery and looking around. Many different models of MacBook contain the serial number in this area. Once you have the serial number, there is a tool available on the Apple website where it can be entered to receive the model number and other information about the MacBook.
Users who are deft with tools and unafraid of the inside of modern electronics can also find out the model of logic board inside their MacBook by taking the MacBook apart. Since the external MacBook assembly differs from model to model, if it's unclear how to get the external shell off of your MacBook it's best to search around online for some assistance. Breaking or warping the MacBook's shell isn't going to do you any good, so take care with disassembly and reassembly of the MacBook. Once the shell is off and the logic board is exposed, you will be able to identify it by the different chips on the board and other labeling.
Although Apple didn't necessarily make it easy to identify which logic board to pick up if yours isn't working anymore - it's still possible with a little work. As long as you can figure out the model number or get the logic board exposed inside the MacBook, you can determine which part to order to get the MacBook working perfectly aga
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