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https://www.ifixit.com/Guide/MacBook+Unibody+Model+A1278+Logic+Board+Replacement/765
MacBook Unibody Model A1278 Logic Board Replacement - iFixit Repair Guide
This motherboard includes all ports on the left side.
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https://www.newegg.com/p/16J-02UU-000V2
60W Charger Compatible for A1278 MacBook Pro - Fast L-Tip Power Adapter Compatible for Mac Book Air...
Buy 60W Charger Compatible for A1278 MacBook Pro - Fast L-Tip Power Adapter Compatible for Mac Book Air Mac Book Pro 13 inch Laptop (Before Mid 2012 Models)...
https://www.ifixit.com/Guide/MacBook+Unibody+Model+A1278+Subwoofer+&+Right+Speaker+Replacement/766
MacBook Unibody Model A1278 Subwoofer & Right Speaker Replacement - iFixit Repair Guide
Restore sound to your laptop by replacing the subwoofer and right speaker.
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https://www.ifixit.com/Guide/MacBook+Unibody+Model+A1278+LCD+Panel+Replacement/1428
MacBook Unibody Model A1278 LCD Panel Replacement - iFixit Repair Guide
Save money by replacing just the LCD rather than the whole display assembly.
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https://www.ifixit.com/en-gb/products/macbook-unibody-a1278-replacement-battery
MacBook Unibody (A1278) Battery
Replace a battery compatible with the MacBook Unibody model A1278 2 GHz and 2.4 GHz. 56.2 Watt Hours (Wh). 10.8 Volts (V). Part #661-4817.
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https://www.newegg.com/p/2S7-09JY-00009?Item=9SIBE3GKBK8074
Refurbished: OEM MacBook Pro 13" A1278 2012 2011 Genuine Subwoofer and Right Speaker 922-9769 -...
Buy Refurbished: Gadgets MacBook Pro 13" A1278 2012 2011 Genuine Subwoofer and Right Speaker 922-9769 with fast shipping and top-rated customer service. Newegg...
https://www.dhgate.com/goods/994021833.html
Laptop speaker set with tools for MacBook Pro 13.3/15/15.4 inch models A1278 A1286 A1425 A1502...
Laptop speaker replacement set: Includes left and right speakers with a hasp closure for secure installation in MacBook Pro laptops. and Laptop speaker set...