820-1889-A 661-4218 13inch Macbook Core Duo, 1.83 GHz Logic Board with Heatsink A1181 NB-1821W This is a MacBook 13" Core Duo 1.83 GHZ logic board replacement. This is a pull from a working unit and comes with our standard 1 year warranty. This will work in both the black and white MacBook 13" units. This will NOT work in a Core 2 Duo unit, only the CoreDuo. EEE code: WXS,WXW,X0W,X10