The logic board on a garage door is a vital part that contains control components that enable your garage door opener and remote to work correctly. When it goes bad, you can replace it yourself with a logic board (also called a circuit board) made specifically for your model garage door opener. The LiftMaster 050DCTBMC logic board from Garage Door Supply Company is compatible only with the Wi-Fi-enabled LiftMaster 8550W garage door openers. Please note that this replacement 050DCTWF circuit board will not work with the LiftMaster 8500 model without Wi-Fi, and it cannot be used to upgrade non-Wi-Fi models. Product Highlights: