Please note that circuit boards are no longer available for openers manufactured before 1993.
Notes:The letter at the end of the part number is the manufacturers revision number, the higher letter is a newer improved board. Our goal is to have all currently available logic boards in stock for fast delivery. Logic boards are shipped US Priority mail for delivery in 2 -3 business days (In the USA).
Diagram that shows how to find your opener model number
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Download Chamberlain Manuals (with parts
Download Liftmaster Manuals (with parts diagrams) -
Operators Built from 1993-1997 with Billion Code controls with Safety Sensors:
Liftmaster 990LM Surge Protector. Protects any garage door opener from harmful power surges. Door opener circuit boards and other components are frequently damaged by power surges caused by lightening storms. This surge protector has special terminals (colored connectors on bottom - see photo) that connect to, and protect, the Safety Sensors and the wall control station (only used with Liftmaster or Chamberlain openers manufactured after 1994).