Genuine LiftMaster 050DCJCWFSDMC receiver logic board (printed 050DCJCWFSD; also seen as 050DCJCL5SD) — the Security+ 2.0 DC Wi-Fi board for the LJ8900W light-duty commercial jackshaft operator for sectional doors. It carries the myQ Wi-Fi radio, the yellow learn button and the battery backup circuit. The rolling-door LJ8950W and the DDO8900W dock door operator share the chassis but use their own boards.
Three boards, three operators. Sectional door LJ8900W = this board. Rolling door LJ8950W = 050DCJCWFRDMC. Dock door DDO8900W = 050DCDDOWFMC. The model is on the operator label; the board number is printed next to the learn button.
Specifications
| Part number | 050DCJCWFSDMC (printed 050DCJCWFSD; also 050DCJCL5SD) |
|---|---|
| LiftMaster description | Receiver Logic Board, DC, Wi-Fi, CJO, Sectional |
| Learn button | Yellow — Security+ 2.0, tri-band 310 / 315 / 390 MHz |
| Connectivity | Wi-Fi, myQ |
| Fits | LiftMaster LJ8900W (LJ8900WMC) |
| Condition | Genuine LiftMaster OEM, new |
Which operators use it
| Operator | Board | Parts page |
|---|---|---|
| LJ8900W light-duty jackshaft, sectional door | 050DCJCWFSDMC — this board | LJ8900W parts |
| LJ8950W light-duty jackshaft, rolling door | 050DCJCWFRDMC | LJ8950W parts |
| DDO8900W dock door operator | 050DCDDOWFMC | DDO8900W parts |
| 8500W residential wall mount | 050DCRJWFMC | 8500 parts |
Parts often replaced with it
485LM backup battery · 041B8861 travel module · 041A6104 cable tension monitor · 893LM remote
Is the board actually the problem?
The logic board is the most over-ordered part on a commercial operator. Work down this list before you buy:
| Symptom | Check first |
|---|---|
| Operator beeps and will not run | A slack door cable tripping the cable tension monitor — not the board |
| Dead, no lights | Supply and transformer, then the board |
| Runs on AC but not on battery, or beeps every few seconds | The 485LM battery |
| Lost Wi-Fi / myQ | Router and app setup, not the board |
| Runs a few inches and stops | Door balance, then the travel module, then the board |
| Dead after a storm | The board — fit surge protection with it |
After fitting
Set the travel limits, learn the remotes, re-add the operator in the myQ app and re-test the cable tension monitor and the entrapment protection.
Fit surge protection when you fit the board. Lightning and utility surges are the most common reason a commercial operator board is replaced, and a new board on the same unprotected supply is at the same risk. The MOV kit on the electrical box is the first line; a proper surge arrester on the supply is the second.
Related
LJ8900W parts · LJ8950W parts · DDO8900W parts · all LiftMaster commercial door parts
Not sure which board you need? Send a photo of the number printed on your existing board to parts@gatehousesupplies.com or call 866-965-5599. We would rather confirm it than have you fit the wrong board.
