" wrote in message
...

On Mar 6, 5:02 pm, "Charles" wrote:
No joy on finding a schematic for a LiftMaster control board. Thought I'd
ask here.

The remotes (4 of them) work flawlessly to open the door. They also work
to
close the door, but only after the built-in overhead light turns off.
That
takes about 2 minutes.

Checked the obvious for the beam sensor: sensor obstruction, sensor
wiring,
sensor lenses, sensor alignment. The wall switch always works.

Any ideas?

Thanks!

Unscrew the overhead light and see what happens and let us know.

No effect.