Craftsman 1/2 HP Opener
I suspect a recent electrical storm is the culprit but I'll try this anyway. Model no. is 139.53525SRT installed in 1994.
Opener raises door about one foot, reverses and closes. I disconnected the chain from the sprocket so it eliminated any chance that it's attributable to the load on the opener.
It behaves the same way whether you use the wall mounted control or the remote. I checked the limit switches and adjusted the open limit setting and it had no affect. Unplugged the unit overnite and tried the next day...no affect. All gears are in good shape and unit runs normally except for the travel distance problem.
I'm perplexed because I thought the travel distance was controlled only by the limit switches and closing/opening force settings as opposed to the logic board!?!?