Im no mechanic but I have had a few problems over the years with garage doors. Firstly you need to release the door from the overhead track you should have a cord hanging down and by pulling this should disconect the door and allow you to manually lift the door. By doing this you will eliminate the posibility that there is something jamming the track or that it has for some reason jumped out of time. Try it up and down a few times be carefull coming down its heavy. You may also want to check that theres nothing breaking the lite on the way up like weather stripping. Hope these help

Sounds like a bad wall control. It is easy to eliminate this possibility by momentarily shorting the two wires together. There is more than one type of wall control. Without knowing the model it would be just a guess on how to remove it.

There are two completely separate possible problems. Problem #1 is a noisy LED (not, sound noise, but electrical noise that makes radio interference) that makes it more difficult for the radio signal from remote to base to work. Problem #2 is a capacitor on the board that wears out with age that affects the wireless capabilities. The LED bulb doesn't cause a bad capacitor or vice versa. These are cumulative issues, but unrelated in cause. So, it's slightly possible that a combination of these two issues could exist where the cumulative effects of both are enough to make it not work. But, one doesn't cause the other. Test #1 is to just temporarily remove any bulbs from the opener and see if that makes a difference in how the wireless remote works. If it does, then you probably just need a better bulb. If it doesn't, then the next most likely cause is the capacitor. For my opener, the bulbs made no difference. Mine was fixed by replacing the capacitor and is now working fine (at 25 years old).

The problem I have is my door wont open at all. Neither the remote nor the wall button will budge it. The wall unit and the overhead opener seem to be communicating, since the lightbulbs are flashing, and turn on and off when told to. The remotes seem to have no affect at all. I replaced the chain onto the sprocket assemby and was adjusting the up and down on the main unit, Unit does nothing now when I press button on wall, is it possible to have adjusted the up/down too much to make unit not operate?Anyone have any ideas why my door won't work at all? I would expect the motor to at least chug or something, but...nuthin! Just flashing lights when i press the wall buttons. Sears Model 139.53975SRT1. HELP!