My key fob stopped working a few weeks ago so first thing I did was replace battery. Even tried 2 new batteries and even installed them upside and still not working. No light. Does anyone have any suggestions as to what I should look at on the transmitter? It looks fine but it is not working. Solder points, etc.?

 

I had one of the legs of the button break off the circuit board once. Pretty easy to resolder it. You'll need to disassemble it and inspect closely.