Since the lack of power supply is a common problem check the wires around the sensor when the led lights are not flashing.
No power at fotocell garage door.
Many times the malfunction can be due to a loose connection or broken wire.
1 the transformer has failed due to a power surge.
Once the power comes back on you must reconnect the garage door opener in order to take full.
Sweep the garage floors and look through the sidings to ensure that there are no objects to obstruct the door.
Disconnect the power to the garage door.
Disconnect the emergency release cord.
During a power outage the garage door must be manually opened and closed in order to get in and out of this area of your home.
If you have an automatic garage door then you have to disconnect the door sensors.
Flip the circuit that controls the power to the garage door or disconnect the garage door plug from the wall.
Also how to manually close and disconnect.
Here is what may cause your garage door opener to not power on.
How to fix a garage door s photo eye.
Look for obstructions adjust the sensors to get a solid green light.
2 the glass fuse on the circuit board has blown or popped.