There are a lot of parts that can fail.
Testing garage door motor.
In my experience the capacitor is the first to go out then maybe the power board or control board.
A garage door repair company generally charges a national average of 80 for a service call which includes the first hour of labor and service such as testing and inspecting the garage door and opener.
Not every garage door opener has an automatic reversing mechanism.
For example a new spring costs an average of 60.
Since the lack of power supply is a common problem check the wires around the sensor when the led lights are not flashing.
Symptoms include the hum of a garage door opener and its failure to start working or the failure of an air conditioner to cool the room.
If an excessive amount of pressure is required to cause the door opener to reverse the reversing mechanism is considered inoperative our inspectors use a 1 1 2 block to test the auto reverse save your cat test the door yourself.
Testing a garage door opener capacitor is a pretty simple task if you know how to hook up a simple voltmeter.
Apart from labor the garage door repair costs hinge on buying replacements parts.
In 1982 ansi created a voluntary industry standard ansi ul 325 1982 which requires automatic reversing mechanisms on garage door openers sold in the us.
Many times the malfunction can be due to a loose connection or broken wire.
Take safety precautions as usual and follow some pretty fast and easy directions below and you should have no problem getting a reading on your garage door opener capacitor.