Welcome. My name is ***** ***** would be glad to assist.
If the light is blinking on the wall push button, something is wrong with the button, the wiring or the main board.
Remove any light bulbs from the opener first.
Then, Disconnect the wall button from the opener terminals.
Then connect a short wire to each of the terminals which you just removed wires from.
Strip the loose end of each wire so you have copper wire showing.
Take the loose end of those 2 wires and touch them together and see if the opener reacts.
That will eliminate the button and wiring right off .
There is no way to test the main logic board unfortunately.
But if nothing happens, its is the only item left on the control.
They are available and can be ordered from several on line sources if needed and I would be glad to find one for you.
Keep me posted on the status