We've checked the sensors, power, changed the RPM sensor and the door still wont' open. When you hit the remote it makes a sound, not the motor, but it wont' engage the door to open. What else can we check?
When you hit the button, your opener logic/control board sends a signal to engage a capacitor (or two, depending on which model you have) and the capacitor/s then engage the motor.If you are hearing something when you hit the button the relay on the board is not engaging properly and you are just hearing it trying or you are hearing that relay close but the capacitor/s are not transferring power to the motor.The easiest way to determine what is happening is to test if power is reaching the motor when you hit the button or find the wires off the board going to the capacitor/s and test for trigger voltage there. But the capacitors hold enough voltage to hurt you badly so if you have any reservations or doubts you may want to consider consulting a professional.Looking at the parts illustrations in your Owner's Manual or on the Sears PartsDirect site will give you a better idea of where those components are and the best spots to check them.If what you are hearing is the motor actually engaging but the door is not moving then you likely have a failure at the worm gear/sprocket assembly which is actually more common than a motor or capacitor failure.
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