I have a Chamberlain Liftmaster Elite Series GDO, none of the remotes nor wall panel work. Checked electricity running from the wall to the opener and is OK. After that here what I have done:

1. Shorten the wall panel and nothing.

2. Shorten the wires leading to the wall panel and nothing.

3. Replaced the wall panel and nothing.

4. Shorten the sensor wires and nothing.

5. Replaced the logic board, using one from a similar opener that works and nothing.

The logic board does not seem to be getting electricity.

Any suggestions??