The front panel has no light at all. But if I press the Power button, it gives 3 beeps. Also, if I press and hold the Control Lock for 3 seconds, it would lite up. So definitely there is power into the front control panel. Do I have a bad MMU which causes the Front Control panel to blank out? How do I test the MMU?
Answer Hello Dinh. You will need to check and make sure the wires going to the user interface are good and the connections are good on the unit. It sounds like the board powering the user interface is good, if some of the buttons are working. Based on the information you provided, it sounds like the user interface W10283493 is the issue with the unit.