HOW TO FIX IF SUBWOOFER IS OK BUT CONTROL UNIT NOT WORKING : Attempt 1) Turned on unit, got zero lights. Tried the Logitech Factory Reset (Turn off control unit, then hold the input button for 8 seconds) and saw 2 input lights turn on, but no sound. Tried this procedure several times, and got 3 inputs lights, then tried again, now with 4 input lights on, but again no sound or other lights. Attempt 2) Disconnected power to subwoofer for 30 seconds, and tried Factory Reset again, with same results as Attempt 1, but now with 3 input lights on. Attempt 3) Disconnected cable from Control Unit to subwoofer, waited 30 seconds, tried Factory Reset yet again, with same results as Attempt 1. Attempt 4) Disconnected power to Subwoofer and Control Unit cable. Waited 60 seconds and tried Factory Reset again, and got same results as Attempt 2 - No Joy. Attempt 5) Found this video, and although was not that helpful, tried Attempt 4 yet again several more times and on the last try, this time it works, and my Z906 is back to normal ! Lesson Learned : You may have to power the subwoofer down and disconnect the control cable and then try the Factory Reset Proceedure more than a few times to get your Z906 back into its working state !
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