Before opening the unit, verify that the issue isn't a software glitch or protection mode lock: Logitech Z906 Repair & Troubleshooting - JustAnswer
For systems that are unresponsive or showing error lights, the following fixes are widely verified by the repair community: : Turn off the system via the Control Console. Press and hold the Input button for eight (8) seconds. logitech z906 service manual fixed verified
Opening your Logitech Z906 voids your warranty. High voltage inside the subwoofer can be lethal. Only attempt repairs if you are experienced with electronics. Before opening the unit, verify that the issue
±35V to ±42V (Powers the TAS5162 amplifier chips). Logic Rail: +12V (Powers the cooling fans and op-amps). 4. When to Seek Professional Help Before opening the unit