Logitech Z506 suddenly stopped working can anyone help please? The speakers work fine although 2 of the outputs are no longer the best quality. The sub just stopped working one day though. I have tested the potentiometer and the resistances are as you would expect, the connections all look ok. The only thing I can think of is that the sub isn't getting signal anymore from the amp so maybe pcb failure but I can't see any issues? Is there any way to test? I don't really want to solder unless I Have to but any info would be really helpful please? I have a multi meter and have checked the YouTube video but still can't fix. Thanks