Hi,
Well, if the system does turns on, it could be just an OPAMP its one of various little 8-pin ic's that are in the pre-amp section that got fried, STAGEPASS YAMAHA Powered mixers runs with a switchmode power supply, if the power amp section has any problem the power supply does not turn on, if you can add further details like if it does turn on, the green light turns on, do you hear something in the speakers, the more the info the best i can help you.
Paul.
SOURCE: I had major static sounds from my yamaha stagepas
Chances are there is nothing wrong with the mixer. IF you accidentally turned on Phantom power, that would cause the problem. Phantom is ONLY used with condenser mics and a few DI boxes. Turning it on can create noise unless balanced lines are used everywhere.
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