Question about Samson dB300A 2 Way Powered PA Speaker, 300 Watts

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Hi, I have a samson db300a that isn't working. I've tested the speaker and the input circuit and both of these are fine (tested by unplugging them from the main board and plugging them into another db300a's board/speaker etc) and have limited the problem to the main board though nothing appears loose, burnt or broken in any way. Should I just get a replacement board?

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