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2x Speaker amps modules not working

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stuee

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Hi I have 2 EV speakers zxa1 very expensive speakers, 1 of them 6 months ago stopped working with no power. now the other one has power but no sound at all.
The power off one keeps blowing the 4a fuse instantly.

The other is just no audio, ive tried different inputs and microphone and not even a crackle.

Is there anything i can test or try? I was going to test the mosfets but was reading you cant test in the board.

Here is all the details for the modules.
**broken link removed**


Any ideas or suggestions would be appreciated.
Thanks
 
time to tear down both and compare power loss components.
 
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