How to repair solar panel driver card?

My solar panel driver card final z44n not giving negative voltage on negative point but positive volatage working properly it give a drop some time for a while during the switching of the circuits please help

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negative is usually 0v on any electronics

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You spoke about a z44n Power MOSFET but not fully telling us how its wired.

How about given us the make and model of the board and maybe a few pics so we can see the layout posting them here for us to see Adding images to an existing question

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