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Hi, welcome to Just Answer. My name is ***** ***** I look forward to helping you! If the board has failed again after a very short period, you likely have a short or poor connection in the wiring that is causing excess current to be drawn and damaging the board. Can you post a picture of the burn spot, please?
Thank you! That is a pretty high current burn, it arced pretty good! I suspect something is shorted on the left side inverter board and it may have caused the failure of the power board. What happened to the original board, the same thing?
If everything looks good, it is going to be difficult to know what caused its failure.
Yes, something is shorted to ground, it could be on that board or another part.