I'm assuming that you confirmed that you have 12v on the wiring harness where it goes into the head unit and the ground wire has continuity to the case of the head unit.
If those are not an issue, check the various SMD fuses on the board. There are also circuit board fuses that are printed into the board.
If those are not an issue, check the various SMD fuses on the board. There are also circuit board fuses that are printed into the board.
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