I should be able to find the problem.
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Hi ZOUjiarui,
I do not see the PCB solder side and don't know how your heatsink is connected (or not connected) to the circuit. But between the MOSFET and the heatsink is an electrical isolation missing. Usually there is a Silicon pad and a srew isolation mount between the MOSFET and heatsink.
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Dear Masters, my Surf Pi PRO could not work on the red soil. It could not be stable on the dry soil wall. It was unable to use. It has been disturbed by red soil, the sensitivity is toned to the smallest, but it is not almost detected.To metal, its effect is better than the simplest pirate PI
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