For a newly designed circuit board, debugging often encounters some difficulties, especially when the board is large and has many components, it is often difficult to start. But if you master a set of reasonable debugging methods, debugging will be twice the result with half the effort. For the new PCB board just brought back, we must first roughly observe whether there are any problems on the board, such as whether there are obvious cracks, short circuits, open circuits, etc. If necessary, you can check whether the resistance between the power supply and the ground wire is large enough.
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