Circuit board debugging: for a new design of the circuit board, debugging often encounter some difficulties, especially when the board is larger, more components, often do not know how to start. But if master a set of reasonable debugging methods, debugging will be twice the result with half the effort.
For the new PCB we just got back, we should first make a general observation on whether there are any problems on the board, such as whether there are obvious cracks, short circuit, open circuit and other phenomena. If necessary, check to see if the resistance between the power supply and the ground wire is large enough.