PCB board debugging method:
For the new PCB board that I just got back, we must first observe whether there are any problems on the board, such as whether there are obvious cracks, short circuits or open circuits. If necessary, check if the resistance between the power supply and the ground is large enough.
For a newly designed circuit board, debugging often encounters some difficulties, especially when the board is large and there are many components, it is often impossible to start. But if you master a reasonable set of debugging methods, debugging will be more effective.
PCB board debugging steps
1. For the new PCB board that has just been taken back, we must first observe whether there are any problems on the board, such as whether there are obvious cracks, short circuit or open circuit. If necessary, check if the resistance between the power supply and the ground is large enough.
2, then install the components. Modules that are independent of each other, if you are not sure that they are working properly, it is best not to install them all, but to install some of them (for smaller circuits, you can install them all at once), so that it is easy to determine the fault range. When you have problems when you are not getting it, you can't start.
In general, you can install the power supply first, and then power on to check if the power supply output voltage is normal. If you don't have much control when powering up (even if you have a great grasp, it is recommended to add a fuse, just in case), consider using an adjustable regulated power supply with current limiting.
First, preset the overcurrent protection current, then slowly increase the voltage value of the regulated power supply, and monitor the input current, input voltage, and output voltage. If there is no overcurrent protection and other problems during the upward adjustment, and the output voltage is also normal, the power supply is OK. Otherwise, disconnect the power supply, look for the point of failure, and repeat the above steps until the power is normal.
3. Next, gradually install other modules. Each time you install a module, you can test it on power. Follow the above steps when powering up to avoid over-current and burn out components due to design errors or/and installation errors.