What are the steps and methods for PCB circuit board debugging?

For a new PCB prototype, novices often encounter some difficulties in debugging, especially when the prototype is relatively large and there are many components, they are often unable to start. So, what are the steps and methods for PCB circuit board debugging? 1. Board surface observation and resistance check First of all, it is necessary to roughly observe whether there are problems on the board, such as whether there are cracks, short circuits, open circuits, etc. If necessary, check whether the resistance between the power supply and the ground wire is large enough. 2. Install modules with independent components. When you are not sure that they work properly, it is best not to install all of them, but install them part by part, so that it is easy to determine the PCB fault range. 3. Check the output voltage of the power supply Generally speaking, you can install the power supply first, and then power on to check whether the output voltage of the power supply is normal. When powering up, consider using an adjustable regulated power supply with current limiting function. 4. Preset overcurrent protection current First preset the overcurrent protection current, and 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 over-current protection and other problems during the upward adjustment process, and the output voltage has reached normal, it means that the power supply is normal. 5. Install other modules and power-on test. Gradually install other modules. Each time a module is installed, power-on and test it to avoid over-current and burn out components due to design errors or component installation errors. The above are the steps and methods of PCB circuit board debugging detailed by professional PCB manufacturers. Have you mastered it?