When checking the functionality of a soldered circuit board, it is crucial to follow a thorough step-by-step process before applying power. Starting with verifying correct connections, attention must be paid to the accuracy of the schematic diagram.

The first assessment focuses on the power supply of the chip and the network node labels, ensuring no overlapping nodes. Additionally, the original package, model, and pin order are checked, especially for non-pin packages. It is important to assess correct wiring, watch out for incorrect, missing, or excessive wiring.

There are two ways to check the wiring: according to the circuit diagram or by checking the circuit with the component as the center. Preventing short circuits is essential. Prior to powering on, measure the input impedance of the power supply to avoid short-circuiting, which could lead to severe consequences.

A 0-ohm resistor can be used as a debugging method in the power section. Protection circuits, such as recovery fuses, should be added in the circuit design. Ensure proper installation of polar components and conduct open circuit and short circuit tests. Before conducting the power-on test, it is necessary to observe any abnormalities and conduct static and dynamic debugging.

Static debugging involves a DC test with no input signal or only a fixed level signal, whereas dynamic debugging adds signals to the input end of the circuit. It is crucial to use instruments for observation and ensure that the various indicators of the functional block and the entire system meet design requirements. Any necessary corrections to circuit parameters should be made.