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Making FCB multilayered boards is not simply a process to complete the boards. It is good to drill a hole to make components. It is not difficult to make a PCB multilayer circuit board. The difficulty lies in troubleshooting after the completion of manufacturing. Whether you are an individual enthusiast or an industry engineer, you also have a headache when you encounter problems with PCB debugging, just like a programmer encounters a bug.

commonPCB circuit boardThe faults are mainly concentrated in components Above, the obvious damage of integrated chips and crystal oscillators, such as capacitors, resistors, inductors, diodes, triodes, FETs, etc., can be observed through the eyes. The surface of electronic components with obvious damage has obvious burning marks. Such faults can be solved by directly replacing the faulty components with new ones.

Of course, not all damage of electronic components can be observed with the naked eye. For example, the resistance, capacitance, diode and triode, etc. mentioned above, in some cases, the damage cannot be seen from the surface and requires professional inspection I tool is used for maintenance. Common inspection uses include multimeter, capacitance meter, etc. If the voltage or current of an electronic component is not within the normal range, it indicates that there is a problem with the component or the previous component. Replace it directly and check to see if it is normal.

If a component is broken, it can be detected either by eye observation or by instrument detection. However, sometimes when we install components on a PCB, we encounter the situation that the problem cannot be detected, but the circuit board cannot work normally. Many novices have no choice but to make a new board or buy one. In fact, in many cases, the performance of components may be unstable due to the coordination of various components during installation.

In this case, the instrument has been unable to help. You can try to judge the possible range of faults according to the current and voltage, and try to reduce it as much as possible. An experienced engineer may be able to quickly determine the fault area, but it is not 100% sure which specific component is broken. The only way is to try to replace the suspect component until the problem component is found. Last year, the main board of my laptop was flooded. When I repaired it for the master, I also encountered a problem that could not be detected. During the maintenance process, I replaced three components, namely the power supply chip, the diode, and the USB charging component (that is, the blue socket of the laptop, which can charge the device when it is turned off). Later, I replaced the suspect chip through one wave detection and troubleshooting, and finally determined that a component near the Nanqiao chip was short circuited.

All the above are actually problems of electronic components. Of course, since PCB is the foothold of components, there must be circuit board failures. A simple example is dead tin plating. Due to the manufacturing process, wire breakage may occur during PCB corrosion. In this case, if the wire cannot be patched, the problem can only be solved with fine copper wire flying wire.

When PCB faults are not obviously damaged, it is really troublesome to find them. In the process of troubleshooting, there will be a sense of dedication. After finding the problems, there will be a sense of achievement. Programmers are in such a mood to solve bugs. I often like to check some boards that are difficult to repair, which is probably the happiness of HDI multilayer board engineers.