Method for quickly detecting PCB board failure

Making a PCB board is not a simple process to complete the board, just drill a hole and add components. The production of PCB is not difficult. The difficulty lies in troubleshooting after the production is completed. Whether it is a personal enthusiast or an industrial engineer, it is also quite a headache for the PCB board to encounter problems when debugging, just like a programmer encounters a bug.

    Some people have a strong interest in debugging PCB circuit boards. Just like programmers are solving BUGs, there are many common PCB circuit board problems. Common problems include circuit board design, damage to electronic components, short circuits, and components. Quality, PCB circuit board disconnection faults are not uncommon.

Common PCB circuit board failures are mainly concentrated on components, such as capacitors, resistors, inductors, diodes, triodes, field effect transistors, etc., the integrated chip and crystal oscillator are obviously damaged, and the more intuitive way to judge these component failures can be through See with your eyes. There are obvious burn marks on the surface of obviously damaged electronic components. Such failures can be solved by directly replacing the problem components with new ones.

Of course, not all damage to electronic components can be observed with the naked eye, such as the resistors, capacitors, diodes, etc. mentioned above. In some cases, the damage cannot be seen from the surface, and it needs to be repaired with the help of professional inspection tools. Commonly used inspections include: multimeters, capacitance meters, etc., when it is detected that 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 and check to see if it is normal.

If the component is broken, it can be detected whether it is observed with the eyes or detected by the instrument, but sometimes when we give the components on the PCB, we will encounter no problems, but the circuit board will not work Case. Many newbies have no problem with this kind of problem, and can only make a new board or buy one. In fact, when encountering this situation, many times it is the component during the installation process, due to the coordination of various components, the performance may be unstable.

In this case, the instrument can no longer help. You can try to determine the possible range of the fault according to the current and voltage, and try to narrow it down. Experienced engineers may be able to quickly determine the fault area, but which specific components are broken. Not 100% sure. The only solution is to try to replace the suspect component until the problem component is found. Last year, my laptop ’s motherboard was flooded with water. When I repaired it, I encountered a failure that was not detected. During the repair process, I replaced three components, namely the power supply chip, diode, and USB charging component. The socket, you can charge the device in the off state), and finally through a wave of detection and inspection to replace the suspicious chip, it was finally determined that a component on the side of the South Bridge chip was shorted.

All of the above are actually problems with electronic components. Of course, since PCB circuit boards serve as the footholds of components, circuit board failures must also exist. The simplest example is dead tin plating. Due to manufacturing process reasons, During PCB corrosion, disconnection may occur. In this case, if the wire cannot be repaired, it can only be solved with a thin copper wire.