Common PCB circuit board fault detection method


Common PCB circuit board faults are mainly focus on components, such as capacitors, resistors, inductors, diodes, triodes, field effects, etc., the integrated chip and the crystal oscillator are obviously damaged, and the more intuitive method of judging the fault of these components is to visually observe . The electronic components with obvious damage  it surface has obvious burning marks. Such a failure can be solved by directly replacing the defective component with a new one.

PCB circuit board fault detection

PCB circuit board fault detection

Is Suspected damaged components? Actually this component is not damaged.


It’s certain not all electronic components can be visually observed, such as resistors, capacitors, and triodes. In some cases, damage cannot be seen from the surface and requires professional inspection tools to repair. Commonly used inspections tools include: multimeters, capacitor meters, etc., when it is detected that the voltage or current of an electronic component is not within the normal range, indicating that there is a problem with the component or the previous component, and directly replace it and check to see if it is normal.


Board with no damage in appearance and no faults can be inspected out.

If the component is broken, which can be observed by the eye or by the instrument. However, sometimes when we assemble components on the PCB, we cannot find problems, but the board will not work properly. Many newcomers have no ideas with this kind of problem.  In fact, in many cases, components are in the process of installation. Due to the coordination of various components, performance instability may occur.


Circuit board loop division

In this case, the instrument can not help any more, you can try to judge the possible fault range according to the current and voltage, try to narrow down, experienced engineers may be able to quickly determine the fault area, but it’s not 100% certain which specific components are broken. The only solution is to try to replace the suspected component until the problem component is found. Last year, my notebook motherboard was flooded.During repairing, I also encountered the failure to detect the fault point. In the repairing process, I replaced the components three times, which are the power supply chip, diode, and USB charging component. Finally, it is determined by many times detection and replacement of the suspected chip, and finally it is determined that a component on the side of the south bridge chip is short-circuited.


Circuit board flying line

The mentioned above are actually the problem of electronic components. Of course, since the PCB circuit board is the foothold of the components, the circuit board failure must exist. The simplest example is to die the tin-plated part, due to the manufacturing technics, There is a possibility of wire breakage during PCB corrosion. In this case, if you can’t make up the circuit, you can only solve it with a thin copper wire.


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