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PCB Tech

PCB Tech

PCB Tech

PCB Tech

Common detection methods for PCB circuit board failures

Components on PCB

Common PCB circuit board failures are mainly concentrated on components, such as capacitors, resistors, inductors, diodes, triodes, field effects, etc., integrated chips and crystal oscillators are obviously damaged, and the more intuitive way to judge the failures of these components can be through the eyes To observe. There are obvious burn marks on the surface of the electronic components that are obviously damaged. Such failures can be solved by directly replacing the problematic components with new ones.

Suspected of damaged components? Actually, this component is not damaged

Of course, not all electronic component damage 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 the voltage or current of a certain electronic component is detected to be out of the normal range, it indicates that there is a problem with the component or the previous component, directly replace it and check to see if it is normal. PCB circuit boardmanufacturer Benlida Circuit will talk to you in detail today about the detection methods.

1. Circuit boards without any damage in appearance and failing to be detected

If the component is broken, it can be detected whether it is observed with eyes or detected with an instrument, but sometimes when we give the components on the PCB board, we will encounter problems that cannot be detected, but the circuit board does not work properly. Case. Many novices will have nothing to do with this kind of problem, or make a new board or buy one. In fact, in this situation, in many cases, the performance of the components may be unstable due to the coordinated work of the components during the installation process.

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2. the circuit board circuit block division

In this case, the instrument is no longer helpful. You can try to judge the possible range of the fault based on 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 which of the specific components is broken But it is not 100% sure. The solution can only try to replace the suspicious component until the problem component is found. Last year, my laptop motherboard was flooded, and when I was repairing it to the master, I also encountered that it could not detect the fault, and during the repair process, I replaced three components, namely the power supply chip, diode, and USB charging component (that is, the blue notebook). The jack can be used to charge the device when it is turned off). In the end, the suspicious chip was replaced through waves of detection and investigation, and it was finally determined that a component on the side of the South Bridge chip was short-circuited.

3. the circuit board flying line

The above is actually the problem of electronic components. Of course, since the PCB circuit board is the foothold of the components, then the circuit board failure must also exist. The simple example is the dead tin part. Due to the manufacturing process, the PCB During the corrosion process, disconnection may occur. In this case, if you can't make up the wire, you can only use a thin copper wire flying wire to solve it.