A method for quickly detecting PCB board faults
Release time:
Apr 27,2023
Making an FC8 board is not simply a matter of following the process to complete the board. Just drill a hole and add a component. The production of PC8 board is not difficult, but the difficulty lies in troubleshooting after completion. Whether it's a personal enthusiast or an industry engineer, encountering problems while debugging PCB circuit boards is also quite a headache, just like programmers encountering bugs.
Making an FC8 board is not simply a matter of following the process to complete the board. Just drill a hole and add a component. The production of PC8 board is not difficult, but the difficulty lies in troubleshooting after completion. Whether it's a personal enthusiast or an industry engineer, encountering problems while debugging PCB circuit boards is also quite a headache, just like programmers encountering bugs.
Some people have a strong interest in debugging PCB circuit boards, just like programmers solving bugs. There are many common PCB circuit board problems, including circuit board design, damage to electronic components, circuit shorts, component quality, and PCB circuit board wire breakage.
The common PCB circuit board faults mainly focus on components, such as capacitors, resistors, inductors, diodes, transistors, field-effect transistors, etc. The obvious damage to integrated chips and crystal oscillators can be observed through the eyes, and the more intuitive method to determine these component faults can be observed through the eyes. There are obvious burning marks on the surface of electronic components with obvious damage. For faults like this, simply replacing the faulty component with a new one can solve the problem.
Of course, not all electronic component damage can be observed with the naked eye, such as resistors, capacitors, transistors, etc. In some cases, the damage cannot be seen from the surface and requires professional inspection For maintenance, commonly used inspection tools include a multimeter, capacitance meter, etc. When a certain electronic component's voltage or current is detected to be outside the normal range, it indicates that there is a problem with the component or the previous component. Replace it directly and check again to see if it is normal.
If a component is broken, it can be detected by both eye observation and instrument detection. However, sometimes when we attach a component to a PCB board, we may encounter situations where the detection fails but the circuit board cannot function properly. Many beginners encounter this problem and have no choice but to make a new board or buy one. In fact, when encountering this situation, many times it is due to the coordination of various components during the installation process, which may lead to unstable performance.
In this situation, the instrument is no longer helpful. You can try to determine the possible range of the fault based on current and voltage, and try to narrow it down as much as possible. Experienced engineers may be able to quickly determine the fault area, but the specific component that broke cannot be 100% determined. The only way is to try replacing the suspect component until the faulty component is found. Last year, my laptop motherboard was flooded with water, and I also encountered a problem when repairing it for my master. During the repair process, I replaced three components, namely the power supply chip, diode, and USB charging component (which is the blue socket of the laptop that can charge the device when it is turned off). Finally, I replaced the suspicious chip through one wave detection and troubleshooting, It was finally determined that a component near the South Bridge chip was short-circuited.
The above is actually a problem with electronic components. Of course, since PCB circuit boards are the foothold of components, circuit board faults must also exist. The simplest example is the dead tin plating area. Due to manufacturing process reasons, there may be wire breakage during PCB corrosion. In this situation, if it is not possible to repair the wire, the only solution is to use fine copper wire flying wire.
PCB circuit board faults can be very troublesome to troubleshoot without obvious damage, and during the troubleshooting process, there is a sense of focus. Once the problem is identified, there is an inexplicable sense of achievement. Programmers solve bugs in this way. I often like to troubleshoot some difficult to repair boards, and I think it is a pleasure.
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