How to detect PCB fault quickly

878 Published by FASTPCBA 11月 01,2018

How to detect PCB fault quickly

Making PCB board is not as simple as finishing the board according to the process.PCB production is not difficult, the difficulty lies in the production after the troubleshooting.Whether you are a fan or an industry engineer, it is also quite a headache for PCB circuit boards to encounter problems when debugging, just as it is for programmers to encounter bugs.

Some people have a strong interest in debugging PCB boards. Just like programmers are solving bugs, there are many common PCB board problems. Common problems include circuit board design, damage of electronic components, circuit short circuit, quality of components and fault of PCB boards.

PCB fault

PCB fault

All of the above are actually problems of electronic components. Of course, since PCB circuit board is the foothold of the components, the fault of circuit board must also exist. The simplest example is dead tin plating part.In this case, if the wire can not be patched, then the wire can only be used to solve the problem.

PCB circuit board fault in the case of not obvious damage, it was very trouble to check, and in the process of screening, there will be a dedicated spirit, to find out the problem after can have a strange sense of achievement, programmers solve BUG, that is, this kind of mood, I often like to troubleshoot some boards are hard to maintain, I think it is a pleasure.

Common PCB circuit fault mainly focuses on the components, such as capacitors, resistors, inductors, diodes, transistors, field effect tubes, etc., and the obvious damage of integrated chips and crystal oscillations can be detected by eye observation.The surface of electronic components with obvious damage has obvious burn marks.Such failures can be solved by replacing the problem element directly.

Of course, not all the damage of the electronic components were observed with the naked eye, such as what is said above resistor, capacitor, diodes, etc., in some cases, the damage was unable to see that come from the surface, need with the help of a professional inspection tool for repair, check with commonly used: multimeter, capacitance meter, etc., in the test to a electronic voltage or current is not in the normal range, that the components or the components before problem, change directly to check to see if normal again.

If the component is broken, it can be detected with both eye observation and instrument detection. However, sometimes when we send components to the PCB board, there will be no problem of detection, but the circuit board cannot work properly.Many novices have no choice but to make a new board or buy one.Actually encounter this kind of situation, a lot of time is the component is in installation process, because of the problem that each component works together, the performance is likely to appear not steady.

In such a situation, the instrument is no longer able to help, so we can try to judge the possible range of fault based on the 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 is not 100% certain.The only way to do this is to try to replace the suspect until the problem is found.Last year, and my laptop motherboard, the water in the master maintenance time had to detect the fault, and change the three elements in the process of maintenance, power supply chip, diode, USB charging device (laptop blue socket that, shutdown condition can recharge equipment), the last is by replacement of suspicious chip wave detection and screening finally determine the for the occurrence of an element on the edge of short circuit chip.(PCB fault)

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