Method for Detecting PCB Failures

Making a PCB board is not a simple process to complete the board, just drill a hole and put the components on it. PCB production is not difficult, the problem it is the troubleshooting after the completion of the production. Whether it is an individual fan or an industry engineer, when the PCB board is being debugged the problem is also quite a headache, just like a programmer encounters a BUG.

 

Method for Detecting PCB Failures

 

Some people have a strong interest in debugging PCB boards, just like programmers are solving BUGs, common PCB boards.There are many problems, common problems except board design, damage to electronic components, short circuit, quality of components, PCB circuit board disconnection failures are not rare.

 

Method for Detecting PCB Failures

 

Common PCB board failures are mainly concentrated on components such as capacitors, resistors, inductors, diodes, transistors,field effect transistors, etc. , the integrated chip and the crystal oscillator are obviously damaged, and the method for judging the fault of these components is relatively intuitive.Look at the eyes. The surface of electronic components with obvious damage has obvious burning marks. Like this type of failure, directly put the problem element the replacement of the new one can be solved.

 

Method for Detecting PCB Failures

 

Of course, not all electronic components can be damaged by the naked eye, such as the resistors, capacitors, and diodes mentioned above. In some cases, the damage cannot be seen from the surface, and it needs to be repaired with professional inspection tools. It has: multimeter, capacitance meter, etc., when it is detected that the voltage or current of an electronic component is not within the normal range, the element is stated There is a problem with the device or the previous component. Replace it directly and check to see if it is normal.

 

Method for Detecting PCB Failures

 

If the components are broken, whether it is observed by eyes or by instrument, it can be detected, but sometimes we are giving When the components on the PCB are on the board, you will encounter problems that cannot be detected, but the board will not work properly. Many newbies  If you run into this kind of problem, you can't do it anymore. You can only make a board again, or buy a piece. In fact, in this case, many times it is yuan  During the installation process, the performance may be unstable due to the coordination of various components.

 

In this case, the instrument can no longer help, you can try to judge the possible range of the fault according to the current and voltage, try to narrow down, experienced engineers may be able to quickly determine the fault area, but the specific components are broken. But not 100% certain. The only way is to try to replace the suspect component until the problem component is found. Last year, my notebook motherboard was flooded. When I was repairing the master, I also encountered the failure to detect the fault. I replaced the components three times during the repair process. They are the power supply chip, diode, and USB charging component. The socket is used to charge the device when it is turned off. Finally, it is determined by a wave detection and replacement of the suspect chip, and finally it is determined that a component on the side of the south bridge chip is short-circuited.

 

The above mentioned 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 process, There is a possibility of wire breakage during PCB corrosion. In this case, if you can't make up the line, you can only solve it with a thin copper wire.

 

PCB board failure is not very cumbersome to check, it is very troublesome to check, and during the troubleshooting process, there will be a focus on the spirit, to find out the problem will have an inexplicable sense of accomplishment, programmers solve the BUG is this kind of mood, I am often like to check some hard-to-maintain boards, which I think is a pleasure.

 

Method for Detecting PCB Failures