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The method of detecting PCB board faults quickly
- May 16, 2017 -

PCB Production Board is not a simple process to finish the board, drilling a hole to play the components will be good. PCB production is not difficult, difficult to do after the completion of the troubleshooting. Whether it is personal enthusiasts or industry engineers, PCB circuit board in debugging when encountered problems is also a considerable headache, like programmers encounter bugs.

Some people to debug PCB circuit board has a keen interest, like the programmer in the solution of bugs, common PCB board problems and many, common problems in addition to circuit board design, electronic components damage, circuit short-circuit, the quality of components, PCB circuit board broken down a few.

Common PCB circuit board failures are mainly concentrated on the components, such as capacitors, resistors, inductors, diodes, transistors, FET, and so on, the integrated chip with the crystal oscillator damage, and the judgement of these components of a more intuitive way of failure can be observed through the eyes. There are obvious damage to the surface of the electronic components of the burning traces. Like this kind of malfunction, the problem element can be solved directly by replacing the new.

Of course, not all electronic components can be damaged with the naked eye to observe, such as the above mentioned resistors, capacitors, transistors, and so on, in some cases damage is not apparent from the surface, need to use professional inspection tools for maintenance, commonly used inspection appliances are: multimeter, capacitance meter, in the detection of a certain electronic components voltage or current is not in the normal range, indicating that the components or the previous components have problems, direct replacement and check to see if normal.

Components broken down, whether by eye observation or instrumentation, can be detected, but sometimes we give the PCB board components, will encounter detection does not problem, but the circuit board does not work properly. Many novices encounter this problem, can only redo a board, or buy a piece. In fact, encountered this situation, many times are components in the installation process, due to the coordination of the various components of the problem, there is a possibility of instability performance.

In this case, the instrument has not been able to help, can try to determine the possible range of faults according to current voltage, minimize, experienced engineers may be able to quickly judge the fault area, but the specific components of which bad and not 100% to determine. The only way to try to replace the suspect component is until you find the problem component. Last year, my notebook motherboard water intake, in the maintenance of the teacher also encountered the failure to detect, and in the repair process replaced three components, separately is the power supply chips, diodes, USB charging components (is the notebook blue jack that, shut down the state can be charged to the device), and finally through a wave of detection and replacement of suspicious chips, before the final determination for the side of the South Bridge chip a component short-circuit.

The above mentioned in fact is the problem of electronic components, of course, since PCB circuit board as the end point of the components, the circuit board fault is definitely also exist, the simplest example of the Die tin plating site, because of the production process, in the process of PCB corrosion, there may be a disconnection problem. Encountered this situation, if the line can not be filled, then can only use fine wire to solve.

PCB circuit board failure in the case of no apparent damage, check up really very troublesome, and in the process of troubleshooting, there will be a focus on the spirit, to find out the problem will have a sense of accomplishment, the programmer solves the bug is this mood, I often like to troubleshoot some difficult to repair the board, I think it is a pleasure.