Precision PCB Fabrication, High-Frequency PCB, High-Speed PCB, Standard PCB, Multilayer PCB and PCB Assembly.
The most reliable PCB & PCBA custom service factory.
Making a PCB board is not a simple process to complete the board, drill a hole to punch the components. PCB production is not difficult, the difficulty lies in the troubleshooting after production. Whether individual hobbyists or industry engineers, PCB debugging problems are quite a headache, just like programmers encounter bugs.
Some people have a strong interest in debugging PCB circuit board, just like programmers in solving bugs, common PCB circuit board problems are not a few, common problems in addition to circuit board design, damage to electronic components, circuit short circuit, quality of components, PCB circuit board disconnection fault is not a few.
Damaged diode ring color resistor
Common PCB circuit board faults are mainly concentrated on components, such as capacitance, resistance, inductance, diode, transistor, field-effect tube, etc., and the obvious damage of integrated chip and crystal oscillator, and the more intuitive way to judge the faults of these components can be observed through the eyes. There are obvious burning marks on the surface of electronic components that are obviously damaged. Such failures can be solved by simply replacing the faulty components with new ones.
Suspected damaged component? It's not the component that's broken
Of course, not all the damage of electronic components can be observed with the naked eye, such as the above-mentioned resistance, capacitance, two or three audions, in some cases, the damage can not be seen from the surface, need to use professional inspection tools for maintenance, commonly used inspection with: When a multimeter or capacitor meter detects that the voltage or current of an electronic component is not within the normal range, it indicates that there is a problem with the component or the previous component. Replace the component and check whether it is normal.
A circuit board without any damage in appearance and without detection of faults
If the component is broken, it can be detected by eye observation or instrument detection. However, sometimes when we give the component to the PCB board, we will encounter the situation that the problem can not be detected, but the circuit board can not work properly. Many beginners have no choice but to build a new board or buy one. In fact, in many cases, the components in the installation process, due to the coordination of various components, there may be unstable performance.
Circuit board circuit block division
In this case, the instrument has been unable to help, you can try to determine the possible range of the fault according to the current and voltage, as far as possible to reduce, experienced engineers may be able to quickly determine the fault area, but it is not 100% sure which specific component is broken. The only solution is to try and replace the suspect component until it 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 with screen replacement suspicious by wave detection chip, It was eventually determined to be a short circuit in a component on the side of the Southbridge chip.
Circuit board flywire
The above is actually the problem of electronic components, of course, since the PCB circuit board is the foothold of components, then the circuit board failure must also exist, the simplest example is dead tin plating part, due to the production process, in the process of PCB corrosion, there may be a broken line problem. In this case, if you can't fill the wire, you can only use fine copper wire to solve the problem.
