How to check and prevent a short on PCB circuit board?

PCB circuit board short-circuit is the most common problem, there are generally two cases of short-circuit, one is PCB circuit board has reached a certain service life. The second case is the PCB circuit board production inspection is not in place. However, these small mistakes in production, the whole PCB circuit board is a great harm, it is likely to cause scrap.

三德盈 Electronic here would like to show you how to check and prevent a short on PCB circuit board:

First, if you found a short-circuit phenomenon, the first step is cut the line. And this way is especially suitable for the single side board and double layer pcb board.

Second, You must be carefully if the capacitor is small size, especially the power filter capacitor, because it is easy to cause power and ground short circuit. But you have to make sure the capacitor itself is short circuited. So it is important to check the capacitor before welding.

Third, if it is artificial welding, using a multimeter to check the key circuit (especially for power and ground) is short circuited; use multimeter check whether each welding power supply and short-circuit a chip welding.

Fourth, open the PCB diagram on the computer, lit short circuit network to see where is the nearest, the most easily connected to a piece. Particular attention should be paid to the internal short-circuit of the IC.

Fifth, using short circuit positioning analyzer, such as: CB2000 short-circuit tracking device, QT50 short tracking device, ToneOhm950 multilayer circuit, short-circuit detector.

PCB circuit board inspection work can not be ignored, every inspection step must be treated carefully. The production process can not miss any suspicious, Only in this way can reduce the rework rate and scrap rate, and can avoid unnecessary loss.