What Should I Do If The PCB Has A Short Circuit? Don't Worry! Check Out This Article!

Many engineers don't want to see the short circuit of PCBA. What should I do if there is a short circuit in the PCB? Today, follow us to see why there is a short circuit. If there is a short circuit, how do we troubleshoot it?

PCB circuit board

There are usually two short-circuit conditions. One is that the PCB circuit board has reached a certain service life. The second situation is that the inspection work in the production of PCB circuit boards is not in place. However, these small errors in production have caused great harm to the entire PCB circuit board, which may lead to scrap. So how do we check and prevent short circuits on the circuit board?

First:

      Open the PCB diagram on the computer, light up the short-circuited network, and see which place is closest to it. It is most likely to be connected. Pay special attention to the short circuit inside the IC.

second:

      Use short-circuit location analyzers, such as: Singapore PROTEQ CB2000 short-circuit tracker, Hong Kong Lingzhi Technology QT50 short-circuit tracker, British POLAR ToneOhm950 multi-layer circuit short-circuit detector, etc.

third:

      Be careful when soldering small surface mount capacitors, especially power filter capacitors (103 or 104), which are large in number and easily cause a short circuit between the power supply and the ground. Of course, sometimes with bad luck, the capacitor itself will short-circuit, so the best way is to test the capacitor before soldering.

fourth

      If it is manual welding, develop a good habit. Firstly, visually check the PCB board before soldering, and use a multimeter to check whether the key circuits (especially power and ground) are short-circuited; secondly, after each chip is soldered, use a multimeter to measure whether the power and ground are short-circuited; in addition, do not throw the soldering iron at will during soldering . If solder is thrown on the solder feet of the chip (especially surface mount components), it is difficult to find it.

fifth:

      If there is a BGA chip, since all the solder joints are covered by the chip and cannot be seen, and it is a multi-layer board (above 4 layers), it is best to separate the power supply of each chip during the design and connect it with magnetic beads or 0 ohm resistors. In this way, when there is a short circuit between the power supply and the ground, it is easy to locate a certain chip by disconnecting the magnetic bead detection. Because the welding of BGA is very difficult, if it is not automatically welded by the machine, a little carelessness will short-circuit the adjacent power supply and the ground two solder balls.

sixth:

      If a short circuit is found, then take a board and cut the circuit (especially suitable for single-layer/double-layer boards). After cutting, energize each part of the function block and eliminate it part by part.

The above is the method we can do when there is a short circuit! Hope to help you!