What are the methods to check and avoid short circuit of PCB circuit board?

by:A-TECH      2021-03-22
Short circuit causes considerable harm to PCBA, ranging from burning components to large PCBA scrap; at the same time, short circuit is also the most common failure of PCB circuit boards. So, what are the methods to check and avoid the short circuit of the PCB circuit board? 1. Check the PCB board before manual soldering, and use a multimeter to check whether the key circuit is short-circuited; then, after each chip is soldered, use the multimeter to check whether the power supply and the ground are short-circuited. 2. When soldering, be careful with small-size surface mount capacitors, especially power supply filter capacitors, which can easily cause a short circuit between the power supply and the ground. 3. If there is a BGA chip, it is best to separate the power supply of each chip during the design and connect it with magnetic beads or 0 ohm resistors. It is worth noting that because the welding of BGA is difficult, if it is not automatic welding, it is easy to short-circuit the two solder balls between the adjacent power supply and the ground. 4. Open the PCB diagram on the computer, light up the short-circuited network, and check which places are closest to each other and are most easily connected. 5. Once it is found that there is a short circuit, you can take a board to cut the line, and then power on each part of the functional block, and slowly troubleshoot. This method is suitable for single/double-layer boards. 6. It is also an effective method to use a short-circuit locating analyzer for detection. The above is the method to check and avoid the short circuit of the PCB circuit board, I believe it will help you. In short, to avoid short circuits, we must tightly grasp every step and link in PCB production, do not miss every suspicious point when checking, and slowly troubleshoot, so as to effectively prevent the occurrence of short circuits.
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