How to troubleshoot the short circuit fault of PCBA processing
2024-01-22
Once the PCB design is complete, we need to check all of its project features. Just like we do the exam paper ourselves, we should do a simple analysis and check all the questions again to make sure that we don't make big mistakes due to negligence. The following PCBA processing manufacturers will explain how to eliminate the relevant knowledge of PCBA processing short circuit faults.
1. Open the PCB design on the computer, light up the short-circuited network, and see where it is closest and easiest to connect together. Pay special attention to short circuits inside the IC. If it's manual welding, develop good habits:
2. Before soldering, the PCB board should be manually visually inspected, and the key circuit (especially the power supply and ground) should be checked with a multimeter to see if it is short-circuited.
3. Every time a chip is soldered, use a multimeter to test whether there is a short circuit between the power supply and the ground.
4. When PCBA production soldering, do not throw the soldering iron indiscriminately, and accidentally throw the solder on the solder feet of the chip (especially the surface mount components), it is not easy to find and find that there is a short circuit. Take a piece of board to cut the line (especially suitable for single/double layer boards), and after cutting the line, each part of the function block will be energized separately and gradually eliminated.
5. Use a short-circuit location analytical instrument.
6. There are BGA chips in PCBA chip processing, because all the solder joints are covered by the chip and cannot be seen, and it is a multi-layer board (more than 4 layers), then it is best to divide the power supply of each chip when designing, and connect it with magnetic beads or 0 ohm electric yang, so that when the power supply is short-circuited to the ground, the magnetic beads are disconnected for detection, and it is easy to identify a certain chip. Due to the difficulty of BGA welding, if you do manual welding, you will short-circuit the adjacent power supply and the ground two solder balls if you are not careful.
7. Be careful when soldering small size surface mount capacitors, especially power filter capacitors (103 or 104), which are large in number, and it is easy to cause the power supply to be short with the ground.
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