1. If it is manual welding, it is necessary to develop a good habit. First, visually inspect the Small home pcba board before welding, and use a multimeter to check whether the key circuit is short-circuited; secondly, use a multimeter to test the power supply after each soldering of a chip. Whether it is short-circuited with the ground; in addition, the Small home pcba factory recommends not to throw the soldering iron randomly when soldering. If the solder is thrown on the solder pins of the chip, it is not easy to find.

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

　　3. It is found that the Small home pcba has a short circuit. Take a board to cut the line, after cutting the line, energize each part of the functional block separately, and remove some of them.

　　4. If there is a BGA chip, since all the solder joints are covered by the chip and invisible, and it is a multi-layer board, it is best to separate the power supply of each chip during design, and connect it with magnetic beads or 0 ohm resistors, so that the When the power supply and the ground are short-circuited, the magnetic bead detection is disconnected, and it is easy to locate a certain chip.

　　5. Be careful when welding small-sized surface mount capacitors of Small home pcba, especially the power filter capacitors, which can easily cause a short circuit between the power supply and the ground.