One of the most common problems encountered in the maintenance of electronic products is short-circuit. The short-circuit causes considerable harm to PCBA, ranging from burning components to scrapping. We can only try to avoid short circuits, we must grasp every step of the production, and do not miss every suspicious point during inspection.
1. If it is manual soldering, develop a good habit. First, check the PCB board visually before soldering, and use a multimeter to check whether the key circuits (especially the power supply and the ground) are short-circuited; secondly, each time a chip is soldered Use a multimeter to check whether the power supply and ground are short-circuited; in addition, do not throw the soldering iron randomly when soldering. If you throw the solder onto the solder feet of the chip (especially surface mount components), it is not easy to find.
2. 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.
3. A short circuit is found. Take a board to cut the line (especially suitable for single/double-layer board cut lines after each part of the functional block is energized separately, and part of it is excluded.
4. Use short-circuit location analysis.
