How to check for short circuits on a PCB circuit board? PCB circuit board manufacturers teach you six simple troubleshooting methods.

Firstly, computers can easily connect to PCBs, opening up PCB designs, illuminating short-circuit networks, and observing closer areas. Special design should pay attention to internal short circuits in the IC.

If it is manual welding, please develop good habits:

Before welding, visually inspect the PCB board and use a multimeter to check for short circuits in key circuits (especially power and ground);

Welding of finished products for measuring power and ground short circuits using a multimeter to various chips;

Do not throw soldering iron randomly during welding. If solder is thrown onto the solder feet of the chip (especially for surface mounted components), it will be difficult to find it.

Analyze the main instruments using a short circuit positioning system

If there is a BGA processing chip, as all tin points are covered by the processing chip and cannot be seen, and are multi-layer circuit boards (four or more layers), the power modules of each processing chip are separate in the design scheme. Through the connection of magnetic beads or 0 ohm resistors, when the power module is short circuited to ground, the magnetic bead detection is disconnected, making it easy to find a certain processing chip. Because it is difficult to weld large BGA welding, without an automatic welding machine, if you are not careful, it will cause two adjacent power modules and grounding solder balls to short-circuit.

Small size surface mount capacitors must be particularly careful when completing welding, especially for AC power supplies flowing through filter capacitors (103 or 104), which can easily generate and cause short circuit faults between the AC working power supply and the ground. Of course, sometimes with bad luck, you may encounter a capacitor that is technically short circuited. Therefore, our appropriate method is to complete the inspection of the capacitor before welding.