How To Confirm And Analyze PCBA Power Supply Short Circuit

When dealing with PCBA, the most difficult to predict and solve is the power supply short circuit problem. Especially when the board is more complicated and various circuit modules increase, it is difficult to control the power supply short circuit of PCBA. Today, the editor collects a PCBA power supply short circuit analysis method for you! Let's take a look!

PCBA power supply short circuit

Introduction to Analysis:

Generally, if the board is not short-circuited with tin, for example, the chip is broken or the capacitor is broken. Generally, the resistance to GND is not 0Ω, and there will be more or less several ohms or fractions of ohms. This feature can be used to quickly locate.

Use a DC stabilized power supply, adjust the power supply voltage to the voltage of the short-circuit power supply (3.3V short-circuit, adjust it to 3.3V), set it to current limiting mode, and set the limiting current to 500mA first, depending on the actual situation.

Disconnect the power supply of the PCBA board, connect to the set power supply, and see where the circuit board is hot, and where it is hot, it is usually short-circuited.

You can use an infrared camera to check where it is hot. If you don't have an infrared camera, you can touch it with your hands and feel it (be careful not to get burned).

Precautions:

The current limit setting of the DC source needs to be determined according to the actual situation. If the current limit setting is too small, the heating will not be obvious, and no problem can be found. If the setting is too large, the copper wires on the PCB may be burned, and the current can be reduced from small to large. Tune slowly, knowing where to find the problem.

If you encounter a situation where the PCBA power supply cannot be used due to a short circuit, you can try the analysis method mentioned by the editor, and it may be very effective!