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PCB board short circuit six inspection methods

First, opening the PCB  board design on the computer, lighting the short-circuited network, and seeing where the nearest place is, the easiest to connect. Pay particular attention to short circuits inside the IC.

pcb board inspection

Second, if it is manual welding, it is necessary to develop good habits:

1. Visually inspect the PCB board before soldering, and using a multimeter to check whether the critical circuit (especially the power supply and ground) is short-circuited;

2. Using a multimeter to measure whether the power supply and ground are short-circuited each time a chip is soldered.

3.Do not smash the soldering iron when soldering, if the solder is rubbed onto the soldering feet of the chip                    (especially surface mount components), it is not easy to find.

3. Short circuit was found. Takinga pcb board to cut the line (especially suitable for single/double board), after each line is cut, each part of the function block is energized separately and gradually eliminated.

4. The using of short-circuit positioning analysis instrument

5. If there is a BGA chip, since all the solder joints are invisible by the chip cover, and it is a multi-layer board (more than 4 layers), it is better to separate the power of each chip when designing, connected withmagnetic beads or 0 ohms. So that if the power supply is shorted to the ground, the magnetic bead is detected and it is easy to locate a certain chip. Because the BGA is difficult to solder, if it is not the machine’s automatic soldering, the adjacent power supply and ground solder balls will be short-circuited with a little care

6. Small size surface mount capacitors must be careful when soldering, especially the power supply filter capacitor (103 or 104), the number is large, it is easy to cause the power supply and ground short circuit. Of course, sometimes the luck is not good, the capacitor itself is short-circuited, so the best way is to check the capacitance before soldering.