First, the computer to open

Short-circuit network lit to see where the nearest and easiest to connect to a piece. Special attention to IC internal short circuit.

Second, if the manual welding, to develop good habits.

1, visual inspection of the PCB before welding, and use a multimeter to check the key circuits (especially the power supply and ground) is short-circuited.

2, each time after welding a chip, use a multimeter to test the power supply and ground is short-circuited;

3. Do not flick the soldering iron when soldering. If you flick the solder to the soldering feet of the chip (especially the watch mounting components),how to test pcb board with a multimeter it will not be easy to find.

Third, a short circuit is found. Take a board and cut the wires (especially good for single/double layer boards). After cutting the wires, power up each functional block separately and eliminate them gradually.

Fourth, the use of short-circuit location analyzer

Fifth, if there is a BGA chip, due to all the solder joints are covered by the chip, not visible, and is a multi-layer board (more than 4 layers), so it is best to separate the power supply of each chip in the design, with a magnetic bead or 0 ohm resistor connection, so that when the power supply is short-circuited with the ground, the magnetic bead detects the disconnection, easy to locate the chip. Because of the difficulty of BGA welding, if it is not a machine automatically welded, an inadvertent short-circuit will cause the power supply and ground two neighboring solder balls.

Six, the small size of the table sticker capacitors for welding must be careful,pcblink 1oz vs 2oz Copper especially for the power supply through the filter capacitors (103 or 104), the number of more, it is easy to develop and cause the work of the power supply and ground short circuit. Of course, sometimes bad luck, will encounter a capacitor technology itself is short-circuited, so our best approach is to weld before the capacitor can be tested once.