Six inspection methods of PCB circuit board:
A computer on the PCB design, the short circuit of the network to light, to see where the most recent, the most easy to connect to a piece of. Particular attention should be paid to the short circuit inside the IC.
Two, if it is artificial welding, to develop good habits:
1, before the welding to visual inspection of the PCB board, and use a universal meter to check the key circuits (especially power supply and ground) is short circuit;
2, each time a chip is used to measure the power supply and the ground is short circuit;
3, welding not disorderly jilt iron. If the solder thrown on a chip welding foot (especially surface mount component), is not easy to find.

Three, found that there is a short circuit phenomenon. Take a piece of board to secant (especially for single / double plate), after each part of secant function blocks are energized, and gradually eliminate.
Four, the use of short circuit positioning analysis instrument.
Five, if there is a chip BGA, since all solder joints is chip covered invisible and multilayer (more than 4 layers), so it is best in the design of each chip of the power split open, connected by magnetic beads or 0 ohm resistor, so there power earthing and short circuit, disconnect the magnetic inspection test, easily navigate to a chip. As BGA welding is difficult, if not the machine automatic welding, a little attention will be adjacent to the power supply and the two short circuit.
Six, the small size of the surface mount capacitors must be careful, especially the power filter capacitor (103 or 104), a large number, it is easy to cause power supply and short circuit. Of course, sometimes bad luck, will encounter the capacitor itself is a short circuit, so the best way is to detect the capacitance before welding.