1. If manual welding, to develop good habits, first of all, to visually check pcbsmart.com/' target='_blank'>PCB plate welding, and using a multimeter to check the key circuit (especially the power and ground) is short; secondly, it using a multimeter to check whether the power supply and ground short circuit welding every time a chip; in addition don't throw, welding iron, if the solder flung to the leg of the chip (especially surface mount components), it is not easy to find.
2. In the computer to open the PCB diagram, light circuit network, see what place away from the nearest, most likely to be attached to a piece of. Special attention should be paid to the IC internal short circuit.
3. Were found to have short circuit phenomenon. Take a piece of plate to the secant (particularly suitable for single / double plate), secant will each part function blocks are energized, a portion of exclusion.
4. 使用短路定位分析仪，如：新加坡PROTEQ CB2000短路追踪仪，香港灵智科技QT50短路追踪仪，英国POLAR ToneOhm950多层板路短路探测仪等。
4. Using the short position analyzer, such as: Singapore PROTEQ CB2000 short trackers, euro RSCG Hongkong technology for short circuit to QT50 tracker, the British POLAR ToneOhm950 multilayer board short circuit detector etc..
5. If the BGA chip, the chip is covered all solder joints is invisible, but it is multilayer (more than 4), so it is best to design the power per chip split open, connected with magnetic beads or 0 ohm resistor, so that power and short circuit, open magnetic detection, easy positioning to a chip. Because the BGA welding is difficult, if not the machine automatic welding, little attention will turn two solder ball short adjacent power and ground.
6. Small size surface mount capacitor welding must be careful, especially the power supply filter capacitor (103 or 104), the number of many, very easy to cause the power supply and ground short circuit. Of course, sometimes bad luck, will meet the capacitor itself is short, so the best way is the capacitance detection again first before welding.
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