- FPC manufacturer will visually check the circuit board for manual welding before welding, and use a multimeter to check whether the key circuit is short circuited; In addition, do not throw the soldering iron randomly during soldering. If you throw the soldering tin onto the solder leg of the chip, it will be difficult to find it.
- If a short circuit is found, you can take a board to cut lines (especially for single/double deck boards). After cutting lines, power on each functional block separately, and eliminate part by part. You can also use a short circuit positioning analyzer for analysis.
- If there is a BGA chip, because all the solder joints are covered by the chip and cannot be seen, it is better to separate the power supply of each chip during the design and connect it with a magnetic bead or a 0 ohm resistor. In this way, when the power supply is short circuited to the ground, disconnect the magnetic bead for detection and it is easy to locate a chip. Because BGA is difficult to weld, if it is not automatically welded by the machine, it will short circuit the adjacent power supply and the two welding balls.
- Be careful when welding small surface mount capacitors, especially when there are many power filter capacitors, which may easily cause short circuit between power supply and ground. Of course, sometimes the capacitor is short circuited due to bad luck, so the best way is to check the capacitor before welding.
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