Once the PCB design is completed, we need to check it for all the project features. Just like when we finish the test paper by ourselves, we should do a simple analysis and check all its problems again, so as to ensure that we won’t make a big mistake due to negligence. The following neoden mounter manufacturers to explain how to troubleshoot PCBA processing short circuit faults related knowledge.
1. Open the PCB design on the computer, the short-circuit network is lit, see what place is the closest, the most likely to connect to a piece. Pay special attention to the IC internal short circuit. If manual soldering, to develop good habits:.
2. Before soldering to manually visually inspect the PCB board once, and use a multimeter to check the key circuits ( especially the power supply and ground ) whether short-circuit.
3. Every time after welding a chip to use a multimeter to measure the power supply and ground whether there is a short circuit.
4. PCBA production soldering time do not fling iron, accidentally fling the solder to the chip’s soldering feet (especially the table sticker components), it is not easy to find a short-circuit phenomenon. Take a board to cut the line (especially suitable for single/double layer board), cut the line after each part of the functional blocks were energized, and gradually eliminated.
5. The use of short-circuit location analysis instruments.
6. PCBA chip processing BGA chip, due to all the solder joints are covered by the chip invisible, and multi-layer board (more than 4 layers), then it is best to split the power supply in the design of each chip, with a magnetic bead or 0 ohm electric sun connection, so that there is a power supply with a short circuit to the ground, disconnecting the magnetic bead detection, it is very easy to determine the generation to a chip. Due to the difficulty of BGA soldering, manual welding, if not careful will be adjacent to the power supply and ground two solder balls short-circuited.
7. Small-sized table sticker capacitor welding must be careful, especially the power supply filter capacitor ( 103 or 104 ), a large number, it is easy to cause the power supply and ground short.
Quick facts about NeoDen
① Established in 2010, 200+ employees, 8000+ Sq.m. factory.
② NeoDen products: Smart series PNP machine, NeoDen K1830, NeoDen4, NeoDen3V, NeoDen7, NeoDen6, TM220A, TM240A, TM245P, reflow oven IN6, IN12, Solder paste printer FP2636, PM3040.
③ Successful 10000+ customers across the globe.
④ 30+ Global Agents covered in Asia, Europe, America, Oceania and Africa.
⑤ R&D Center: 3 R&D departments with 25+ professional R&D engineers.
⑥ Listed with CE and got 50+ patents.
⑦ 30+ quality control and technical support engineers, 15+ senior international sales, timely customer responding within 8 hours, professional solutions providing within 24 hours.
Post time: Jul-27-2023