Ultra-precision PCB Fabrication, High Frequency PCB, High Speed PCB, IC Substrate, Multilayer PCB and PCB Assembly.
The most reliable PCB custom service factory.
PCB Tech

PCB Tech

PCB Tech

PCB Tech

PCB circuit board short circuit inspection and prevention
2021-09-20
View:46
Author:Frank

PCB circuit board short circuit inspection and prevention

One of the most common problems encountered in the maintenance of electronic products is short-circuits. The short-circuits cause considerable harm to the PCBA, ranging from burning components to scrapping. We can only try to avoid short circuits, we must grasp every step of the production, and do not miss every suspicious point during inspection.

1. If it is manual soldering, develop a good habit. First, check the PCB board visually before soldering, and use a multimeter to check whether the key circuits (especially the power supply and ground) are short-circuited; secondly, each time a chip is soldered Use a multimeter to check whether the power supply and the ground are short-circuited; in addition, do not throw the soldering iron randomly when soldering. If you throw the solder onto the solder feet of the chip (especially surface mount components), it will not be easy to find.
2. Open the PCB diagram on the computer, light up the short-circuited network, and see which place is closest to it. It is most likely to be connected. Pay special attention to the short circuit inside the IC.
3. A short circuit is found. Take a board to cut the line (especially suitable for single/double-layer boards), and power on each part of the functional block separately after cutting the line, and remove part of it.

4. Use a short-circuit location analyzer, such as: Singapore PROTEQ CB2000 short-circuit tracker, Hong Kong Lingzhi Technology QT50 short-circuit tracker, British POLAR ToneOhm950 multi-layer circuit short-circuit detector, etc.

pcb board

5. Be careful when soldering small-size surface-mount capacitors, especially power supply filter capacitors (103 or 104), which may easily cause a short circuit between the power supply and the ground. Of course, sometimes with bad luck, the capacitor itself is short-circuited, so the best way is to test the capacitor before welding. .

6. If there is a BGA chip, since all the solder joints are covered by the chip and cannot be seen, and it is a multi-layer board (above 4 layers), it is best to separate the power supply of each chip during the design, using magnetic beads or 0 ohms Resistor connection, so that when there is a short circuit between the power supply and the ground, the magnetic bead detection is disconnected, and it is easy to locate a certain chip. Because the welding of BGA is very difficult, if it is not automatically welded by the machine, a little carelessness will short-circuit the adjacent power supply and the ground two solder balls.
Our factory is located in China. For decades, Shenzhen has been known as the world's electronics R&D and manufacturing center. Our factory and website are approved by the Chinese government, so you can skip the middleman and buy products on our website with confidence. Because we are a direct factory, this is the reason why 100% of our old customers continue to purchase on iPCB.
No minimum requirements
You can order as little as 1 PCB from us. We will not force you to buy things you really don't need to save money.
Free DFM
Before you pay in the most timely manner, all your orders will receive free engineering document review services by our well-trained professional and technical personnel.
On-time delivery
Over the years, we are proud to maintain a 99% on-time delivery rate. We work in three shifts to ensure that your PCB can appear on your desk as planned and as early as possible. You can choose DHL and other courier services to balance speed and budget. We only use services from reliable and reputable companies.