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PCB board production involves a series of complex and precise manufacturing processes. As the circuit boards become more integrated and more complex, the manufacturing process becomes more and more challenging for production personnel, and the probability of defects and failures also increases. Big.
Regardless of the reason, for personal use or commercial applications, PCB defects can cause serious adverse consequences. For example, circuit board failures in important medical equipment may be life-threatening, while problems with smartphones or automotive electronics can interfere with user activities .
Since a short circuit will cause the local temperature of the circuit board to rise, supplying power to the circuit and finding areas with heat can help narrow the inspector to find the short circuit problem more easily. If you can't feel the subtle hot spots with your fingers, you can use a thermal imager to identify the locally heated areas. However, by using a voltage that will not damage the component or the copper trace is overheated until it is turned on, be sure to use a power supply that short-circuits the copper trace. In addition, please be careful to avoid burns or electric shocks.
repair short/open lines
After the short circuit or open circuit point is identified on the PCB, the next step is to isolate the problem. Although it is easy to do this on the outer surface of the circuit board, it is a challenge for the inner layer. Possible solutions include drilling through holes or cutting appropriate external copper traces.
If there are solder bridges or short circuits between two solder joints, please pass the tip of the hot soldering iron between the two pins or wires to remove these solder joints or short circuits. In addition, use tin wire or a sniffer to remove excess solder.
Repairing the open circuit depends on the nature of the fault and the size of the copper trace. On wider copper traces, you can scrape off both sides of the open circuit, and then solder a jumper wire between the two. However, this may not be suitable for narrow traces or circuit boards with strict environmental requirements. The best way is to route between the corresponding pads. When finished, use some glue to fix the wires in place.
By cleaning and carefully re-soldering the connector, it is easy to repair the open circuit on the component pin. On the other hand, short circuits or open circuits caused by component failures require replacement of faulty or aging components.
PCB boards often have problems after use due to design or production defects. In most cases, the board will be at a low performance level or not work at all. When a problem occurs, identifying and fixing the fault is essential to ensure the continued use of the equipment. The success of the repair depends on the ability to identify the fault and its location.
Most PCB manufacturers have all test equipment and tools to identify and correct circuit board failures. However, for some designers or professionals with limited resources, it is impossible to purchase all these tools. Fortunately, electronics professionals can use low-cost technology to identify and fix a considerable number of problems with basic tools and patience.
