Industrial control circuit board damage generally refers to a component damage, which may be a chip, a capacitor, or even a small resistor. The repair process is to identify the damaged component and replace it. This may seem simple, but in reality, it requires profound knowledge, rich experience, and necessary expensive testing equipment, especially to quickly find faulty components. In addition to rich experience, repair engineers are increasingly required to have quick thinking skills in analysis and judgment. Below, we will introduce several detection methods for circuit boards:

Signal injection method:

This method uses different output signals from external signal sources as known test signals, and uses the terminal indicator of the tested electronic device to indicate the test results. When viewing, according to specific requirements, select the corresponding signal source to obtain known signals for different targets, and view them from the later stage to the later stage, Inject a known signal from the input end of the terminal indicator of the tested device, and then sequentially move from the subsequent circuit to the previous circuit. In the repair of industrial circuit boards, known and different test signals are separately injected into the input terminals of various levels of circuits, and the response of the end face indicator of the tested equipment is investigated to determine the existence of the problem and analyze the cause of the problem