1. Switch pcba manufacturers measure voltage to find faulty PCB boards

Switch pcba manufacturers first need to confirm whether the voltage of the power pins of each chip is normal, and then check whether the various reference voltages are normal, and whether the working voltage of each point is normal, etc.

2. Signal injection method to find faulty PCB boards

The Switch pcba manufacturer adds the signal source to the input terminal, and then measures the waveforms of each point in turn to see if it is normal, so as to find the fault point. Sometimes we also use a simpler method, such as holding a tweezers in hand, touching the input terminals of each level to see if there is any response at the output terminal, which is often used in audio, video and other amplification circuits (but be careful, the hot bottom plate This method cannot be used for circuits with high voltage or high voltage, otherwise it may cause electric shock).

3. Switch pcba manufacturers other methods to find faulty PCB boards

The Switch pcba manufacturer found that there are many other ways to find the fault point, such as looking, listening, smelling, touching and so on.

"Look" is to see whether there are obvious mechanical damages to the components, such as rupture, burnt black, deformation, etc.; Abnormal, etc.; "smell" is to check whether there is any peculiar smell, such as the smell of burning, the smell of capacitor electrolyte, etc. For an experienced electronic maintenance personnel, he is very sensitive to these smells; "touch" is to use Use your hands to test whether the temperature of the device is normal, for example, it is too hot or too cold.