For a newly designed 5G circuit board, debugging is often difficult, especially when the board is relatively large and there are many components, it is often impossible to start; if you master a reasonable set of troubleshooting methods, debugging will be more effective. So, what are the methods for finding faults in newly designed 5G circuit boards?
1. Measuring voltage method
First of all, it is necessary to confirm whether the voltage of the power supply pins of each chip is normal, and then check whether the various reference voltages are normal, including whether the working voltage of each point is normal.
2. Signal injection method
Add the signal source to the input terminal, and measure the waveform of each point in turn to see if it is normal, so as to find the fault point. Sometimes simpler methods can be used, such as holding a tweezers to touch the input terminals of all levels to see if the output terminals respond. This is often used in audio, video and other amplifier circuits; Or circuits with high voltage, this method cannot be used, otherwise electric shock may occur. If there is no response at the previous level, but there is a response at the next level, it means that the problem lies in the previous level and should be checked.
3. Look, hear, smell, touch
"Looking" is to see whether the components have obvious mechanical damage, such as cracking, blackening, deformation, etc. "Listening" is to listen to whether the working sound is normal, such as something that should not be ringing, the place that should be ringing is not ringing or the sound is abnormal, etc. "Smell" is to check whether there is any odor, such as the smell of burning, the smell of capacitor electrolyte, etc. "Touch", is to test whether the temperature of the device is normal; some power devices will heat up when working, if it is cold to the touch, it can be judged that it is not working; if the place that should not be hot is hot or it should be hot The place is too hot, which is also a problem. In addition, you should pay attention when you touch it, try to touch it first, and don't burn your hand.
The above is the method for finding faults in the newly designed 5G circuit board. PCBHERO hopes to help you