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How to solve the technical problems caused by manual welding?

How to solve the technical problems caused by manual welding?

1.Inspection of the appearance of the sample. Check the appearance of the solder joints on the board and carefully observe the board with a stereo microscope.

2.Test the circuit board’s reaction. At normal temperature, test the resistance on the board with a multimeter and test the surrounding solder joints to see if there is any fault phenomenon.

 

 

3.AOI checks. X-ray inspection of the board, especially check whether there are abnormal connections near the resistor, whether the connector on the board is abnormal, whether the internal copper wire is abnormal, or whether the resistor is abnormal.

4.Failure recurrence. In order to verify the board failure mode, look for the cause of the failure and perform a constant hot flash test with and without resistance.

 

5月-30-2019

FASTPCBA