Wenzhou LED billboard display fault detection method:

1, resistance detection method

Set the multimeter to the resistance level, and then detect the resistance value of a normal circuit board at a certain point, and then detect the resistance value of another piece of the same position for difference, if different, to determine the scope of the problem.

2, voltage detection method

Set the multimeter to voltage, and then detect the voltage at the point of suspected circuit failure, compared with the normal value, to determine the scope of the problem.

3, short circuit detection method

Switch the multimeter to the short-circuit detection gear to check whether there is a short-circuit phenomenon. If found, solve it in time to avoid burning other components. This method needs to be operated in the case of power failure.

4, pressure drop detection method

Set the multimeter to the diode voltage drop detection. If a current passes through a certain point, the pin will have a pressure drop. The pressure drop of the same type of IC is similar, according to the good or bad pressure drop value.

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