source:other news release time:2023-03-23 Hits: Popular:led screen wholesaler
1. Detect whether the line between 138 and 4953 is disconnected or welded or short -circuited.
When scanning, two or several lines (usually a multiple of 2, regular ones) light up at the same time
1. Detect whether the signals of each A, B, C, and D are short circuit.
2. Detect whether the 4953 output end is short -circuit with other output end.
When the LED display has a single or more point (irregular) when it is bright
1. Find whether the control foot measurement corresponding to the module is short -circuited with the Bank.
2. Replace the module or single light.
There is a series or a few columns when the LED display is full of bright
1. Find the pin that controls the column on the module to test whether it is connected to the output terminal with the drive IC (74HC595/TB62726,,,,,,,,,,,, then).
There are single or single columns high, or highlight the whole line, and are not controlled
1. Check whether the column is short -circuited with the power site.
2. Detect whether the bank is short -circuited with the positive electrode of the power supply.
3. Replace its driver IC.
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