Why there is no reaction in the led video wall panels?

LED display control card problem: There are four reasons for this:

1. There are problems in the connection of the cable,
the control card and the module are loose or damaged. It is suggested to plug in the cable again to see if the problem can be solved.

2 2. LED display module damaged,
module short circuit, module chip problems. LED display signal is the input signal transmitted from the output pin of one unit board to another board, so if there is a problem with one board, the whole row behind it will not be bright or abnormal. So when there is a problem with a row of LED displays, we should replace the board that is not normal at the beginning of this row, or jump this board directly with a long cable, and then check whether the board at the back shows normal.

3. LED display control card problem
control card data transmission error, but this situation is relatively rare. Turn on the power and check whether the indicator light of the control card is on; if not, check whether there is 5V power supply and whether the LED display can display the content. If the content can be displayed, the function of the control card display content is good; then use the control card software to find the control card. If it can be found, the function of the control card sending content is good; If you can’t find it, check whether the communication line is connected properly. If it is, it is likely that there is something wrong with the card. As long as these two functions are good, the control card is good. Otherwise, the control card will be replaced.
4. LED display power supply problem
if the power supply is broken, it will directly cause several boards not to light or not normal at the same time, because one power supply controls several boards at the same time. If the LED electronic screen is in the same small area of several boards do not display or display abnormal, it should be considered whether the power supply is broken. The most direct detection method is to take the DC voltage of Wan meter to test whether the output voltage is between 4.5 V and 5.5 โวลต์. If it is not in this range, it is necessary to consider replacing the LED display power supply.