Making of LED electronic display screen
Author:Xu Jian Time:2021-09-11 14:37 Browse(471)
Step 1: check the power supply voltage, find out the DC positive and negative connection switch power supply, connect the 220 V power line to the switch power supply, (after confirming the connection is correct, connect to the AC or NL terminal), and then plug in the power. You will find that the power supply has a light will be on, and then use a multimeter, dc gear to measure v+
Step 1: check the power supply voltage, find out the DC positive and negative connection switch power supply, connect the 220 V power line to the switch power supply, (after confirming the connection is correct, connect to the AC or NL terminal), and then plug in the power. You will find that a light of the power supply will be on, and then use a multimeter to measure the voltage between V + and V - to ensure that the voltage is between 4.8v-5.1v. There is a knob beside it to adjust the voltage with a cross screwdriver. In order to reduce the screen heating and prolong the service life, the voltage can be adjusted to 4.5v-4.8 when the brightness requirement is not high. After confirming that there is no problem with the voltage, disconnect the power supply and continue to assemble other parts

Making of LED electronic display screen





 







schematic diagram of power connection step 3: connect the control board and the unit board, and connect them with the prepared cables. Pay attention to the direction. Don't reverse the connection. Please note that the unit board has two 16pin interfaces, one is input, one is output, and the one close to 74hc245 / 244 is input, which connects the control card to the input. The output is connected to the input of the next unit board. It's simple. Is to buy their own unit board together in programming.
Related topics