LED display is not bright reasons and solutions

157 views admin 2024-01-05

(1) If there is a problem with the LED advertising screen, you can check it roughly first, and if you finally find that the unit board is not bright, this problem is actually better to solve.

(2) First check the power supply, for example, check whether the unit board is powered, if not, you can view the circuit and check the circuit with a multimeter, if there is no problem, it is ok.

(3) If there is still a problem, you can check the data line, if the surface is damaged or the internal line, you need to replace a new data line.

(4) If it has not been repaired, it should be chip 245 that is broken, check the corresponding foot of 595 with a multimeter to see if it is powered on, if it is not powered on, it needs to be repaired.

(1) If the display screen is not bright, first check the main control business card printing power supply, focus on the control card power supply LED power, if damaged, you can replace a new power supply.

(2) If the power supply circuit of the display body is faulty, check whether there is a problem with the circuit first, if there is a problem, you can carry out the corresponding maintenance.

(3) If it has not been repaired, you can debug the Settings of the computer or control card, focusing on the original data, if the control card itself is damaged, replace the new control card.

(1) Sometimes when watching the screen, the display can only occasionally display a part of the font, which is not complete, affecting the user experience.

(2) When the size of the display does not match the size of the actual advertising information, re-adjust the advertising information, which is generally a design problem.

(1) If the horizontal display is not bright, there may be a problem with the data line between the normal unit board and the abnormal unit board, first check the data line or replace or replace the control chip, if there is a problem, repair or replace the corresponding fault.

(2) If the vertical direction is not bright, you can use the multimeter or test pen to test the LED power supply powered by the unit board, and then replace the parts.

Solution: Check whether the cable of an error module in the signal direction is in good contact with the power cord. If the module does not have an LED light, there is no power input. Check the power supply (check with a multimeter), and if there is a pattern (if there is color confusion), the bright spot indicates that the module has no signal input. Check that the input terminals of the flat cable of an abnormal module are tightly connected. You can plug in and unplug. If there is a problem, you can replace it with a new flat cable.

Solution: Check the power supply of the module. The main thing to do is to check if the power socket on the module is loose. If the color of the entire module is confused or inconsistent (but with signal input and the correct image), it means that the signal transmission line is poorly connected. Reconnect the flat cable or replace the tested flat cable. If the same problem persists after replacing the intact flat cable, check whether there is a problem with the PCB interface.

It will lead to the phenomenon of dead lights, and the playback image is incomplete and unclear.

Solution: Use a multimeter to check whether the LED is damaged. If the bulb is broken, replace it as per item 5 below. With the multimeter set as resistor X1, connect the black test lead of the analog multimeter to the positive connector of the LED and the red test lead to the negative connector (the black pen of the digital multimeter is connected to the negative connector, if the LED is lit, it means that the light is well measured. If the light is not on, the measured light will be broken.