The upper or lower half of the LED display driver unit board does not light up or displays abnormally, which may be caused by a variety of reasons. Here are some possible causes and corresponding solutions:
1. Power supply problem: First check whether the power supply is stable and whether the power plug and circuit are loose or broken. Make sure the positive and negative poles of the power supply are not reversed and the voltage is stable.
2. Transmission problem: If the power supply is normal, there may be a problem with data transmission. Check whether the data transmission cable is connected correctly and whether it is loose or broken. At the same time, check whether the communication between the sending card and the receiving card is normal and whether the green communication light is flashing.
3. Unit board problem: If the above two problems are eliminated, then there may be a problem with the unit board itself. If the upper or lower half does not light up or displays abnormally, you can check the unit board in the corresponding area respectively. For example, if the upper half does not light up, you can check whether the power supply to the upper unit board is normal and whether the cable connection is connected. If the lower half display is abnormal, you can check whether the control signal of the lower unit board is normal and whether there is any soldering or damage.
4. Driver chip problem: The driver chip of the LED display may also have problems, causing some areas to not light up or display abnormally. You can check whether the driver chip is hot or burned out, and whether there are abnormal high-level or low-level signals.
5. Software setting issues: Sometimes, the software settings of the LED display may also cause some areas to not light up or display abnormally. You can check whether the software settings are correct, including scanning mode, grayscale, brightness and other parameters.
For the above possible reasons, corresponding solutions can be taken. For example, if it is a power problem, you can replace the power supply or repair the line; if it is a transmission problem, you can reconnect the data transmission line or replace the sending and receiving cards; if it is a unit board problem, you can replace or repair the unit board; if it is a driver chip problem , you can replace the driver chip; if it is a software setting problem, you can reset the software parameters.
In short, for the problem that the upper or lower half of the LED display driver unit board does not light up or displays abnormally, it is necessary to investigate the possible causes one by one and take corresponding solutions. If none of the above methods can solve the problem, it is recommended to contact professional LED display maintenance personnel for maintenance.