1. Incorrect power connection;
2. The controller did not turn off the switch;
3. The power supply voltage is not enough;
4. Resistance short circuit;
5. The line appears leakage phenomenon;
6. If a word or a group of colors are not bright in the running side, it may be that the SCR of the driving road is damaged, and it is more likely that one or more LEDs in the LED string in the word are damaged. The reason for the damage is that the current of the LED is too large, which generally cannot exceed 15mA.
7. If all the lights go out, the internal controller may be damaged.
Due to the above reasons, the led light box does not emit light, so we need to solve them one by one, check whether the power supply is connected accurately, whether the switch controller is closed, whether the power supply voltage is sufficient and stable, check the problem of the resistance wire, and test whether the line has leakage with a test pen.
Here are some other things that don't light up and why:
First, what is the reason why the luminous words are not bright?
1, the lights are completely off: check whether the LED light source line is correctly connected to the transformer or whether there is a virtual welding at a wire port;
2. Sudden and complete extinction: when it is turned on and off during operation, the luminous word will be completely extinguished. This must be a transformer fault, and the wrong wire burned out the LED lamp;
3. Some lights are on: some are on and some are not: this is the reason for LED lights. Adjust the LED light.
Second, how to implement the inspection steps?
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2. Handle the luminous characters carefully and pay attention to the angle. When disassembling the luminous character frame, it must be handled with care, and collision and distortion are prohibited;
3. Whether the power cord on the upper part of the luminous word is in the power access slot and whether the power supply is ready.
4. The luminous words are not bright. Please check whether the leakage protector is closed, whether the wire connector in the plug is loose and whether the input and output connectors of the ballast are loose.
The survey method is as follows:
First, the thread is loose.
(1) First, check whether the serial line used to connect the controller is loose or falling off. (If it turns black during initial loading, it is probably because the communication line is interrupted during communication, so the screen turns black. Don't mistakenly think that the screen body is not moving and the line can't be loose. Please check it first, but it is important to solve the problem quickly.
(2) Check and confirm whether the LED screen is closely connected with the HUB switchboard connected with the main control card, and it is plugged backwards.
Second, the power supply problem.
Please ensure that all hardware, including the control system, is properly powered on. Whether the power light is flashing or not, and whether the power supply is faulty, it is worth noting that this phenomenon is usually easy to occur when using inferior power supply.
Third, the LED unit board connection problem
(1) Several boards are not lit continuously in the longitudinal direction. Check whether the power supply of this train is normal. (2) The horizontal continuous boards are not bright, so check whether the cable connection between the normal unit board and the abnormal unit board is connected; Or whether the chip 245 is normal.
Four, software settings or indicator problems
If there is a clear boundary between the two, the possibility of software or settings is great; If there is a unified transition between the two, it may be the lamp. The above are the reasons why the LED display screen is half bright and half unlit, and the solutions. Investigate the possible causes one by one and locate them quickly. If the problem is due to hardware failure or can't be confirmed, please contact your service manufacturer for technical support.