Any home appliances in the use of a long time will appear such problems, LED electronic screen for rental and fixed led walls is no exception, the following is a brief introduction of common problems when you run the advertising led display screen panels for commercial led video walls.
1、 not turning on
Phenomenon: there is no difference between pressing the power switch and not pressing it. The whole circuit does not work
Test: the output of the test power supply is abnormal. Test the two ends of the filter capacitor, with a single output of 12-24V. Two way rectifier diode 5V, 12V.
Easy problems:
1. Insurance
2. Large filter capacitance
3. There is a problem with the MCU of the drive board
2、 Dark screen fault
Phenomenon: the screen is dimmed after the power on. The image system is normal, there is no backlight, and the light tube is off. Power light green
Inspection idea: power supply – high voltage board – lamp
testing:
1. The normal output voltage at both ends of the capacitance is 5V, 12V
2. 300V large filter capacitor
3. Lamp problem
4. High pressure package problem. VR adjustable resistance becomes larger. Especially close to the lamp connector.
5. High pressure switch tube
3、 Flower screen fault
Phenomenon: there are stripes or stripes
Inspection idea: power supply – drive board
testing:
1. Power filter capacitor leakage, discoloration, foaming
2. Drive board, screen wire, circuit board
3. Image processing main chip, input and output failure. Low probability/
4. The interface problem of LED electronic screen and cable often occurs
5. LED electronic screen itself, screen circuit chip has problems.
4、 White screen fault
Phenomenon: no signal. Backlight is normal
Detection: image processing problem. Same as the screen
The LED electronic panel circuit board “power supply fuse” is burnt out.
The signal conversion chip is broken.
5、 Black screen fault
Phenomenon: the green light is on, and there is nothing on the led video screen
Detection idea: the backlight and image are abnormal, and there is a high probability of sharing some problems
Test: test the output voltage of the power supply
Drive board problems
Today’s FAQs are all about this. I hope they can help you
