The cause of the white screen in the operation of the LCD floor-standing advertising machine

With the development of smart cities and the continuous expansion of the advertising market, LCD floor-standing advertising machines have now become the best choice for many modern media and commercial users. Among many advertising machine products, LCD floor-standing advertising machines It is widely used and is also one of the advertising machines that customers like. Under normal circumstances, the reason for the white screen of the LCD floor-standing advertising machine is that a certain resistance of the logic board is burned by the current, so that the LCD floor-standing advertising machine does not light up. So when encountering such a problem, how do you need to deal with the failure of the LCD floor-standing advertising machine? And how should you check out the problem of the white screen of the LCD floor-standing advertising machine?

The following points can be used to analyze the problems of LCD floor-standing advertising machines:
1. Each power supply of the detection logic board;
2. Detect no voltage at VGHP point;
3. Check whether the screen cable is plugged in, and then plug it in again. Pay attention to the side of the screen cable. Don't plug it in reverse. If it is a white screen, try to shut down and restart. It may be that the motherboard has been damaged. You can replace the motherboard;
4. When checking the white screen of the LCD floor-standing advertising machine, be sure to check whether the logic board is intact; see whether the whole machine can be started normally, see the length of time the screen is on, and the white screen, sound and other functions of the whole machine will appear after it is turned on. Whether it is normal or not, determine the fault on the logic board;

5. Check that the VGHP voltage is stable at around 19.5V. If the voltage is not normal, you can be sure that it is caused by the VGHP voltage immediately. If the resistance of the VGHP output terminal is normal, it is a problem with the capacitor CP19. Under normal circumstances, the white screen of the LCD floor-standing advertising machine is caused by the unstable voltage of VGAH. In the maintenance practice, except for VGHP, it is the capacitor CP19. Because of the strong light outdoors, the brightness requirements of the LCD floor-standing advertising machine are relatively high. It can be customized according to customer needs, generally 1500cd/m2-2500cd/m2 (the measurement unit of brightness is cd/m2 (candles per meter square) ), also called NIT lumens.), can still be bright in high definition under outdoor sunlight. At the same time, in order to achieve the visibility of the LCD floor-standing advertising machine, all LCD floor-standing advertising machines are equipped with an automatic dimming system as standard to ensure that the display screen of the outdoor LCD floor-standing advertising machine is visible and eye-catching.

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