Common Faults and Solutions of LCD Splicing Screen

2019-08-29 10:59:15 hongling

Common Faults and Solutions of LCD Splicing Screen

Through continuous reform and innovation, LCD splicing wall technology has become more and more mature. Because of the advantages of LCD splicing screen in terms of quality, long service life and price, it is widely used in all walks of life, such as dispatching center, subway station, airport, command center, bar and so on. But occasionally, there are some minor problems in the process of use. There are several common faults as follows:

I. Internal faults and solutions of LCD splicing screen:

A. No electricity (black screen)

It may be that the built-in power supply is not good or the internal drive board of the machine is not good; check method: check whether the power output is normal, if there is no power output, it can be confirmed that the power supply is not good, if the power output is normal, it may be that the drive board is not.

B. Flower screen

If there is no display or abnormal display in a certain area of LCD spliced screen, it is called flower screen. Checking method: Check whether the signal transmission line inserted in LCD screen is loosened or not, which causes bad contact. If this happens, the signal line will be inserted and fixed, and check whether the problem is solved; If not, it may be liquid. Crystal screen is not good.

C. Dark Screen (Screen No Display, Flash Screen)

The LCD screen is always in black screen, dark screen, flash screen and so on when playing advertisements, which is called dark screen. Elimination method: Check whether the power output is normal, if the power output voltage is unstable (voltage value does not reach 11-12V), it can be confirmed that the power supply is not good. If the power output is normal, the driver board and the inverter need to be replaced one by one until the fault is eliminated.

D. No signal

When the power is on, the words "no signal" appear on the screen are called "no signal". Elimination: Check whether the internal video line and the 5V power line input to the decoder board are loose or not. If there is no such phenomenon, the decoder board or driver board should be replaced. After replacement, check whether the failure disappears.

E. Automatically circulate red, green and blue pictures on the power-on rear screen. Removal methods: signal line loosening or bad driving board.

2. Common external faults and corresponding solutions

A. There are pictures but no sounds.

Check if the sound is set to minimum or silent mode and reset the volume mode. If it is offline, no sound will first check whether the external sound line is damaged and the connection is correct.

B. No power, black screen

If the machine is equipped with a timer, it is necessary to check whether the red and green indicator lights of the timer are on at the same time. If only the red indicator lights up and the green indicator lights are not on, it may be a problem of clock setting. Only if the clock is set correctly, the fault can be eliminated. If the LCD splicing screen has software timing function, check whether the clock settings in the software are correct.

When LCD splicing screen appears the above phenomenon, first check the power plug, socket, wiring loosening, whether the switch (OSD button) is open.