what causes lcd screen to go black supplier

Black screens appear in the daily work of industrial LCD screens, what should we do? Don’t worry. black screen fault treatment method. Today, we summarize the reasons for the black screen fault treatment method by the failure of industrial LCD screens:

Check whether the power indicator on the host chassis panel is on and whether the power fan is rotating to determine whether the host system is supplied with power. Secondly, the multimeter is used to check whether the external voltage meets the requirements. If the voltage is too high or too low, it may cause the automatic shutdown protection of the main-machine power supply with overvoltage or Undervoltage.

In addition, it is important to check the quality of the power switch and reset key and the correct connection between them and the motherboard, because the power switch and reset key in many inferior cases are often damaged after several times of use, resulting in a black screen display. If the power supply is damaged, replace it.

When the Industrial LCD display is powered up, there is a click sound, and the LCD’s power indicator lights up. When users move to the LCD screen, there is a hissing sound, and hairs on the back of their hands stand up.

If the Industrial LCD screen and speakers within the host let out a long and a short hum industrial LCD screen indicates display card and the connection between the mainboard has a problem, or display card and display this connection has a problem, can be the key to check whether the slot contacts good whether there is a foreign body inside the tank, the display card in a motherboard slot for testing, to determine whether there is something wrong with the slot.

Check to see if the chip on the display card can scorch, crack marks and whether the display card’s cooling fan is working, heat dissipation performance is good. Change a working graphics card to exclude whether the graphics card is damaged.

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Ever had your TV showing nothing but a black screen even if the audio was working? Unfortunately, that’s a common issue with low/middle-end LCD/LED TVs these days… Even more frustrating, this issue often comes from a rather tiny and cheap component that can be easily replaced. Most common issues are:

One of my relatives had this exact symptom happening all of a sudden. This problem on low-end TVs often occurs within the first couple years. As the repair costs for that kind of TV is pretty low, considering repairing it yourself might be a good idea!

The first step into repair is to find the root cause of the issue. As backlight failure is a very common issue, this is the first thing to test. To do so, the easiest way is to power on your screen, put a flashlight very close to it and check if you can see the image through. The image would be very dark, like turning the brightness of the screen very very low.

That implies disassembling the TV to access the backlight which is between the LCD screen in the front and the boards in the rear. In my case, with a Samsung F5000, I had to process as follows:

First we have to remove the back housing to reveal the boards (from left to right: main board, T-CON, power supply) and disconnect the LCD panel from the T-CON board.

Note: Older TVs have neon tubes for backlight, which is thicker and less exposed to this kind of failure. LED backlight is the most common thing these days, but do not mistake an LED TV with an OLED TV. The first one is a classic LCD panel with a LED backlight, whereas the second is an OLED panel that doesn’t need any backlight as it is integrated in each pixels (making the spare parts much more expensive by the way).

As we can see, the backlight system is made of 5 LED strips. First thing to do is look for burnt LEDs. Most LED backlight systems have strips set in series, meaning that if one of the them fails, all the system goes dark…

Using a multimeter, we can confirm that the strips are indeed set in series, so now we have to test each strip individually. Professionals use LED testers such as this one (about 40$ on amazon) but as I didn’t had one at the time, I decided to make one, McGyver style!