Final answer:
First, confirm that the LCD TV is powered on. Second, inspect the backlight function, as this illuminates the pixels. Lastly, check the voltage to liquid crystals and ensure external connections are secure and functioning.
Step-by-step explanation:
If an LCD screen is black and no image can be seen, there are several steps you should check to troubleshoot the issue. First, ensure the TV is receiving power and check if the indicator light is on. If there is power, next you should examine the backlight, as flat screen LCD televisions rely on a large light at the back of the TV that illuminates the pixels on the screen. It's important to determine whether the backlight is functioning. In the event that the backlight is on but there's still no image, the issue could be related to the liquid crystals. These crystals control the passage of light through red, blue, or green filters to create images on the screen. Varying the voltage applied to the liquid crystals can alter the picture contrast. A fault in the power supply to the liquid crystals or in the control circuitry could prevent an image from being displayed. Lastly, check external sources such as cable connections, HDMI ports, and external media devices to ensure they are properly connected and operating correctly.