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The liquid crystal itself does not emit light, and the display of the image and the brightness adjustment of the liquid crystal are dependent on the brightness of the backlight. In the work of the liquid crystal display, backlight lamp emits light through the LCD screen, the LCD screen display image content that catches people's eyes, then we can see LCD display text and images. If the backlight is damaged, there is no light, then we can not see anything. However, if we carefully observe the LCD screen, you will see a light on the LCD screen display, then it shows that the relevant circuit of the backlight. If the backlight circuit is in good condition, and the display circuit part of the problem, then we will see a bright white light emitted from the back of the LCD screen. The failure of liquid crystal display is mostly the problem of backlight circuit or power supply, the most likely of the backlight circuit fault is the internal circuit or circuit breaker.
First, the liquid crystal display separate power, to observe the failure phenomenon, whether there is a failure of the above performance. Then with the host connection signal line, turn on the monitor, observe the display of the power indicator light is always green, LCD screen have image display (although the backlight lamp is damaged, but through the careful identification, revealed a faint images).
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