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LCD Display Screen Common Faults
Oct 10, 2017

LCD Display Screen common faults

Frequently Asked Questions One: Water ripples and Huaping problems.

The first thing to do is to carefully check the computer around the existence of electromagnetic interference sources, and then replace a video card, or the monitor connected to another computer to confirm the graphics card itself is no problem, then adjust the refresh rate. If you exclude the above reasons, it is likely that the quality of the LCD Display Screen, such as the existence of thermal stability is not good. Water ripple is a relatively common quality of LCD Display Screen problems, they can not solve, it is recommended to replace or repair as soon as possible. Some LCD monitors will appear when the Huaping problem, giving the impression that there is a high frequency electromagnetic interference, the screen is very vague and jagged. This phenomenon is generally due to the digital interface on the graphics card, and through the internal digital / analog conversion circuit and the graphics card VGA interface connected. Although this connection form solves the problem of signal matching, it brings the problem of distortion that is susceptible to interference. The reason is mainly because the clock frequency of the LCD Display Screen itself is difficult to synchronize with the clock frequency of the input analog signal, especially when the analog synchronous signal frequency is changing, if the LCD Display Screen is synchronized, And the graphics card synchronization signal transmission line connected to a short circuit, poor contact and other issues, and can not adjust to follow up in order to maintain the necessary synchronization, then there will be Huaping problems.

Frequently Asked Questions 2: Display resolution is set incorrectly.

As the LCD Display Screen display principle and CRT display is completely different, it belongs to a direct pixel one by one corresponding display. The LCD Display Screen operating at the best resolution converts the analog display signal outputted by the video card into a display signal with the specific address information (the absolute address of the pixel on the screen), and then sends it into the liquid crystal panel to directly display the display signal Added to the corresponding pixel on the drive tube, some with the memory addressing and write similar. So the LCD monitor screen resolution can not be arbitrarily set, and the traditional CRT monitor for the support of the resolution more flexible. LCD can only support the so-called "real resolution", and only in the real resolution, to show the best image. When the resolution is set to a resolution other than true resolution, the display effect is kept constant by enlarging or reducing the screen display range. Such as the LCD monitor at low resolution 800 * 600, if the display is still using the pixel one by one corresponding to the display, then it can only narrow the center of the screen using the center of the 800 * 600 pixels to display, although The picture is still clear, but the display area is too small, not only feel uncomfortable and expensive for the LCD panel is also a great waste. In addition can also use interpolation and other methods, no matter what the resolution is still full screen display, but then the effect will be greatly reduced. In addition, the LCD refresh rate setting and picture quality also have a certain relationship. Friends can be based on their actual situation to set the appropriate refresh rate, under normal circumstances or set to 60Hz best.

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