Equipment image is unclear include: low brightness, edge of focus, ghosting (streaking), there is a sense of interference fringes stack (high resolution source) or image serrated (dropped frames).

We can not immediately say that a product has a problem, the image displayed is a system, there are video sources such as DVD, video camera, computer, and control transmission products such as matrix switchers, splitters, signal transmission cable, etc., to display terminal.

Common solution is as follows:

Exclusion: exclusion of all devices one by one, first check the source resolution of the resolution is consistent with the display terminal, the only way to form a point of display, the brightness of the image can also be significantly improved if the video signal depends on its the display system is able to adapt to the terminal, if it is not required to display terminal can be increased by switching the device or to change the nature of the signal conversion apparatus, such as the use of the scaler can be improved for the VGA video signal VIDEO signal. Secondly, look at the bandwidth of the signal source impedance and its distributor and matrix switchers, and is able to make the minimum loss of image within the range of the standard distance. Finally, look at the display device of focus and convergence is normal, and a signal processing circuit is good. The most important thing is: in the construction, strict control signal connectors, interfaces, reliable, cable tidy, power lines and signal lines separately, but also to be grounded, such as not using UPS, grounded AC power to achieve common ground , line two well marked, easy inspection and management.

Analysis: According to the symptoms, if not synchronized, synchronous interface with the transmission cable focused inspection equipment, as well as the synchronization frequency range control signal source and display terminal. By analyzing the shorter examination time, image ghosting, to see whether the transmission cable is too long and too small, the solution is to change lines, or increase the signal amplifiers and other equipment. Focus can adjust the display terminal so bad.

A second method is: refers to the overall failure, can be segmented to check, as long as there is a problem assuming a certain period, then check it out later to be ruled out, the problem is resolved, you can save time on checking the other portion.