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The monitor needs a signal ( source), i.e., DVD, TV, to show a picture. If your monitor shows no signal then either the source is not connected or not functioning. Check the connections from the monitor to the source. Also, check that the source is functioning properly and is receiving power.
A Digital Screen is one where the data provided is in a Digital Word format, and is converted via Digital to Analog converter to produce a signal, to display an image. . Now an Analog Monitor directly takes a varying Analog, voltage, signal, and uses that to display and image.
It is probably that the parking safety wire wasn't hooked up properly, or at all. Most in dash dvd players are equipped with a motion safety device to prohibit the driver from viewing movies and such on the monitor while the vehicle is in motion. The wire for this needs to be hooked to the parking brake light wiring. This will ensure that when the parking brake is on, the dvd can sense that the vehicle is stopped, and should therefore show the image.
To fix this issue on the back of the double din touch screen#uv8020, splice the pink wire, and splice into the (black) ground wire connecting them together. This will enable you to watch dvd;s whie driving.