High-definition (HD) projection TVs offer the same HD picture and sound quality as self-contained high-def units, but in a projection TV configuration. As with any complex television unit, you may at times experience certain minor technical issues with your LCD projection TV, including missing channels, poor picture quality or degradation and audio issues. If you use an LCD projection TV and are seeing discolouration on the screen, address the problem using a few basic troubleshooting steps.
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Unplug the audio/video connection cables that attach the device you are trying to watch to the LCD projector. If the device uses RCA cables, they will be coloured yellow, red, and white; component cables will be red, green, blue, red, and white, and will look similar to RCA cables. An HDMI cable will be a single, flat, horizontal cable with a plastic connection on the end. Unplug the cable or cables and check the ends for any damage. Plug them back in and check for any improvement in picture. If you are using component cables, make sure to match the colour of the plug to the colour of the port into which it is being plugged, as mismatched component cables will always cause discolouration on the screen.
Replace the audio/video connection cables with another set and check for any improvement. If you have ensured that the cables are plugged into the projector correctly, probably the next most common cause of picture discolouration is that the cables have simply gone bad. If the discolouration is resolved after replacing the cables, simply continue to use the new set. If not, some further troubleshooting is required.
Check the LCD's other video inputs for any discolouration. This is done by using the input selection control on the LCD projector's remote, usually labelled "Input," "Source," "TV/video," "TV/AV" or the like. Press this button until the TV displays an input into which another device is plugged in, then power on the device. If the discolouration only appears on one video input and replacing the connection cables did not improve the picture at all, the device itself may be the source of the problem. If the discolouration appears on all or several of the LCD's different video inputs, the projector itself will likely need to be serviced.