Mmitsubishi TV Blank screen

Check the video in sockets on the TV. Some do actually have two, usually one at the back and the other on the front or side of the set.
When new they tend to be a little tight and people usually resort to twisting the plug to remove it. This can often twist the cable off the video in socket inside the TV.

Make sure the set is switched off and remove the back. Take a look at the cable running to the video in socket and see if it's connected. If not then simply resolder it back on.

It may not be the cure but always look for the easy way first.

BMW

Not easily, unless you can provide more detailed troubleshooting data.
What test equipment do you have and know how to use???
Oscilloscope?
DMM?
Isolation transformer?
ESR meter?
If you can "assist" with the troubleshooting I am certain that you can recieve repair suggestions.