Picture is not bright

Check its settings. Get into its menu, and select picture settings. Set the color system to 'Auto' there. If wrong setting is done there, only B/W picture will be displayed.

The led backlights may be failing or the driver circuit isn't working. TV Parts Universal TV Stands DLP Chips ShopJimmy You can get parts and led testers here.

In the picture menu you should be able to adjust the resolution.
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First you must connect the antena cable on JVC dvd/vcr ant in and from ant out of jvc connect to TV ant in. Then you must find TV programs on JVC.After that you can record a program and watch another. Be careful you record the program which you find on your JVC.

Most sets have electronic service adjustments. Contact manufacture for nearest service center.

the lens is bad buy a lens cleaner.

check out the tip in my profile or use a wet cleaning tape

If you have pets check your cables and make sure they haven't been chewed on or pulled out or even loose.

Is this when you are watching a DVD, or Tape, or when watching TV using the Combo's tuner? The effect you describe is caused by the video signal losing its DC level.
Hope Ya Fix it.

to turn it off select connection method 3 above and progressive scanning mode, to set the mode, set progressive to off in the display menu so that the p scan indicator light on the front panel goes out. do all of this in interface mode. you can also do this by pressing and holding PLAY > on the front of the unit for more than 5 seconds, still watch for the p scan indicator to go off. this works best when the unit is connected directly to the television.