The picture is dark

I'm afraid you can't. The contrast controls will lighten/darken the foreground, but there is no way of doing the same to the background.

The whole point of a webcam is to be able to see the person you are speaking with, and let them see you. When the image broadcasted by your camera is too dark, the person on the viewing end won't see anything but shadows and dark shapes. Learn how to brighten your webcam image so the people you chat with can see you.

Place lamps behind and to the side of the webcam. This casts a light on your face, but the lamps will not wash out the image because they are behind the camera. Turn off lamps that are behind you. You have trouble seeing things when you are looking in the direction of the sun or a light bulb. Your webcam has the same problems. Don't make it stare at a bright light. Open up a white screen on your computer to brighten your face. The white screen will create the brightest possible light from you computer screen and help lighten your webcam image. This option is best when lamps are not available. Open up an empty tab in your Internet browser, or a blank Notepad document, and expand it to the full of your screen. Adjust your webcam settings. The settings available to you will depend on your webcam, but many of them offer a "Brightness" setting that you can increase to lighten your webcam. Open the program that came with your webcam, then look for a "Settings" or "Options" menu. Increase the "Brightness" setting until it has lightened your webcam enough.
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how about in the menu button you can not get an adjustment in brightness control. if the display in the screen is too dark either in any channel or even watching a movie from an input source like dvd player, then i may say that the picture tube need now replacement.

This is an older set------with back off you will see 3 large black cylinders with lens---these are the red, green and blue picture tubes.

Clean the lens with a lens cloth or paper towel with glass cleaner sprayed on the towel.

Annual cleaning of them is suggested as dust or dirty lens will cut down the brightness---this happens gradually over time and will make the picture darker and somewhat dull looking.

I do it with set on but you should UNPLUG SET and just look to see if dust on lens.

Simple and takes only a few minutes.

Let me know what happens.

Steve

seems like its the inverter thats either not working or the tubes are faulty

Use brighten controls on monitor to lighten

It sounds that lamp in TV is weak and not throwing enough light to bright the screen for good image.
How old is this TV and did you replaced its Lamp recently?
If lamp has not been replaced yet or in last 2-3 years, replace it.

Replace the main board

the sound is locked off the TV good picture

Your set may need to have a screen control adjustment. This adjustment is on the high voltage transformer and the back cover will have to be removed a access it. I'm assuming that your set has a picture tube in it- not a plasma or LCD display. If this is the case you can remove the back cover and adjust this control while observing the picture being shown. If you adjust it too high you'll get retrace lines (fine lines going accross the screen). If you're not comfortable doing this or inexperienced, you might want to get a technician to adjust it for you. There are dangerous voltages inside! Stargazer