We just got a new cable box, and for some reason when there is an image with a lot of white in it, the whole screen will pretty much wash out so you can hardly see anything. I tried changing the settings from 780p to 480p/480i, but that made no difference
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Not clear when you have white lines. While looking on the screen or really on a image. Lots of camera's produce lines on the LCD, when using the LCD to frame the picture. Special when there are small and sharp lights in the image. But the sensor is not capturing that while making the picture. It is a sort of smear on the screen. Also, when you try to make a picture in bright lights, you can get flares, but those you can see on the screen and in the picture. To fight flares, most camera's and lenses come with sun hoods. Your camera does not have a hood, so try to avoid shining bright lights on the front of the lens.
It's not a problem with the white balance.
Is the picture completely white or just overexposed? If completely white, it has to be a problem with the imager (CCD) or the board itself. I have seen some of these with faulty imagers, but the problem is that Canon (at least in some European countries) won't supply these imagers. They replace the whole camera.
The most likely thing is that your screens backlight or inverter has gone faulty.
When you turn it on, you may be able to see a very very dark image of something (best seen by activating the TV menu). On some screens the picture is still far too dark to be visible though.
With this kind of fault, its down to fitting a new inverter, and if that doesn't cure it, then fitting a new backlight bulb (or bulbs) will sort it out, but these are not jobs that can be done without some expertise at them.
Most TV inverters are large circuit boards inside, and take about 20-30 minutes to change as the whole TV has to be dismantled, but the backlight bulbs are much more complicated (and extremely fragile too).
Unfortunately, there's not much else that can be done except trying changing those 2 parts. Although its possible for the screen cable inside to become disconnected and lose your picture, that results in the screen lighting up brightly (usually pure white if the cable comes off completely).
Yes you will get a better picture quality out of a cable box if you get an HD cable box. The reason you are getting the diminished picture is due to the signal you are feeding the TV is an analog signal. The newer HD TV's are made for digital TV and this older technology shows all its flaws on this type of TV.
When you get the new box understand that the same channels you are getting plugged directly into the tv are still going to have some grainy look to them but the good thing is that a lot of them are starting to be rebroadcast on HD channels and that is where your new toy will truly shine.
yes its a cable box problem, find the channel you are having more problems with,press guide in the cable box remote and you will see how the box where the video is will still have the problem and the guide with channels info its going to be clean,
100% weak signal