If your TV seems to be darker than you think it should be, it is possible that the problem is with the light sensor. The light sensor will automatically adjust the picture brightness based on the ambient light that is in the room, (i.e. if the room is bright the picture will also be bright, if it is dark the picture will also be dark).
To turn this feature off go to Settings > General Setup > Light Sensor.
SOURCE: sony bravia
It sounds like the backlight is going bad or possibly the panel. Let me see a picture of it. Talk to you later. Jay
SOURCE: sony bravia kdl 32l4000 - color bars running vertically on screen
In most cases is the screen is covered with vertical lines all the way accross the screen then the T-Con module is at fault. The t-con board is replaceable without having to replace the entire LCD panel which would usually make it cheaper than replacing the TV. The part number I come up with is 1-857-213-11. Please take a moment to rate my answer. Thanks...
SOURCE: what to do if my sony bravia 46 inch gets dark on the right
Your inverter or cfl bulb is out on the right side.
SOURCE: MY SONY BRAVIA TELEVISION SCREEN GOES DARK AND
If it's new it was made sort of ruined. The people who made this T.V. didn't put the color cards in perfectly so the cards just turn on off on off intell the T.V.color pockets are equal. There isn't so many things you could do about it but the best thing to do is just tell the people where you got this T.V. that it turns dark and back. If they don't do anything I guess your stuck with it. I had a T.V. that did that too. We got rid of it because it just bothered sooo it's just up to you.
SOURCE: My 46" Sony Bravia lcd has a dark patch in the
most likely a LCD panel failure suggest calling sony customer support and see about repair accomodation 1-800-222-7669
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