My TV is a Sylvania C6419TE, purchased new in December 2005. It's worked just fine until about a month ago. One day I turned it on and the colour was totally messed.
I put up some photos in a Photobucket album. There are a few of a random show, showing skies and with the blob visible. There are a few others of the cable box menu with a few different solid backgrounds, so you can see the blob really well.
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As you'll see, there's a magenta blob from the right-bottom edge extending to the middle upper part of the screen. Or, it's a green blob everywhere else. Blue sky displays as bright magenta. Skin tones are greenish except in the part of the screen that's magenta, in which case they're normal-ish. Water displays magenta as well.
I don't even know how TVs work -- do they still use tubes? Do I need tubes replaced? I know that magnetism can affect the picture, but the only things near the TV are the DVD below and the cable box above, and both were present before the colour went awry. No speakers. There could be electrical interference as the TV is against a wall, but again, it was fine for more than a month in its current location. There were no obvious changes made to the setup from one day to the next when it all went to hell.
And yes, I've adjusted the settings via the TV's menu. In these photos everything is set on the default settings dead-centre on each (colour, tint, brightness, etc.)
I have a 13" TV with a dial with 13 channels that my parents bought in 1980 and the colour is better on it than on the TV I actually use.
Does anyone know anything about this stuff? Thanking you!