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I have a Sony Projection TV. After the set has been on for a while, the picture takes on a bluish hue and then goes off altogether.

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You have a bad blue tube, you may be able to adjust this and get some more time out of it...If you take the lower front cover off the set you will see a focus block on the inside with 6 knobs. you only one to turn the one that is the blue screen. If you look at it closely you should be able to see the words screen labeling 3 knobs and focus labeling 3 knobs. then you should see B G R labeling the knobs. you want to turn the one that says B, and screen, turn it a little counter clockwise and see if this helps. If you still have the same problem then the only thing to do is replace the blue tube.
Good luck
Tim nolan

Posted on Sep 16, 2008

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Sounds like you have a convergence problem. If you go into the setup menu of your TV, there should be some settings to adjust the red, green and blue hues and re-position them so each color matches up. If this does not work or if you don't have a menu, your TV *might* have a circuit board with several plastic screws on it. These adjust the picture and it's a very tedious task to re-align each hue correctly.

My projection TV is an older model from 1995, which is probably why it has this circuit board in place of a convergence menu built into the TV.

If adjusting the convergence still doesn't work, you might need to purchase a new convergence chip.

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If your TV has a Color Temp setting, you will normally have the following options to select from:
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it must be the problem of convergence in the tv.

for pictures on where is the convergence settings click on this given link.

http://www.somelifeblog.com/2007/06/sony-projection-tv-red-line-repair.html

but if its the problem in convergence board then check out for this link

http://home.earthlink.net/~oleg.filippov/ConvergenceFix.htm

thanks.

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