Focus???problem on samsung hlp4674 dlp television

If you wish to get some details about this, check the site linked here. Adjustment to be done after lamp replacement to DLP TVs are given in detail. http://electronicshelponline.blogspot.com/
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I have samsung TV 40 inches flat screen comes on the picture ok but within 10 minutes the picture goes black and white

The model indicated is a DLP set that uses a Lamp for brightness and has no focus control of any sort.

what is problem and if a DLP set or not.

The tv have a problems known as a convergence problems,it dead.The tv have colors lines R,G,B mis alignments,have colors shadow pictures or 3D pictures look alike?The tv convergence board have dead 2 STK convergence ICS and some or all of it resistors too.These parts on the tv convergence board,must be replaced to solved the tv picture convergence problems.The shop,will cost u like $300-350 for parts and labors.

Did you replace the color wheel with the correct color wheel?

REPLACE LAMP

HDMI cable change its sub standard.

Can't say it's a fix but when you press the tv button to make the picture better, cover the end of the remote and press sky so the tv and box don't pick it up.

It's more of a work around than a fix!

Fuzzy is a funny word. I never use it to describe a picture problem. That because fuzzy can go too many different ways. There is snowy fuzzy, blurry fuzzy, grainy fuzzy, and demodulated fuzzy. If the set goes out of focus intermittently that has something to do with the focus ciruitry. If it goes grainy that is a front end problem, usually tuner related. The other types of fuzzy are generally associated with problems in video processing some where. So, which is it?

Oh, and BTW that unit has three small picture tubes in it, one red, one blue, and one green. It doesn't have a 'bulb'.

use the "Perfect Focus" feature on my TV and let me know what happens