Question about Toshiba 50H72 50" Rear Projection Television

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Blue curving lines at bottom of screen - Toshiba 50H72 50" Rear Projection Television

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It is a common trouble with this set. the problem is a ic STK 392-110 in trouble. to do a good job change both 2.

Posted on May 06, 2010

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Husband cleaned the dust out from behind tv which caused the blue curve not to line up in which he fixed but now how do you correct the blue curve at bottom of screen?


Check pico fuses in front and behing STK ICs STK392-110s Pico Fuses look like resisotors only they will be Green or Yellow 5amps,6amps 7amp pico fuses.

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If the lines are slightly curved and stationary on about 2/3 of the screen its either the Blue CRT or the Blue CRT drive board which is having the problem.

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Do you by chance have any speakers sitting on top of the tv or right beside it. Speakers are unshielded and will cause this effect.

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Replace both STK392-110 convergence IC's with Toshiba or
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This indicates a convergence problem..convergence power supply probally.. however ive seen 2 other cuicits cause this ..

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Are you saying that the whole picture is gone and all you see on the screen are 3 curved lines near the bottom, or is the picture there but 3 curved lines are over the picture, or is the picture there but the bottom of the picture has curved upeards?

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