Toshiba 50H81 convergence problem


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Toshiba 50H81 convergence problem

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tboden
New User

Feb 6, 2008, 4:46 PM

Post #1 of 3 (127 views)
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Toshiba 50H81 convergence problem	Can't Post

I have a 50H81 model Television that has a blue shadow on all blue colored video areas. The automatic "Touch Focus" button was depressed to start the convergence calibration. The red and green colors complete their tests while the blue only completes the vertical portion of the test. The fault "Focus Touch error" is diplayed on the screen. A manual test cannot be completed as well. The convergence IC's (STK 392-110T) were bought to rectify the problem. Is it necessary to replace one or both IC's? If so which one? Is there any other circuitry that could be the root cause? The board designations for the IC's are Q751 & Q752. I am looking for a path foward before desoldering any components. Any input is appreciated. Unsure

mikemaiertv
Enthusiast

Feb 8, 2008, 7:07 PM

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Re: [tboden] Toshiba 50H81 convergence problem [In reply to]	Can't Post

Always replace both at the same time and insted of the old STK392-110 use the STK392-150 they are a higher wattage Ic and will last longer
Mike Owens Lead tech Maier TV Spokane Wa

tboden
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Feb 10, 2008, 1:38 AM

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Re: [mikemaiertv] Toshiba 50H81 convergence problem [In reply to]	Can't Post

Both IC's have been replaced. The problem is still the same: Blue horizontal test does not finish its convergence routine. THus, there is blue shadowing on screen during normal viewing. Any other supporting hardware that could be at fault? Such as fuses, resistors or capacitors? Mad

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