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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Two-parter regarding flyback focus
My first question concerns something called "dynamic focus". I'm
pretty familiar with what it does - varying the voltage of the beams as they near the sides and corners of the screen to ensure even focus. Does adjusting the flyback mounted focus control interfere with whatever controls the dynamic focus? The reason I'm asking this is because I just performed focus adjustment, per the directions on FAQ, on two NEW sets - my 20" Daewoo and my 24" Toshiba 24AF44 pureflat. The improvement to both was slight but definite. Seeing the skin pores on the faces of people being interviewed by Tim Russert or whoever, on an NTSC standard set of all things, is something I am not used to and quite impressed by! And think about what that does for those car restoration shows when the lights hit the restored fenders on that '69 Camaro. My point is, even factory fresh TVs seem to lack the "perfect" focus necessary to make watching even the 6'oclock news more fulfilling(!) And I've been able to pull back the user sharpness to the half-point and still see almost 3D-like detail. I know my sets don't have dynamic focus but I wouldn't want to mess up one with it. My second question concerns the above Toshiba model 24AF43. For the 6 months I owned the set and after I adjusted the focus, I noticed an almost "misty" quality to the image on this set, particularly when watching broadcasts. Sort of like the dream sequences you seen in a feature picture. Again, NOT blurry - just like a slight mist or fog - especially around anything as light as a human face or lighter - headlights, scenes w/room lighting, sunlight entering windows, or lines framing quotes on the news. I am aware that this set has a non-defeatable SV or scan velocity modulation, and wonder if THAT has anything to do with it. The 20" Daewoo does not, as far as I know, have SVM, but it does possess comb filters as does the larger toshiba, but does not have the misty look to it's image. BTW an explanation of scan velocity mod would be appreciated. Thanks for your patience through my long-winded questions and for any help you may provide. -ChrisCoaster |
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