You may not really have a focus problem... To fix it, all you have to do is remove all the screws on the bottom of the screen from the front of the tv. Generally what happens is that the lens on the 3 guns, RGB get dust and crud accumulation on them. All you have to do is get a soft cloth, like a microfiber one to clean it off. I would recommend that you use a mild cleaner and water to clean it. Also the mirror is another thing that you'll need to clean. It too gets dirty, On the lens and the mirror it looks like a white or grayish film that is clouding your picture.
Not good for a non qualified service personnel!
WARNING! focus is close to the HIGH VOLTAGE!
Consider this.... if your TV is more than 5 years old, it maybe the crt is gone?
Those TV has self focus... nothing to adjust what so ever?
Try cleaning the inner lens... might help?
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bueno tengo una television pt4298hd akai el problema no enciende parpadea el foco de timer 10 o 9 veces y no enciende destape la tapa de atras y desconecte un cable rojo que tiene el nombre de screm y la television enciende pero no se mira como debiera porque se mira el color verde y el rojo pero como si le faltara el color azul mi televisor es una dlp akai de tres lentes y quisiera saber cual es el problema
On this model KP-57HW40, if the screen is blue with or without some slight curved trace lines---either you have a bad BLUE picture tube or maybe an adjustment that can restore the set to normal operation.
A lot of these sets had bad picture tubes----if a bad tube they are not available--only way to get one is remove the bad one in the set and have it rebuilt--very expensive and usually not worth the costs.
Let me know---if you go to a unused video input--is the screen Blue with or without faint curved lines?
If it is I can give you fairly easy instructions on how to try to adjust for this-----Understand: if the adjustment corrects the problem you may only be buying some time with this set---if the problem was caused by a bad tube---sooner or later it may come back...
Let me know if you want the instructions and I will post them here for you.
If you try to adjust this you will make more work for yourself. The problem is convergence amps go bad and anything you adjust now has to be readjusted when problem is fixed. Also, convergence problems are a very common problem in all brands of projection televisions, not just magnavox, because the amps run pretty hot holding the colors in aligment. It's unfortunate you had bad luck with this set but we are also now seeing LCD, DLP and PLASMA sets that barely make it through the first year. More and more brands only carry a 90 day warranty now, so they know the life span is decreasing. To repair your set you will need soldering/desoldering equip. and test equip. or you could pay someone with experience 175.00-375.00 to solve your problem for you. That's why we're here. Lots of luck, Russmann.
Why would the set go out of adjustments? I highly doubt if the set needs only alignment. These adjustments are for small drifts only. If anything is way out more then what the on screen can adjust, you have a problem with the convergence correction circuit. There is a convergence power supply in this set that goes bad a lot in these TV sets. There is also a convergence driver board. These RCA sets do not have the integrated IC's like most sets do. Each convergence yoke, horizontal as well as the vertical, has two independent power amp circuits driving them. And that's for all there tubes. So there are 6 separate amps controlling the convergence in these TV sets. You really should call in an RCA authorized repair shop to assist you in this repair. Good Luck