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Re: Samsung STK392-010 ICs Convergence Issue.
Its a fairly straight forward repair. i would recomend getting your replacement Ics at the following link, as they provide free instaltion instructions with pictures, free shipping and free online instant messageing when you do the repair in case you need assistance. Heres the link. http://servicemanuals.vstore.ca/
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Thats a convergence failure. often you can replace the two Ics and associated resistors to repair the issue yourself instead of replacing the convergence board. But you can get the ICs and resistors from www.tvrepairworld.com which includes free tech support for help installing the parts. They also have circuit boards for most models available if you choose to replace the board instead of trying to repair it.
Have you used 'perfect focus' with no improvement? Are all colors present and correct (other than the convergence)? If so then convergence ICs are the culprit. Replace them both. Yours are Sanyo STK394-250. ($14.51 each at mcmelectronics.com) Do you have any experience soldering or working on electronics? If you do it is a fairly straightforward repair. There are many online resources to assist you. I did one of these a week ago. If I can be of further help post back here.
Have you tried to use the convergence function on the TV? If that has not fixed this issue then you have bad convergence IC chips. These chips are microprocessors that align the blue and red tubes with the green (which is stationary). This converges the three tubes to create the image that you see. Failure of these chips (usually from heat over time) is a common problem with projection TVs. The chips are not very expensive; from $35-60 for the pair. Replacing them involves some tedious desoldering of the old ones and soldering in the new ones. If you have some experience with electronics and soldering it is not hard. Shops will charge $300 and up for this repair. If you want to do it your self post a comment bnack here and I can assist you further.
I had a very simular problem and I managed to arrange it yesterday. Try and check the capacitors in the power supply. I found 2 capactors which I replaced and the picture improved alot. Also the convergence improved alot.
You dont have to remove the aluminum heat sink. The ICs are attached with screws and then just unsolder the ICs from the circuit board and then replace the new ics into the pin hole locations after applying heat sink compound onto the back then screww the new ICs to the heat sinks then solder the pins. Very easy repair.
Replace both convergence ICs nuber STK392-040 that should take care of the problem. you can get new replacement ICs at the following link and they will send free instalation instructions with pictures so you can install the new ICs. heres the link. http://servicemanuals.vstore.ca/
if youre having convergence issues with your samsung HC-P4752W you need to replace both convergence ICs numbers STK392-010 they are available at the following link and they provide free instalation instructions with pics so you can do the repair your self and they also give free tech support in case you need extra help. Its an easy repair takes about an hour from start to finish, Changing the convergence board wont help as the Convergence ICs are located on the sub deflection board and thats about 400 to replace the board compared to 50 to replace the ICs. Heres the link. http://servicemanuals.vstore.ca/
What might be happening is that your convergence is out of adjustment. Before removing the Convergence ICs try to adjust your convergence either from the onscreen adjustment (see your owners manual) or by using a signal generator (if you have one). I am against this "lets start swapping parts out" craze that has become the norm because you never fix the cause of your problem just the symptoms. I would suggest trying to adjust the convergence first.