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Re: samsung sp42w5h ghosting
The convergence ICs are usually the problem there are two of them STK392-040 which need to be replaced and possibly the 4 150 ohm 1watt and a couple of the 3.9 ohm 2 watt resistors this is a fairly easy repair if you can solder. You can get replacement parts at the following link and they provide free instalation instructions with pictures so you can do the repair yourself.
here's the link. http://servicemanuals.vstore.ca/
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When it goes black can you see a ghost image? It will be a normal tv picture but very faint black and white looking, you may have to get close and look at an angle to even see it. If so that means your backlight system is failing. If you don;t see an image then it is a problem with the power section of the board inside the tv.
Check if it is covered by warrenty and get a quote if it isn't. A 42 inch is new and big enough that it should still be worth repairing but it may cost you anywhere from $100 to $250 depending on the shop to fix.
It seems your TV Samsung HCM4215W has problem in convergence board and need to be replaced. You can get that board from Parts Store on $76 If you have bit electronics knowledge and know how about tv repair, you can replace it by yourself or get help of local tv tech person.