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Hi , I`m JackPerhaps I can help you with this problem
The easiest for you really would be to buy the capacitor kit .
It is easy to miss a bad cap , they don`t always show signs like bulging when they are defective .
Get the kit at the link below , it is made for your power board and you could also get a couple of solder kit packs , it has de-soldering braid that comes in handy .
Here is a link for that kit ;http://lcdalternatives.com/Samsung-LN-46A580-LCD-TV-Repair-Kit-Capacitors-Only-Not-the-Entire-Board-P2223292.aspx
Let me know if you have other questions and if not then please do not forget to rate by clicking on the star icons at the top, then click on Submit so i get paid for my time helping you .Also note that it will not close this post , you can come back here at any time if you need further info or help . Thank you
I see that you came to look at my answer , still have questions on this ?