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Fault to the main power supply regulator section. Either it will be a separate board, or the part of main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.
I have had some problems with tvs taking a long time to start, turned out to be capacitors in the power supply. They leak, sometimes swell up. A kean eye may spot them. not a job for a vovice though. pete
I am an actual Dell repair tech for a non-Dell refurbishing company. I fix this model exact model, as well as all the other plasma TV's that Dell has come out with. If you are looking for a replacement part I suggest starting with either the power supply. But if you are electronicly inclined, I suggest taking voltage measurements across the labeled parts on the power supply that are the following: VS, VSCAN, VSET, VE, and VA. These correct voltage measurements are labled on a sticker in the top right corner of the TV. If they all come out right then your best bet would be the Y-main board with both upper and lower buffers. They are the circuit boards on the left hand side of the TV. As far as getting the parts, thats a whole other story but I hope this helps to narrow down your parts search.