NO Picture with Sound usually means the inverter or a backlight bulb has gone out.
Do you get a picture or some lighting of the screen for a short period (3 seconds or so) when the TV is first turned on?
If so then yes, backlight or inverter. Since you are out of warranty, I suggest shopping ebay for a TV that has a broken LCD panel and removing these parts from that TV.
If you cannot repair yourself, you will definately need to send it in for service.
Also, if you never get a picture or any lighting of the panel, you may have another issue related to the LCD Panel. Either way, Service or Ebay.
By "lighting of the panel" I mean that you will normally notice the LCD Screen will go from a black(LCD bulbs OFF), to a lighter black(LCD bulbs ON). Basically, you will notice the color of the panel change slightly. If this happens, and I am sure it will, then you have the problems described above.
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