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Check whether the audio is muted by accidental press at remote control button. Enter its sound menu, and check it. If muted, as you know there will be no audio output. If not muted, check the speaker/s. If found OK; check and replace the damaged component/s at its audio output section circuit board. If needy, replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
You have a couple of problems if you are sure there are 2 different blink codes. 13 blinks indicates a backlight balancer error which would explain your no light condition. 14 blinks would be a TCON board error which is the driver board for the LCD screen. Either error would keep the screen black.
Sounds like a back light failure. To verify this, turn on the set, dim the lights in room. Shine a bright flash light on the screen, if you see a faint picture on the screen, you have a back light failure. You either have a blown back lamp, 24v circuit fault, or a failed inverter board.
It will be either BM board (Video Processor board) or Tcon Board (top side of panel). I have similar problem...my TV turns on, lamps turns on (you can see them from back side panel holes) but just a dark blue picture appears with no image (like picture when external input is selected without signal), no OSD appears....some times I can heard audio (using Antena).
I'm thinking getting the BM board.
There is no way to really check a T con without a lot of test equipment, only thing that is serviceable on that board is the small fuse that is by the LVDS connector...
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