It can be the ribbon cable on the T-CON board is looseor it is not getting 5vdc from the logic board to feed the T-CON board.
http://s807.photobucket.com/albums/yy352/budm/LCD%20panel/
You will need to open it up and take a look inside. It may be still under warranty.
Service manual:
http://elektrotanya.com/?q=showresult&megnev=SAMSUNG megnev2% 20 & = & Category = & LN32A450 kat2 = all
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