Coppell TV Repair LLC offers you a replacement set of inverter boards for your malfunctioning pair of 6632L-0486A (master) and 6632L-0487A (slave) inverter boards as shown on the picture and used in a some 47'' LCD TVs from Vizio, Philips and possibly others.
Those are brand new boards.
Even though probably just one of your original boards has failed - could be either the master or the slave - it is recommended to replace both of them as the reason for the failure in the first place is that it simply wears out and the other board is not far from doing just the same.
We - Coppell TV Repair - specialize in LCD and plasma TV repairs and we have fixed hundreds if not thousands of such boards - locally and through Internet.
Those are brand new parts and we have no reason to doubt their functionality, so we are not testing them indvidually.
In case of DOA issues you are covered by the standard warranty conditions.