you might have fried the backlight chip or the filter.
http://www.youtube.com/watch?v=K4zF3kQrzUo
+
+
+
+
I made a [http://www.youtube.com/watch?v=K4zF3kQrzUo|youtube video on the ipad 2 backlight solution]
+
+
+
if your ipad 2 was short because you forgot to turn off the ipad when changing the screen.
+
+
you want to change and replace
+
+
the backlight chip
+
and the backlight filter
+
+
and then if you ipad had water damage change the backlight 4R7 coil as well.
+
+
+
for more detailed picture showing where the ipad 1, 2, 3 backlight circuits is located please visit [http://cyberdocllc.com|http://www.cyberdocllc.com/ipad-2/]
+
+
+
I have fixed more than 20 ipad 2 logicboards with backlight issues so far. I havent have one fail with this solution just by changing these three surface mount components.