I had repaired about 10 Z520a that have the same symptom as yours.. It is because the Flex cable damage. The LCD are connected using this flex cable. You can purchase one from shop or at Sony Ericsson shop.
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PLUG YOUR PHONE INTO THE CHARGER WITHOUT THE BATTERY. PUT CHARGER IN AND OUT OF PHONE WHILE CHECKING IF THE SCREEN HAS CHANGED. DO THIS UNTIL SCREEN CHANGES (TAKES ABOUT 5MINS MAX) TO THE MAIN AT&T PAGE. NEXT YOU HOLD DOWN THE POWER BUTTON AND AS SOON AS IT BEGINS CHANGING SCREENS CONTINUOUSLY PRESS THE CALL BUTTON. THE PHONE SHOULD BE BACK TO NORMAL AFTERWARDS. THE ONLY THING IS ONE OR TWO BUTTONS MAY WORK DIFFERENTLY.
Although the water sticker is white - it is possible that the unit got some water through the front. The sticker would turn red if it was dropped in a puddle, not if some water spilled on device when you had it open, say at the dinner table.
Since both screens wont turn on - either the connection from the PCBoard to the screens has frayed - or there was some moisture that entered the unit. Either way - it's not an easy fix. You may need to get a new phone.
the white and black screen issue on the Razr V3xx can be a bad LCD. If the LCD is good then the issue is on the main board. The most common failure is broken contacts on FL6505 and FL6504. resoldering might hold up for a while but replacement is the best option.
the side view clearly shows the damage to the filter. this is only visible after the solder is removed.
Yes, I've seen this happen twice, similarly. When enough shock has been applied to a phone, such as your case, the screen is very susceptable to damage and will need to be repaired or replaced. There's nothing you can do with expertise or spare parts unfortunately, you may even want to look at a new phone if the warranty is out on the phone.
Sorry to be the bearer of bad news.
My Solution: Heat it up by just sitting on it or holding it in your hands// Take the battery out and back in/ Try keeping the battery out of it for a full day My Story :) My mom dropped the phone in the dishes because she was drunk haha, I quickly took out the battery, but when the next day came by I looked at the phone and saw the same problem everyone here has. I kept replacing the battery on the hope it would just magically fix itself. Now 2 days from when it dropped in water, I kept flipping it, replaced the battery again (just taking it out and back in) after I sat on it a while, possibly the heat somehow helped it to work again.. I'm amazed it works haha, it was in the water fully submerged for half a min when I had to snatch it out of the dishes But, it is most likely that I took the battery out, the battery is the thing that ruins electronics, just remember to take it out if you drop it in water. Good luck. If worst comes to worst and your going to buy a new phone, maybe try using a blow dryer on it for a little bit **or just do this in the first place**