I dropped my Samsung Gravity in a bucket of water. Yesterday after i dried it, it was fine. But when i turned it on this morning all i have is a white screen. How do i fix it?

Did you try the bag of rice trick?

If it was dropped in water ,it must've fried the power chip.This Can Not Be fixed with a hair dryer...if you take it down to a computer repair shop they coul replace the chip for a price of around $400 (depend whether other parts or circuits have been harmed) I've done this before on my t100 and I spent at least $500 for the chip and the LCD screen.

Actually, the fan shouldn't be working if the water bucket is not installed properly. So, I believe it's more of a case of the electronic controls need to be reset.

To accomplish this, turn the Master ON/OFF Switch to OFF and unplug the unit for 15 minutes.
After the time as elapsed, plug the unit in and turn the Master ON/OFF Switch to ON. The Bucket Full light should not, now be ON. And the unit can function as it should, after you reset the controls for maximum humidity extraction (32 - 35%).

Hope this helped you troubleshoot and solve the problem. Please let me know. Thanks.

Unless it can be 100% gravity feed (1 inch drop per foot) you might need this:

Part: WPL8212501
Fits Maytag M7DH45B2A (Click images to Enlarge)

Description:

Pump-drain

No. in Pack:

1

Additional info:

Dehumidifier pump assembly conveniently attaches the pump kit to you dehumidifier. connect a run hose to a nearby sink, pump, or floor drain. this pump will push water through a hose to up to 18 vertical feet for drainage through a window.
Stock Status: In Stock

Price:

$107.79 -
This part is also known as:
8212501

If you can gravity feed it and can get a hose around the output pipe then any flexible hose will work that is slightly larger than the output pipe.

REPLACE THE DISPLAY PANEL AND CLEAN THE BOARD USING SPIRIT AND DRY.iT WILL SURELY WORK.

Door will not open due o water in the machine .drain it Manully drop down hose to floor level with a bucket it should drain due to Gravity,this will now allow door to open next remove check/clean filter pump....

When you turn on the phone you fried the screen so give the tested before you replace the screen.

dear,

if your phone dropped in water then the first step to be done is immigately remove the battery and then let it dried through a table lamp. you should keep it under 100 W test lamp at a distance of 5-6 feet. if it worked fine after dropping in water and again shut off then open the cover and do this method..

goodluck....

SIM is probably bad or a little wet. but wait and let everything dry out and see if it works. Mine was soaked and the next morning worked fine. at least you probably won't have to buy a new phone.

DO NOT USE HEAT. You will damage the tiny components of your phone. 
The best thing to do is that the moment you get water in your phone, disassemble it. Remove the battery as soon as possible. this is very important. Then, open the casing and seperate whatever you can, like the memory card, the back cover, the keypad etc. Shake out any water that you can from the openings. When you shake it you will most probably get some water out. 
Now, use a dry cloth to dry your phone. Dry as much as you can.

Next, take a bowl and fill it with dry, uncooked rice. Yes, rice. :) Put your unassembled cellphone in this bowl. All of its parts should be in the rice. Now leave this overnight atleast. If possible, leave it for 2 days.
Then, assemble your phone again. It should work fine now. Atleast mine did. :)
Hope it works for you too.

Plus, as you have already done the first part and dried it, just leave it open under a fan etc overnight and it will work fine.