Chosen Solution

my phone still works, but the screen has gone black since spilling a small cup of water on it. sound, text and rings all work and am able to have a phone conversation

VERONIKA K, as with any fluid immersion time is vital to prevent corrosion. Rice will not help you. It does not prevent corrosion and will not repair your phone. Use these guides to disassemble your phone. Use some sterile water and rinse all the part. Use 90%+ isopropyl alcohol and a small brush and clean every part, including the ribbon cables as well as the connector. Pay particular attention to the LCD connector. Check for any missing, burned or charred components. Once it is properly cleaned, let it dry. Then reassemble your phone, and it is possible that you have a shorted backlight circuit. If you are handy with a multimeter, we can give you some testing points where you could check the voltage to see if you have power to the LCD. So you may have to start with a new display assembly.

You might be screwed and have to buy a new display or cable, but try first a bag raw rice for a day or so, if that doesn’t work I’ve founded opening it up, cleaning with ethanol, and drying carefully does the trick.