Unfortunately I have not heard of anyone being able to clean these out and restore them once this happens. Unfortunately this happens pretty often so I suspect you are going to have to replace the screen. The only possible chance you have at this point is to remove the screen and disconnect the wiring and clean any connections that may have anything inside them. Use electrical parts cleaner that you can get at any parts store.
Good luck and keep us posted with what you find. Thanks
Images (Click to enlarge)
Tuesday, September 1st, 2020 AT 5:02 PM