Display won't light on, but works when connected to a monitor
I have the MacBook Pro 2016 with touch bar which had water damage that I didn't know of. When I went to the Apple Store, they told me it was covered under warranty and that they would replace the screen. However, I received a phone call the next day where the apple 'genius' told me the computer had severe water damage and it would cost around $2500 to get it fixed.
I went to a trusted 3rd party and had it cleaned for water damage. He told me there was barely any, and that it was mostly on the left side of the computer. Anyways, few weeks after my visit at the Apple Store and few days before I had it cleaned for water damage, the screen totally went black. However, it still works while connected to a monitor. Also, the display itself lights on as long as I do not fully 'open' the lid.
Would this be a 'display ribbon cable' failure? Or would I need to replace the whole screen to have it fixed? I am a student and already spent two years of my savings to buy this computer and thus would like to fix the issue without having to spend too much money. Also, as the computer has had water damage, I assume Apple wouldn't wanna touch the computer anymore?
Regardless, I would appreciate any form of input.