For $29/mo, we provide access to advanced level technicians who will answer your questions on any Macbook board related matter to the best of their knowledge promptly & walk you through how to solve your problem so you can deliver a working board to your customer.
Don't waste time checking on the board; you can generate other damage instead.
Nothing wrong there, if you get KB backlight with original screen assembly.
2018 doesn't have True Tone, 2019 and 2020 have True Tone. It seems they are not interchangeable. Extremely hard to buy good LCD assemblies for these machines. Mostly garbage on the market. Get it replaced at Apple.