We have news about the “green” screen issue when using VIM3 and the latest Khadas firmware from 0907: https://dl.khadas.com/Firmware/VIM3/Android/VIM3_Pie_V190907.7z
As some users already have seen the colors on using CoreELEC weren’t correct (green). We were searching for a solution to fix our kernel to show correct colors. This wrong colors are introduced by the newest Amlogic patches included by Khadas boot loader and Android kernel.
So everybody who have this issue or even not can try this testing CoreELEC update file. It’s based on latest nightly. The image should work even if you have the old (before 0907) OR the new firmware (0907) installed. Maybe it’s also possible for some users what had need to downgrade because of this issue to upgrade the VIM3 firmware again to 0907 to confirm the fixes are working!
If you updated to this test build please open a SSH connection and post the output of:
dmesg | grep 'com register:'
and tell us your actual used VIM3 firmware and the used TV.
And for sure, please tell us if the colors are correct now 
CoreELEC-Amlogic-ng.arm-9.2-devel-1569389481.tar
CoreELEC-Amlogic-ng.arm-9.2-devel-1569493906.tar
CoreELEC-Amlogic-ng.arm-9.2-devel-1569588153.tar
Thank you for your support!