I used a VIM2 24/7 for about a year, with the firmware shipped on it. Since the first days, I installed the Khadas cooler, without fan.
About 1 week ago, due to the bug related with ethernet connection (I used Wi-Fi before), I just updated it to the newest firmware (v190518), and everything runs OK. The 4K@60fps resolution also worked ok (had some problems on the original firmware).
Now, about 1 week after the update, there are a lot of graphical artifacts, as you can see on this video:
I’m not sure if artifacts are related in some way with the newest firmware, but it worked ok for a week. I tried with alternative power adapter, power cable, HDMI cable and other resolutions, but the problem remains.
Disassemble completely vim and inspect the board carefully, touch the ports, in particular HDMI, it may swing. I noticed that after some manipulations you started to have a problem, remember what could be the reason