It sounds like old uncle
Can you provide more details so we can help to figure out the issue, even simple information will be helpful:
- ROM version you installed
- Screen model you used
BTW, did you try with another HDMI cable?
Screen : AOC F22 (use VENTION HDMI to VGA apdater)
ROM : VIM1_Ubuntu-xfce-bionic_Linux-4.9_arm64_EMMC_V20190604
I haven’t tried another HDMI cable, , but it works fine on my computer, I think I should try with my TV.