[ailurux]

Hi
Finally, my tangara works!!!
After fixing the extra pixels issue, I noticed another screen problem which makes the blacks seems strange.
There are some starange color banding on it.
Is there any way to fix this?

Hmm, it's a bit hard to tell from the photo (not your fault, taking a photo of the screen never looks like it does irl in my experience), but there is a subtle gradient background on the inbuilt dark theme that may be causing or making the banding more apparent. You could try a theme with a flat background (such as Ayumi's theme from https://codeberg.org/cool-tech-zone/tangara-themes), and see if that helps, or if it at least makes it easier to tell whether it's an issue with the display itself or with the gradient rendering.