The most common reason for a "black screen" is a change in the channel's transponder settings. Satellites frequently update their frequencies to optimize bandwidth. If your receiver has the old data, it won't find the signal.
Primarily found on Alcomsat 1 (24.8°W) at 12160 H or SES 4 (22.0°W) at 12672 H . tb6 channel satellite live fix
If your settings are correct but you still have no signal, the issue is likely physical. Transponder details for the new satellite - Freeview The most common reason for a "black screen"
Here is a comprehensive guide to fixing your . 1. Verify Current Satellite Parameters tb6 channel satellite live fix