Amiga 1200 black screen on RGB output

Black screen on RGB output can be a broken E263R Ferrite Bead (FB200).

Monitor won’t get into RGB mode if there is no 5V on pin 23.

I have seen several Ferrite Beads that were broken, and have a much higher resistance (impedance).

FB removed
New FB placed

After replacement 5V is restored and we have RGB signal again.