No I don't repair the encoder but just remove the plug and then place it back. Nothing has been done to the encoder.
In the electrical panel when power on there's no alarm. Please check the attached picture, first one for the electrical panel and the second one for the screen and control panel (back of the screen)
The Panel meaning HDMI or VDU has no power at all ?-------If you open that panel can you check connections and also in the main panel for the Fanuc and see if you took out any fuses >?