It may be that you were relying on coupling from the RF OUT port on the Explora to the RF in port and then into the RF IN port on the HD PVR.
This would have been pure luck if it worked at all.
What you could try would be to move the HB cable to the RF OUT port on the Explora (check that there are no issues with the settings for XV, such as having to change the HB port). Now you should definitely be able to see the Explora on a TV in the bedroom after making sure there are no issues with the choice of UHF channel used for the Explora.
You are not using tvLINKs so there is no issue with DC power for tvLINKs. BUT there may well be an issue with the splitter you are using to split the signal to the two rooms. What sort of splitter is it?
Easyview, UEC 4T HD PVR, SD PVR, XV
Spare decoders: SD PVR(2), PACE HD PVR 4T, DSD 660, 1110, 1131, Explora
2 unmentionable FTA decoders
Win 10 Pro (64-bit) build 1607, version 14393.351
1.2m antenna, 8-way universal LNB, 2x6 MS, FSM permanently connected.