Did you change any of the cabling in the interim between it working and not working?
Did you reset the decoder to defaults by any chance?
It is quite possible that there is nothing wrong with the old tvLINK eye and that all that is wring is power to the tvLINK had not been activated or is not getting to the tvLINK because of a cabling issue.
tvLINK power is only available on the RF OUT port of the decoders. So make sure the cable is on the correct port.
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.