Since it sounds like you have access to the converter, is there a manufacturer/model number listed (often on the back of the unit)? This should lead you to a manual with a quick internet search. That manual might give you troubleshooting instructions for your specific model.
Another test; can you attach a 12v battery even temporarily? If you have a 7-pin harness, your TV can also energise the 12v circuit. If you get lights or other 12v sources with your TT or battery attached, then it is most probably the converter.
Also, the converter may have 12V output terminals that attach to the fuse block. If there isn't 12v there, then the problem must lie with the converter. However, as Grumpy says, there may be a switch, fuse, or circuit breaker internal to the converter as well. Look for that (ideally in the manual if you can locate it).
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2011 Jayco X19H (purchased 2015)
2008 Jayco 1007 PUP (purchased new, traded for the X19)
2018 Nissan Titan Midnight Ed.
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