Just because it is lighting the DMX LED without a signal doesn't make it bad. I haven't bothered to look at the chips specs to see if there have been some assumptions made as to what needs to be done to have this LED work because if I'm betting the signal I really don't care. Once it's buttoned up in its case, I'm not going to see it anyway and it it stops working, the DMX tester will show me what the problem is.