I had the same issue, i'm still using in 2019.. and all in Sudden no signal started appearing.. I tested all possible methods, but none of them worked.. today in morning, I opened my garmin's GPS module, and the cable was out form the circuit.. I fixed that back and wow.. it worked great.
You should have tried this too.. like open the garmin screen, and then check if cable is fully afixed or not.
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