I've never used a TL-Electro, but if it has the same setup as my Electro 35's it has an electronic shutter and needs working batteries.
For what it's worth, I've had a spate of Electro 35 failures in the past couple of years: I suspect they're simply wearing out. They're all rather old these days. I had amassed a collection of five of them, mostly from local estate auctions, and keep one in an ever-ready case under the seat of my car as my casual camera. Over the past three years I seem to be averaging one Electro death every 14 months or so: the first was failure of the focusing mechanism and the last two were the electronic shutter. Vibration, probably. Frankly, while I like my Electros and they make good photographs, they weren't the best made cameras of their era, and that era was quite a while back.