To replace my old fluorescent tube lamp I bought a LED tube. The old fixture was one with an electrical ballast and without an additional starter as shown below.
I read that I was supposed to bypass the ballast completely, as LED tubes don't need them any more. Regardless, I wanted to test whether the tube would work without removing the ballast first and put it in, but nothing happened when I turned it on. Later I tried the tube again in a different fixture with a LED starter and to my surprise it didn't turn on in that fixture either, while it had turned on just fine earlier. Did I break the LED tube by not removing the ballast first or was it impossible to begin with?