Ethernet cables don’t get fried. There’s either a short or open and if it’s an older cable it’s probably an open meaning a broken wire. Ethernet cable testers are cheap at a Lowe’s, Home Depot or Walmart but in reality a new Cable is probably cheaper.
Cables do get damaged, as well as the modular cable ends.
A decent Ethernet tester, the last time I bought one, cost me about $100 at Menards. Includes some other features that are handy, like tone generator (for tracing cable). Don;t buy the el cheapo testers. Not worth it.
(A good tester, like the soft the folks on the wifi side of my old employer use to validate cables runs, would cost thousands.)