JIG will only work
if you can get at least in Splash Screen, if it doesn't give any life signal, then I get that you can't get into Splash Screen, therefore, JIG won't do the work.
Here's a video showing exactly the same problem I had and a JTAG repair
Samsung Galaxy S4 - JTAG Brick Repair Service (De…: http://youtu.be/PkfEhu4trRY
There are people who can do the JTAG work, they charge some money but fix it. Even though it is way cheaper than getting a JTAG interface . Buying a device would be way more expensive, and I think it wouldn't be really worth, like you mentioned .
"Time is too short to cry, long enough to try." - March of Time (Helloween)
Sent from my KitKat Nexus 10