Well,
Ended an essay about submarine weapons (torpedoes an Royal Navy SubHarpoons) in the 1982 conflict.
It is here (in Spanish, but Google translator does miracles):
http://www.elsnorkel.com/2013/08/lis...ubmarinas.html
The article is not short, but in a nutshell, the info is here:
In my opinion, torpedoes in the Falklands War / Guerra de Malvinas had the same problems they had in the beginning of both world wars: inmature technology.
Regards!