Where did the speaker sound go?

Question

Do it yourself

ancient golden field speakers, model - g8311 (sub + 2 speakers)
replaced the jack, which
lost sound on the speakers in the computer
, but there is sound on the sub and there is
only a slight hum in the speakers and
where to dig everything?)

Answer 1

If after changing the jack the sound disappeared (and it was with the previous one), then it begs to be returned to the previous one.
And this is not a joke, because the main rule of the repairman is: if after some action troubles occur, then to eliminate them, roll back this action.