I would only say "try and" if I thought it was likely that I'd at least make some progress towards the goal.
If I expected failure, I'd instead say "try to" fix it.
If I expected failure, I'd instead say "try to" fix it.
To me, "I"m gonna try and fix it before I buy a new one, but that's probably what I'm gonna have to do" is a fine sentence.
If outcome is considered in terms of success or failure then try implies non-zero probability of failure. If outcome isn't considered in terms of success or failure then "try this flavour of ice-cream" is experience and try this outfit(fits or doesn't) is a test you can't fail. Philosophically, it is as master Yoda said: Do or do not, there is no try.