Buknekked sums it up nicely, but as a general rule
yes!
You can give it a shot, but I know my repair guy charges $100 to diagnose the problem! If I choose to get it repair, that go towards the diagnosis/repair. If he says it would cost more to fix than the unit is worth, I am out $100. I wouldn't take that gamble, I would apply the $100 to a replacement instead.
I'm not sure we want to get him started, but
@AcuDefTechGuy will be more than happy to speak of Panurgy!