In most cases, yes, though it depends on what’s wrong with it, the general condition of the unit and your repair budget.
Most faults are repairable and worthwhile. Occasionally though, a combination of faults, condition and other factors may render repairs too difficult, or not viable. Repair costs may exceed the value of a unit for example, or previous repairers have caused damage, rendering further work difficult.
Keep in mind that, whilst I’m here to help, I am not responsible for the condition of your unit or the deal you got when purchasing it. Sometimes, despite spending lots of time and money on something, it remains a poor example. In these cases, it may be best to move it on.