i bought an epi lp standard from a pawn shop for 200 dollars, and the only issues i had with it were dirty pots and possibly bad tuners. i fixed the pots with contact cleaner, so now i'm on to the tuners. they are the vintage tulip type. are these all kind of low quality tuners, or are they good? i have an epi sg special that has pretty good tuners so i might swap them.
the vintage ones blow, change them

Epiphone Les Paul Standard
Coming soon: Egnater Tweaker

Tuners arent always the issue. I have a parts strat using squire tuners and it stays in tune. The epi standard should have the decent tuners. They usually come with grovers.