I suspect they deliberately used non-matching threads,ie cross-threaded, despite disassembly ideograph of a screw on the pcb overlay and red nail-varnish anti-shake lock. Even 2 minutes of soldering iron tip on the head will not free the locking . And of course buried deep in the case surrounded by all sorts, that block access, to grind flat blade slots in the screw heads or pairs of flats for mole-grips etc. Before grinding off the heads of these screws , any ideas to try.? Good mechanical holding of this pcb is via a large bolt through the main bridge rect, that came away easily, then glue on the shanks of the original screws would do for remounting. The retaining pillars for these pcb screws are welded to the case bottom. Before attacking wiht a grinder I'll try an impact driver, but that is guaranteed to butcher the cross-head slot. It might be easier to grind through the pillars as better access for that angle, not decided yet. Then sleeve over the existing half pillar for reassemble and glue to stop any rattling.
6 years ago