PSU issue (I think !)  

PSU issue (I think !)

Hi there, 

I have a Mk3, bought new, factory built, from 2018 (if I remember right) . . . . it's worked just fine for all these years.

Recently, in the last few weeks, there's a loud crackling sound (like arcing) when I switch the printer on, it appears to be coming from the PSU, I quickly switch it off, wait a little and then switch it back on, after which it seems ok, even more recently it's now doing this when I preheat the printer reading for a print . . . it's quite scary (!!!) like electricity crackling and buzzing around !

It's inconsistent, it happens perhaps 1 out of 5 times I switch the printer on.

With the most recent 'event' it left a sort of electrical burning smell coming from the PSU which I could smell from across the room.

Anyone know my best move ? Should I just replace the PSU ? Or maybe open it up and see what's what ?

I contact Prusa support but they were absolutely useless : ) Just some cut and paste auto reply I guess.

Any input from the giant brains of the Prusa forum greatly appreciated.

Lee.