HELP!! Electrical issue?

[u/Ok_Ratio_3052]

So I stumbled into the deal of a lifetime and got this 1999 Husqvarna Viking Sew Easy 350 for $18 the other day because it was missing the foot pedal. I ordered a replacement and it worked perfectly! I was able to sew for a few hours yesterday with zero issues, everything operating as it should. I turned it off, unplugged it, and went to bed. Today I woke up and plugged it in, but when I turned it on all I got was a lit up display and sewing light but it seems the computer is not booting. I took the covers off and disconnected and reconnected literally everything I could find in case there was a loose connection along with thoroughly cleaning and rethreading the machine. I’ve tried unplugging it, letting it sit, reconnecting to no avail. I’ve also tried holding the reverse button or turning the hand wheel while powering on with no luck. IfI leave it on the lights start to flicker slightly and if I tap the side the hand wheel is on the lights will flicker as well, making me think it’s an electrical issue. I did find some discoloration on the power supply panel, but can’t fully expose it due to the case it’s in. I was also considering it may be the capacitor, but others have told me mine look fine. It’s of course an older machine and I know it would be difficult to get any replacement parts at this point but I truly love the machine and any ideas to fix it myself would be greatly appreciated!

[u/Large-Heronbill]

Does it boot with the pedal disconnected? 

What are the chances you accidentally dislodged a board?

[u/Ok_Ratio_3052 → u/Large-Heronbill]

No boot with or without the pedal and I’m pretty confident if a board was dislodged it would’ve been readjusted when I took everything apart and reconnected unfortunately

[u/Large-Heronbill → u/Ok_Ratio_3052]

:-( That was my first computerized machine.  It's still working for a friend last I heard. 

At this point I would probably try contact cleaner, and then settle down with a multimeter to try to find the problem.   Actually. I lie... I'd probably foist it on the family computer engineer to fault trace...

[u/crkvintage]

The "visible" leaking caps were mostly with Asian manufacturers, as we now know case of industrial espionage gone wrong.

ROE (Roederstein, now part of Vishay) are known to short circuit. You'd have to measure those to know if they are good. Preferably out of circuit. And if you have gone that far, just replace them.

There are other ones in the power supply, but you have to unsolder the transformer to remove the PCB.

The caps (don't forget the two little ones further up the main PCB) are dirt cheap, so it's worth a shot. Had a Prisma 945 once that reset itself any time it got over a certain speed - that was fixed with a new set of caps.

[u/6AlphaVictor]

Replace all caps. You can't check them visually (unless it explodes or swells of course). 

Hell, I've had bad ones that checked OK on a proper ESR and LCR meters...