Corsair HX 620w burnt coil?

[ABuNeNe]

One day my whole place suddenly blackout and it's caused by my modular PSU. No visible bulged capacitors but there's a burnt coil. It is possible and worth to repair it?

[Dannyx]

Re: the gutless, bloated, and fried power supply hall of shame

One day my whole place suddenly blackout and it's caused by my modular PSU. No visible bulged capacitors but there's a burnt coil. It is possible and worth to repair it?

To my mind, when a coil gets fried like that, it's usually caused by something AFTER it, causing a very high current draw through the coil. Also, the heat has likely taken the insulating lacquer off the windings of that coil, causing a short somewhere in the middle (just a thought). Can't really tell where the coil is located on the board. Could be the PFC inductor which might signal a shorted MOSFET causing that burnout (again, just a thought).

CORRECTION: Had a closer look at the picture and realised that might not be a burn mark at all, but rather an adhesive used to hold the coil together and on the board (have a look at the coil next to it and you'll probably notice the same "goop" on it). It became brown over time due to the heat.

[ABuNeNe]

Re: the gutless, bloated, and fried power supply hall of shame

To my mind, when a coil gets fried like that, it's usually caused by something AFTER it, causing a very high current draw through the coil. Also, the heat has likely taken the insulating lacquer off the windings of that coil, causing a short somewhere in the middle (just a thought). Can't really tell where the coil is located on the board. Could be the PFC inductor which might signal a shorted MOSFET causing that burnout (again, just a thought).

CORRECTION: Had a closer look at the picture and realised that might not be a burn mark at all, but rather an adhesive used to hold the coil together and on the board (have a look at the coil next to it and you'll probably notice the same "goop" on it). It became brown over time due to the heat.

If that coil is not the one causing the problem then I'm not able to identify which component is failing as other looks fine to me. Please see another picture I took.

[Dannyx]

Re: the gutless, bloated, and fried power supply hall of shame

If that coil is not the one causing the problem then I'm not able to identify which component is failing as other looks fine to me. Please see another picture I took.

I'm guessing the inductor in question is in the bottom left of the case in the picture. If that's the case, then that's just an EMI filtering inductor used to suppress any noise on the AC line and those hardly ever fail, which supports my idea of that brown stuff being glue. I'm assuming the fuse on this PSU is blown. If that's the case, then you're probably looking at a shorted bridge rectifier and/or power MOSFETs (should be 3 of them mounted on the heatsink closest to the edge with the inductor) which also explains why you're not seeing any damage (semiconductors like these can become internally shorted even without going BANG and displaying any visible signs of damage - a multimeter on the continuity setting will immediately provide the answer as to what blew)...might be worth a shot repairing it.

CORRECTION (yeah, again): had a closer look at the picture again and saw two other coils before that one, which would suggest the large one (the one you think is bad) is a PFC inductor used to boost the rectified voltage to around 400v. This opens up the possibility of this circuit being bad also, meaning a shorted power diode, a shorted MOSFET (or perhaps two of them) and possibly a busted PWM Ic.

[Per Hansson]

Re: Corsair HX 620w burnt coil?

I created a new thread for you here since it does not belong in "the gutless, bloated, and fried power supply hall of shame" thread. (Those are reserved for Deer and other such gutless wonders)

[Dannyx]

Re: Corsair HX 620w burnt coil?

I created a new thread for you here since it does not belong in "the gutless, bloated, and fried power supply hall of shame" thread. (Those are reserved for Deer and other such gutless wonders)

Gotcha boss

[PeteS in CA]

Re: Corsair HX 620w burnt coil?

Looks to me like the AC inlet (in the picture) is at the top, right. The fuse and filter seem to be along the case right side. If so that would put that inductor in the PFC circuit, where there are fairly high voltages. The inductor may also have two or more windings. All in all, my guess is that arcing happened, and there may be a bad PFC MOSFET, and maybe more than that.

[Dannyx]

Re: Corsair HX 620w burnt coil?

Looks to me like the AC inlet (in the picture) is at the top, right. The fuse and filter seem to be along the case right side. If so that would put that inductor in the PFC circuit, where there are fairly high voltages. The inductor may also have two or more windings. All in all, my guess is that arcing happened, and there may be a bad PFC MOSFET, and maybe more than that.

It should have at least 2 windings: the main one and the feedback one. If they somehow shorted together, the control is definitely toast...

[momaka]

Re: Corsair HX 620w burnt coil?

If so that would put that inductor in the PFC circuit, where there are fairly high voltages. The inductor may also have two or more windings. All in all, my guess is that arcing happened, and there may be a bad PFC MOSFET, and maybe more than that.

Yup, looks like a PFC coil to me as well.

Most likely shorted because of that tan conductive glue, which can actually sometimes eat through the insulation coating of magnetic wire and short the turns on the inductor.

If I am not mistaken, India has 240 V AC, so the easiest fix would be to remove that coil and all associated PFC circuitry (typically a diode and a MOSFET or two). Then wire the bridge rectifier straight to the primary cap. Much simpler and much more reliable.

Or you could try to troubleshoot the PFC... but who really cares about PFC when you have 230/240 line voltage?
(Actually, I know: the power company. For you, it doesn't matter.)

I created a new thread for you here since it does not belong in "the gutless, bloated, and fried power supply hall of shame" thread. (Those are reserved for Deer and other such gutless wonders)

Cool. I was just wondering what happened to that post.
By the way, could you upload the images on badcaps.net and remove the external links from the O/P's post, if possible? It's really bogging down the page loading speeds me, especially on a Wi-Fi connection.

[Bungz]

Re: Corsair HX 620w burnt coil?

Really nice PSU, would be interested if you go down momaka's route and just remove the pfc stuff.

[Dannyx]

Re: Corsair HX 620w burnt coil?

Really nice PSU, would be interested if you go down momaka's route and just remove the pfc stuff.

Provided of course there aren't other problems down the track in the switching part he'll need to fix...make sure you do the series lightbulb test first !

[zx8401]

Re: Corsair HX 620w burnt coil?

The pcb behind the coil looks black, it may be just muck, on the other hand it could be a cremated part.
I would unsolder that coil and look for dead parts.

[momaka]

Re: Corsair HX 620w burnt coil?

make sure you do the series lightbulb test first !

+1
The series incandescent bulb test/trick is a must for any power supply that has sustained primary-side damage.
https://www.badcaps.net/forum/showpo...4&postcount=70

[Per Hansson]

Re: Corsair HX 620w burnt coil?

Happened to stumble onto this thread, exact same failure:
https://www.badcaps.net/forum/showthread.php?t=16655

So maybe try what the OP did there, clean the area up and see how it goes?
Of course follow momaka's advice above when powering it up again!

[Drack]

Re: Corsair HX 620w burnt coil?

I think that's indeed a burnt mark, look at the plastic sheet its dark and kind of melted.
And I would trust what momaka said, you don't really need the PFC, just throw it lol