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?
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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.Wattevah... -
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Re: the gutless, bloated, and fried power supply hall of shame
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.Wattevah...Comment
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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)
Last edited by Per Hansson; 11-17-2016, 03:37 PM."The one who says it cannot be done should never interrupt the one who is doing it."Comment
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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.PeteS in CA
Power Supplies should be boring: No loud noises, no bright flashes, and no bad smells.
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To kill personal responsibility, initiative or success, punish it by taxing it. To encourage irresponsibility, improvidence, dependence and failure, reward it by subsidizing it.
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Re: Corsair HX 620w burnt coil?
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.)
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.Last edited by momaka; 11-18-2016, 10:50 AM.Comment
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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.Comment
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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.Comment
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Re: Corsair HX 620w burnt coil?
+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=70Last edited by momaka; 11-26-2016, 06:57 PM.Comment
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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!"The one who says it cannot be done should never interrupt the one who is doing it."Comment
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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 lolComment
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Hello!
Does anyone know where I could find this output coil for a Corsair CV650 PSU? I can't find a schematic and there is nothing written on it.
Thanks! -
I have old game console which have connected to 220v outlet by previous owner and It is not able to turn on.
I checked continuity of fuse in PSU unit with a multimeter which is shown in the below picture with a orange circle around it, and It seems that fuse became open circuit.
I also found that as well as bulging capacitor, there is unidentified coil which has residue all over its surface
unidentified coil which has residue all over its surface
I want to replace this round black fuse and unidentified coil if it got broken.
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A "nice" YoungYear unit? - Badcaps
The "new" unit is a KDM-M6480 480W psu, the 480W number is a typical KDM bullshit claim of course, but the 24A rating on the 12V rail seemed reasonable and the "Active PFC" claim gave me a bit of hope that this was going to be decent-ish.... -
Hello everyone,
I'm encountering a frustrating issue with my Corsair SFX 450 power supply. After an undefined period of operation, my PC will either suddenly restart or, in some cases, it won't start at all until I disconnect the power cable and reconnect it. This erratic behavior occurs intermittently, making it difficult to pinpoint the exact conditions under which it happens.
For context, I have tested the PSU using an electronic load at 150W, and under those controlled conditions, it functions flawlessly. This leads me to... -
Hi guys
This Zotac GTX 260 had a high side MOFET on one Vcore VRM phase short circuit Drain to Gate (Not short Drain to Source)
This has burnt out the drive IC L3E (ADP3110A) and also an SOT-23 device very close to the driver IC. According to the PCB markings 'Dxxx' this is likely to be a diode.
Basically the VRM has 4 phases, two powered from one 6 way connector and two powered from the other 6 way
I would assume each pair of phases are basically identical, the burnt out phase has SOT-23 devices WW1 plus the burnt one.
The good phase...
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