Common mode choke replacement

[JustinLoos]

Hi, I’m looking to replace a common mode choke to a power supply.

Power supply (315 watt power rating)

Power supply Model # 1920

Power Input (alternating current AC)
100-127V 4.5A 50/60 Hz

Power Output (direct current DC)
200-240V 2.25A 50/60 Hz

I hooked up the common mode choke to a tester. 0.3 omhs   L (inductance) = 7.33mH (millihenry)

I’m struggling to find a replacement. What specs in a common mode choke would suffice a replacement? Current rating (Amps), mH, etc.?

[BertB]

How do you know the choke has gone bad? 0.3ohm doesn't seem unreasonable (considering it is a thick copper wire). You also mention the power supply model is 1920. Is there any more info on this power supply as to who made it?

[fzabkar]

How do you know the choke has gone bad? 0.3ohm doesn't seem unreasonable (considering it is a thick copper wire). You also mention the power supply model is 1920. Is there any more info on this power supply as to who made it?

https://www.eevblog.com/forum/repair/power-supply-repair-(xbox-series-x)/

[ArdWar]

Why do you want to replace it in the first place?

That being said, if your choke was indeed in microhenry range you probably indeed need to change it into something in the milihenry range...

[srb1954]

I hooked up the common mode choke to a tester. 0.3 omhs   L (inductance) = 7.33mH (microhenry)

Is it millihenry or microhenry?

The small "m" is the prefix for milli.  The correct prefix for micro is a lower case "u" or the Greek letter "µ" (mu).

[Haenk]

Before the choke goes bad, the PSU goes thermonuclear. Do these ever go bad?
The measurements look very reasonable, no reason to replace.

[JustinLoos]

The above choke is part of an Xbox series x power supply. My xbox  stopped working after it accidentally fell. I dissembled it down to the power supply. No voltage coming from the power supply. I could hear some rattling inside the power supply. Upon open the power supply the above choke was broken off the board. I would simply solder them on but the legs are way too short. Too short to even add extension.Thus, I’m stuck looking for a choke replacement.

This is what I know about the power supply:

Power supply (315 watt power rating)

Model #
1920

Power Input (alternating current AC)
100-127V 4.5A 50/60 Hz

Power Output (direct current DC)
200-240V 2.25A 50/60 Hz

[JustinLoos]

It’s millihenry (mH) 7.33

[JustinLoos]

That’s my mistake. It’s It’s millihenry (mH) 7.33

[MarkF]

Just a standard Common Mode Choke for EMC purposes to filter noise on the AC input, nothing special. Unwind each side by 1 turn (to keep each side equal) and re-install.

It's just a choke to reduce noise.
Like @Mario87 said, just unwrap one loop from each side to keep it balanced and solder it back in.

[JustinLoos]

Tried that, the black adhesive is rock hard. I ended up breaking 2 legs trying to unwrap them. Then I tried breaking up the black adhesive mechanically but not having much luck.

[BrokenYugo]

I'll hazard a guess you'll be close enough if you try to get the inductance close (give or take a mH), current rating obviously needs to be 4.5A or greater (5 looks common), carefully check dimensions, if the replacement has a base and rigid pins the pin spacing obviously must match the hole pattern and pinout on the PCB.


A parametric search on mouser/Digikey will likely give many good options.

Edit:forgot about pinout, not sure how standard that is.

[JustinLoos]

Thank you!

[wraper]

Even if it cannot be fixed by unwinding a turn, you can simply solder some extension wires or rewind it from scratch. Not to say if you just use 2 jumper wires instead of it, PSU would still work just fine.

[bdunham7]

I’m struggling to find a replacement. What specs in a common mode choke would suffice a replacement? Current rating (Amps), mH, etc.?

5A and up, 5 to 10mH and the correct physical dimensions including lead spacing.  Just use the parametric search on Mouser.  This works electrically, but I don't know your physical dimensions:

https://www.mouser.com/ProductDetail/KEMET/SCT25XV-050-1R0A027JH?qs=QNEnbhJQKvYT82kOc3gDww%3D%3D

[JustinLoos]

Thank you!!! This is very helpful!