seasonic ssr-1000pd repair gone wrong :( - Page 1
Forum section: electronics / repair

author: jonsig
author_rank: Contributor
timestamp: July 30, 2022, 01:06:52 pm
content: Good day fellow EET´s and electronics enthusiasts ! I was repairing old faulty -mining -oxidized Seasonic 1kW ATX PSU. After i found the fault and confirmed normal operation of the PSU under at least light load, i decided to replace it´s output capacitors for the 12V rail because of their moderate degradation.Even i´m using metcal i had more than usual problems removing the one of the 3.3mF capacitor which was held in place by glue. When pulling the cap with moderate force i snapped in half one of the ferrite. And now .. of course the ferrite inductor has differentproperties compared to flawless part pulled from the same circuit.Im not aware of the switching frequency range of this part in normal operation.But reading with LCR45 on undamaged part @200kHz:Ind/Res 0.01ΩL=~0.07µHBroken inductor @200kHzInd/Res 0.01ΩL=~0.04µHI skipped writing down the complex values because they were fluctuating, and this lcd45 device is mostly hobby grade i think.Not tested the psu under load after this incident, i only have programable electronic load up to 400W and RTX3080Ti/RTX3090 to push the load further. But could become expensive and stupid real fast if the PSU acts up.I guess i have not many options to replace or repair the part. I´m just fixing junk like this and donating it. But i hope some of you have an idea how to proceed with the repair or simply abandon it ?Best regards

author: wraper
author_rank: Unknown
timestamp: July 30, 2022, 01:15:03 pm
content: Likely it's wound on a lossy core so should be a ferrite bead, not a normal inductor. Not like this is some precise part or whatever. You could just glue the core together or leave as is. Worst case PSU will output a little bit more interference which does not really matter.

author: jonsig
author_rank: Contributor
timestamp: July 31, 2022, 01:20:18 pm
content: I assembled the psu with the broken ferrite bead and run it on 50-400W load, just using my Fluke 289 for Vpp measurements. Hooked up at the input on the load, with long probe leads for extra noiseThe avrg. Vpp is around 3-5mV all over the range except the Vpp is staying around 130mV@200W load constant.Voltage is stable @ ~12.03VDC.The broken ferrite bead is parallel to two or -three others similar looking ferrites.I have fully functional Prime "Gold" variant of the same type and generation. Maybe i should use it as referance when trying some ghetto transient load testing or use my Micsig DP10013 High Voltage Differential Probe it´s 1:50 and probably not ideal for ripple measurement.

author: BrokenYugo
author_rank: Super Contributor
timestamp: July 31, 2022, 01:59:57 pm
content: Just glue it back on, thinner the glue joint the better.

author: Twoflower
author_rank: Frequent Contributor
timestamp: July 31, 2022, 02:26:27 pm
content: Maybe you can replace the core from another Rod Core Choke. The most common available ones are horizontal mounted (e.g. Mouser) unless you look to the eastern warehouses. But you might find one with a core with similar dimensions. But I'm assuming that, this is not a RF specific core type and they're similar.

author: wraper
author_rank: Unknown
timestamp: July 31, 2022, 03:39:25 pm
content: Just so you understand why it's not worth to bother. Even if you put a jumper instead of it, PSU will work just fine.