rectification in smps

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  • learnmore
    Help choosing replacement transformer for Levoit 600S SMPS
    by learnmore
    Hello Community,

    I'm attempting to repair the SMPS on a Levoit 600S air purifier. The transformer is likely open. It has six pins. 2 pairs on the primary side (one pair tested open) and 1pair of legs on the secondary side. Legs on the secondary side are spread wide apart (end-to-end). I've circled them in blue. Dimentons of the transformer are 22x23mm. Marking on the transformer are EE16 1.9mH-B. Fuse for the powerboard is fuse 250V 3.15A. I've been unable to find an exact match and I'm hoping for some help here to find a suitable replacment.

    Peace
    LM...
    11-04-2025, 09:35 AM
  • abhishekkumar1902
    Huntkey HK340-72FP SMPS shut on load above 2 amps
    by abhishekkumar1902
    I have this Huntkey HK340-72FP PC SMPS where I am facing a strange problem where the SMPS shuts down when the load on any of its 12v output rails goes above 2 amps while the rating of each 12v rail is above 10amps capable.

    I have checked the following:
    1. All output caps are OK, and all output rails read correct voltages at no load
    2. All output diodes are OK
    3. NTC is ok
    4. Hi voltage cap on input correctly reads 150uF on LCR meter per the spec, also the bridge rectifier is OK
    5. No short in main switching MOSFET
    6. All other components...
    12-18-2022, 09:52 AM
  • momaka
    KingWin ABT-650MM 650 Watt ATX PSU [PCB: SW8835REV:A]
    by momaka
    For today's thread, I have a KingWin ABT-650MM ATX PSU. Official web page with the PSU specs is still up and can be found here:
    http://www.rmac.kingwin.com/products.../abt_650MM.asp

    I just can't help it when I see a broken / for parts PSU on eBay that's listed for cheap and looks at least somewhat interesting. Well, OK, I won't lie – on the outside, this PSU looks anything but interesting. It's a plain gray box with colorful “spaghetti cables”.




    What mostly drew me into buying it is its 2x PCI-E power connectors...
    03-29-2022, 11:34 PM
  • Briesmith
    Can High Side damage on an SMPS get across the Transformer to the Low Side?
    by Briesmith
    I have a blown smps and I am looking for some reassurance as to the amount of diagnosis I have to do. It blew the instant I plugged it in not under any load.

    As you can see from the attached pix, the damage is located around the main or bulk capacitor (since removed for testing) and the resistor array/network that drives it (the bunch of SMD components to the left of the YAMAHA YC775 AMPS logo). The burn mark on the frame clearly shows the pins of the capacitor. And, for the avoidance of doubt, there is no way the board could have contacted the frame, it was correctly mounted on...
    05-06-2023, 09:36 AM
  • ohren
    Original Xbox 1.0 PSU: Foxlink FTPS-0002 Rev. B. — 12 V low, 5 V high — transformer?
    by ohren
    Hello!

    I'm looking at an original Xbox PSU: Foxlink ftps-0002 rev. B. The 12 V output is too low, and the 5 V output is too (?) high. Unfortunately I don't have an oscilloscope but only a DMM for diagnosis.

    Measured voltages with no load:

    After rectifier diodes
    12V: 6.17 V
    5V: 5.67 V

    Secondary transformer pins AC measurement (really don't know if this says anything)
    12V: 2-2.5 V
    5V: 1.04 V


    I also have another (working) Xbox psu from Delta. The same measures there, in order, being: 10.79,...
    03-18-2023, 10:33 AM
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