ViewSonic n2750 Replacement Transformer

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  • the_rem
    Unknown transformer : how to find a good replacement part ?
    by the_rem
    Hello guys,

    I would like a quite old but still good 800 W ATX PSU to be repaired. The problem was an extremely heavy coil whine coming from the small secondary transfomer on the PCB.

    I desoldered it hoping the references on the upper side would allow me to find a adequate replacement part. Sadly the written references drove me nowhere but to the manufacturer (I-MAG). I sent them a message like a bottle in the see asking them to send me a datasheet of the transformer. And... They responded ! I received a kind of datasheet (see attachment) but my competencies do not allow...
    VEF20FB07BW(2025001A)20110927.pdf
    https://drive.google.com
    04-23-2025, 01:48 AM
  • JDC
    Sony STR-DE697 - Bad Transformer. Replacement? Unknown Value!
    by JDC
    Got a Sony STR-DE697 with a bad power transformer (1-435-281-11). This will be my second receiver with a bad transformer; the first I was able to find a direct replacement off ebay. With this one, nothing has been found except for an old ebay listing for the sub board itself.

    Tried to find a service manual to determine the transformer's specs but to no avail. Tried similar models with the same model transformer but no go.

    So....

    1) How does one determine a transformer's specs (input, output) if there is no information about it available? Are there...
    10-04-2020, 12:36 PM
  • 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
  • mikey5791
    Is it possible for transformer substitution?
    by mikey5791
    Hi all,
    Got this local made DC power supply (12/14V) given free as the transformer has melted. There is no marking or indication to identify what type or rating of transformer used.
    Fyi,. I had a busted autogate mainboard with transformer with marking 13-0-13 . Is this the 13v dc type transformer?
    My questions are
    1. How do i test to see if the transformer is in good working condition?
    2. Can this transformer (marking 13-0-13) be used to replace the melted transformer on the DC power supply?
    Hope you guys understand what i was asking. My intention is...
    11-03-2022, 02:11 AM
  • dennis_elx33
    3PHASE STEP-DOWN Transformer in Check
    by dennis_elx33
    Hello All,

    i would like to post an interesting topic regarding 3-phase stepdown transformer which we suspect to cause an overcurrent (138A) which resulted to power tripped off of the HV power supply (80KV output).


    Problem statement: Power tripped Off

    Initial Problem: Found 2 IGBT and 2 rectifier diodes shorted (burnt).

    Action Done:
    1) Replaced the faulty parts with good spare.
    2) Measured impedance of the 3phase input lines and found that L2 to L3 has 23.3ohm while other pairs are 51Kohm. This pins will...
    12-02-2024, 06:52 AM
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