transformer help 240v to ? charger uk

Discussion in 'General Electronics Chat' started by diesalweasel, Jan 18, 2011.

  1. diesalweasel

    Thread Starter New Member

    Aug 28, 2010
    21
    0
    i there i have a universal charger for a laptop it suddenley stopped working i have dianosed the problem of it being the transformer inside the unit there power going to it but nothing comeing out .the transformer is black with yellow tape wrapped around it soldered to the board.
    the problem i have got is does the transformer come out dc at the other end and plus what transformer would i have to buy
    240v to ?
    here the data of the charger it self
    modle number acd2u120
    input ac110-240v 50/60hz 1.3a max
    output 12/15/16/18/19/20v 6a max dc
    24v 5a 120w max dc
    usb ports 5v 2a dc
    from the transformer it self it got 8 legs what are soldered to the board 4 on each side
    there no number or letters on this thing
    it from china
    i would go out and buy a new 1 but this charger carries 12 diffrent connction and the new one only carry 8 plus this carries usb ports
    i'd be really greatful if any one got any anser for me
    if not is it possible to strip it down
    i take it when these things break is it abreak in the wire in side as it made of wire
    sorry for long post
    regards jamie
     
  2. tom66

    Senior Member

    May 9, 2009
    2,613
    214
    Be very careful with what you are doing.

    You have found an SMPS transformer.

    These are not normal mains 50 Hz transformers and replacing them with such a device will likely lead to failure in the form of a small fireworks display. Instead they are usually rated from 10 kHz to up to 1 MHz and as such are entirely different devices.

    I would suggest you troubleshoot elsewhere as the transformers in SMPS's rarely fail; more likely the device driving them, which is often a MOSFET. Look carefully for a heatsink with a black plastic or metal device attached. Show us a picture of the fet in question; often, a failure is obvious from overheating.

    Also, be careful with mains equipment, but this should go without saying.
     
  3. diesalweasel

    Thread Starter New Member

    Aug 28, 2010
    21
    0
    i there thankyou for your reply MOSFET also know as transister i think not sure tho there is a aluminum plate what is soldered to the board in a (L)shape with mosfet bolded to it 3 of. in one respective i carn't really see how these can drive it but then againe spose it all links up someware down the line . on the out put of this transformer there 4 wires 2 on each side and when it is solder to the board and then each side roles back in to 1 soldered together so if i'm correct it like a postive and a nutural .i'v took some pictures hope this help ps i'v had a multimeter on it and nothink come out the other side
    regards jamie
     
  4. debe

    Well-Known Member

    Sep 21, 2010
    947
    184
    Almost certain the mosfet is on the straight heatsink. Mosfets & tansistors are not the same.
     
  5. tom66

    Senior Member

    May 9, 2009
    2,613
    214
    Can you get a closer pic of the MOSFET? You may have to unbolt it and desolder it.
     
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