Need help locating a suitable replacement for this inductor

Discussion in 'The Projects Forum' started by adroitful, Feb 5, 2016.

  1. adroitful

    Thread Starter New Member

    Feb 5, 2016
    4
    0
    Okay, so I ordered a couple of broken Xbox One controllers on ebay for a pretty good price. There was absolutely nothing wrong with the first one. It just had sticky buttons. The other one however would not power on. Well, upon further inspection, I realized it was getting extremely hot right next to the d-pad. I figured there was a short in there somewhere and proceeded to take it apart. Once I got in there, I found out it was this 4r7 (Inductor?). It was extremely hot. You couldn't even touch it without burning yourself. So, I desoldered it. Now, I am wondering if someone can help me to find another suitable replacement for it? Also, is it even worth messing with? With that thing going out, would it have possibly fried something else? I noticed every now and then, the power light on the controller would BARELY light up. So I think it may possibly still be good if I replaced this part. Can I just jump this thing? Doub it, but I figured I would ask before I messed things up even more. Some of the inductors have a letter after the 4r7. Example: 4r7k or 4r7j. What is the difference? Would any of these be compatible? Trying to learn something here. Thanks for any help! Anyways, here is pics of what i'm referring to:


    There was 2 of the 4r7 inductors on there. I desoldered one on the right. Can't seem to find one that looks exactly like the one I removed. However, the one still there is the exact same thing. This is the part in question:
    [​IMG]

     
  2. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,980
    744
    Its a 4.7uH inductor, the letter J or K is the tolerance.
     
  3. adroitful

    Thread Starter New Member

    Feb 5, 2016
    4
    0
    Okay. Thank you so much for the help! When replacing it, does it matter which tolerance I use? I have no idea what the original value is here
     
  4. Wendy

    Moderator

    Mar 24, 2008
    20,765
    2,536
    If it is getting hot then there is probably a short elsewhere. Coils look like DC shorts, and react with AC. A common use is to filter power supplies, or make oscillators. It sounds like you have a shorted power supply somewhere else. The coil is probably even OK, if it was hot it was conducting, and carrying too much current.
     
  5. adroitful

    Thread Starter New Member

    Feb 5, 2016
    4
    0
    Well, there's 2 power supplies. Either 2x aa batteries or a standard micro usb cable. One like you would charge an android phone with. The controller will not power on via either of these power sources. I looked around for shorts, but failed to find any. Also, I already pulled and broke the inductor anyways. So I need to find a suitable replacement. Someone on a gaming forum said he had a friend that had to replace them and used these. However, he has no clue how they work. Will these work?
    http://www.ebay.com/itm/400719155455?ul_noapp=true&clk_rvr_id=977452462106
     
    Last edited: Feb 5, 2016
  6. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,980
    744
    Yes will work if they are same inductance, and pinout, the tolerance is best for lower letters, so j is better than k,
    The inductor is probably being driven by a chip or mosfet, which will have blown too.
     
  7. adroitful

    Thread Starter New Member

    Feb 5, 2016
    4
    0
    Okay. Cool. I'll bust out the magnifying glass in the morning and see if I can see any blown mosfets. You guys taught me a bit today and for that I thank you!
     
  8. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,980
    744
    Get a can of freezer spray,and coat the area around the inductor, and power it up, any hot spots will soon show up.
     
Loading...