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Improving front USB reliability

Discussion in 'Electronic Design' started by Slater, Jul 18, 2012.

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  1. Slater

    Slater Guest

    My PC's front USB assembly is very unreliable. It looks like this:
    Basically it's just a straight connection. USB devices attached to it
    tend to disappear and reappear at random.
    I had a look at an Asus backplate USB assembly that works much better
    and tried to draw a schematic out of it:
    Though I'm unsure about some of the values. L1 and L2 are SMD parts
    and are marked "4.3" and "100" respectively. C1, C2 and C3 are SMD too
    but they have no markings and I tried measuring them with a lousy

    Do you think the circuit I drew might do? Can I use a 4.7uH coil
    instead of 4.3? What would you do if you should start from scratch?
  2. hamilton

    hamilton Guest

    Pull on all the crimp pins.

    If its loose, its broke !
  3. I have a different problem. We put together 3 new quad core PCs. If
    you use the front connectors ESD freezes the PC.
  4. JW

    JW Guest

    I'm not surprised. Ribbon cable for USB 2.0? How long is the cable? I
    wouldn't connect any USB 2.0 device to that.
  5. Just guessing,
    Did you check the connector pinouts actually match the mainboards headers?
  6. Slater

    Slater Guest

    It's about half a meter, although mine has tinfoil-like shiled and a
    plastic jacket around it. The tinfoil isn't connected to ground,
  7. JW

    JW Guest

    Does it work OK with USB 1.1 devices (keyboards and mice)?
    If it does, and gets flaky with 2.0 devices, I would bet on the cable not
    being apropos for USB 2.0.
  8. Slater

    Slater Guest

    I can no longer test it because I installed a better and shorter cable
    with proper shielding and it's working perfectly!
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