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Non provided USB Cable caused "fuse" to blow

STEVE Grody
Prodigy 70 points
Other Parts Discussed in Thread: CC3200

Recently i used the usb cable from my phone charger, to plug the CC3200 into my laptop. (i forgot to bring my provided cable with me)

I got some surge/overload message on my laptop, and i quickly removed it.

Since then, the CC3200 won't turn on, and it looks like a SM component (hopefully just a fuse) blew just behind the micro usb connector below and right of "U1" marking.

Do i have to use the cable that came with the unit, and is this a fuse.    I just got this unit, and hope i haven't done something stupid.

  • 0
    TI__Mastermind 24985 points

    Hello Steve,

    Using a different USB cable should not cause the CC3200 to stop working in and of itself. I have used numerous usb cables (as long as they are USB micro type B connectors) and have never had a problem with it.

    The surface mount component labeled U1 is an ESD diode and not a "fuse". Specifically it is the TPD2EUSB30 You can look further at the components on the board by downloading and looking at the Design Files.

    Just a couple of questions:
    1. To clarify, there are 2 suface mount components directly behind the connector. Are you talking about the middle one?
    2. Is that component completely gone now, or does it just look damaged? It is a very small component
    3. Did that component "blow" right when you plugged in the device? And was this the first time you had plugged in the device? The ESD diode pins are absolute maximum 6V tolerant, so a voltage larger than this for an extended period of time could damage the diode.

    I noticed this USB Microsoft Thread, you may want to check it out. Possibly try plugging into a different USB, if that diode isn't completely fried.

    So, in short, using any cable, as long as it is the proper connector, should work. And the component directly behind the micro USB connector is an ESD Diode, not a fuse.

    Hope this helps.
    Best,
    Michael

  • 0 in reply to Michael J Schultis
    Prodigy 70 points

    Thank you Michael,

    It's the L2 FB SM component (assuming its the lower one when usb port is on the right), and the MS thread looked like the error i saw (i will check logs).  the input end of  it  looks like it erupted, and the trace is orange at it's base.

    The board was working just fine the few times before that when i was testing the out of the box demo apps.

    Could i have shorted something that caused this, while holding the board in my dry hand?  This my first time working with these boards and i hope they aren't that sensitive.

  • 0 in reply to STEVE Grody
    Guru 23000 points
    The component you are pointing to is not a fuse but a Ferrite Bead but in your case acted as a fuse.
    It’s unlikely the power supply/USB connection is the source of your problem but more generated by a Statically Discharge and your ‘dry hand’ helps to generate static electricity.
    One (or more) of the power components in your Vusb has been blown, probably the LDO.
    You can short the Ferrite Bead but you need to supply your board with a ~50mA current limited power supply, or add a 220 Ohm resistor in series with the USB power connection, and measures the voltages.