Re: [Openeeg-list] [OT] Resetting USB port power?

[mls@VegInfo.com]

Andreas Robinson wrote:
> You have probably fried the transistor (if any) through
> which the current to the USB port flows.

Quite possibly. Another list member in PEM (Private E-Mail), 
alerted me to "Resettable Fuse" on some motherboards and provided
this link  http://www.aopen.com/tech/techinside/r_fuse.htm

I have something similar except the marking looks "1X1" (one "1"
is upside down). According to info on 'net, such fuses apparently
resets themselves. In my case, late last night the voltage came
to 4.78 on that port (but was dropping as the PC warmed up  - it
was 5.02 before the short). Tried to load that port (with 4.6V)
with a USB camera (that works on another USB port on same box).
Voltage dropped close to 0V and is still at that point today.

Guess a resettable fuse does not reset by itself, or it is
faulty on my mobo or there is a trick to resetting these.


> and be prepared to solder SMD parts, risking more than just
> an USB port, if they agree to give you that information.

No kidding. I can't even tell what a USB component is, 
by looking at it :-( So don't feel too adventurous in
soldering an SMD fuse.


> I hope you have some use for these suggestions....

Most certainly, yes! Thanks to everybody who responded.
If I can't get a cheap external USB hub today, I will go
for a wall 9V rectifier with 7805.

das

p.s. Next time, have to be careful not to drop a live wire
     with stripped leads on my metallic letter opener!