What most likely kill the hub? Could it be repaired in general?

It's a Samsung PUH-7000NB.

--
@~@ Might, Courage, Vision, SINCERITY.
/ v \ Simplicity is Beauty! May the Force and Farce be with you!
/( _ )\ (x86_64 Ubuntu 9.10) Linux 2.6.38.2
^ ^ 17:31:01 up 11:42 0 users load average: 1.07 1.07 1.05
�借貸! ��騙! ��交! �打交! �打劫! �自殺! 請考慮綜� (CSSA):
http://www.swd.gov.hk/tc/index/site_...sub_addressesa

Man-wai Chang wrote:

What most likely kill the hub? Could it be repaired in general?

It's a Samsung PUH-7000NB.

Zapped by static electricity, despite the 12,000 volt rating of the
chips?

A surge of current? I had an NEC-based USB 2.0 card lose 2 of its 4
ports because the tiny chip that was supposed to protect against
current surges was damaged by one.

I'd try resoldering the connectors, including the one for the cable.
Also there may be a blown fuse, which could look like a resistor or a
surface mount part.

Sometimes Windows just won't recognize a USB device, so try booting
the computer with an Ubuntu Linux CD.

On 15/04/2011 7:35 PM, Man-wai Chang wrote:

What most likely kill the hub? Could it be repaired in general?

It's a Samsung PUH-7000NB.


Presumably it's powered by a plugpack, which may have died, and be
replacable with something equivalent from your local electronics store.

Otherwise I'd expect it to be beyond salvage.

Sylvia.

On Apr 15, 8:05*am, Sylvia Else wrote:
On 15/04/2011 7:35 PM, Man-wai Chang wrote:



What most likely kill the hub? Could it be repaired in general?

It's a Samsung PUH-7000NB.

Presumably it's powered by a plugpack, which may have died, and be
replacable with something equivalent from your local electronics store.

Otherwise I'd expect it to be beyond salvage.

Sylvia.

The ones I've seen are all powered off the USB connection. And given
the low cost of these not worth trying to fix, even if that were
possible, which I'd say is not
possible. Most likely it's the IC that's bad. Not much else there.

On Apr 15, 4:35Â*am, Man-wai Chang wrote:
What most likely kill the hub? Could it be repaired in general?

It's a Samsung PUH-7000NB.

--
Â* Â*@~@ Â* Might, Courage, Vision, SINCERITY.
Â* / v \ Â*Simplicity is Beauty! May the Force and Farce be with you!
/( _ )\ (x86_64 Ubuntu 9.10) Â*Linux 2.6.38.2
Â* Â*^ ^ Â* 17:31:01 up 11:42 0 users load average: 1.07 1.07 1.05
�借貸! ��騙! ��交! �打交! �打劫! �自殺! 請考慮綜� (CSSA):http://www.swd.gov.hk/tc/index/site_...sub_addressesa

Considering your location...what would it cost you to replace?

Considering your location...what would it cost you to replace?

Don't wanna waste it *IF* it could be repaired easily...

--
@~@ Might, Courage, Vision, SINCERITY.
/ v \ Simplicity is Beauty! May the Force and Farce be with you!
/( _ )\ (x86_64 Ubuntu 9.10) Linux 2.6.38.2
^ ^ 20:51:01 up 15:02 0 users load average: 1.04 1.08 1.12
�借貸! ��騙! ��交! �打交! �打劫! �自殺! 請考慮綜� (CSSA):
http://www.swd.gov.hk/tc/index/site_...sub_addressesa

On 15/04/2011 10:43 PM, Man-wai Chang wrote:
Considering your location...what would it cost you to replace?

Don't wanna waste it *IF* it could be repaired easily...


If you take it apart, you'll likely find that it consists of a single IC
and four USB sockets soldered to a board. There *might* be some capacitors.

There's not a lot there to repair.

You did try a different cable didn't you?

Sylvia.

Man-wai Chang wrote:

What most likely kill the hub? Could it be repaired in general?

It's a Samsung PUH-7000NB.

Hii,
Is you time that cheap? New one may cost ~5 bucks.

"Man-wai Chang" wrote in message
...
Considering your location...what would it cost you to replace?

Don't wanna waste it *IF* it could be repaired easily...

Do you have local recycling centers?

Bribe the site operator to let you have a few discarded hubs, you'll almost
guaranteed find a few are GWO - that way you can save several other people
wasting good hubs and have a couple spare.

On Fri, 15 Apr 2011 17:35:40 +0800, Man-wai Chang
wrote:

What most likely kill the hub? Could it be repaired in general?
It's a Samsung PUH-7000NB.

I haven't done any autopsies on USB hubs. I've never seen one with
just one blown port (unless it was mechanically damaged). What I have
seen are problems caused by:
1. Plugging in the wrong power supply.
2. Applying power to a powered hub from a miswired adapter.
3. Bad electrolytic caps.
4. Miserable ROHS soldering usually combined with flux all over the
PCB.
5. Probable package leakage on the chip.
6. Sometimes, the connectors are hand soldered, which leaves room for
some sloppy soldering.
7. Counterfeit ID code causing operating system to install the wrong
driver. Yes, you need a driver (USBhub.sys) to run a USB hub in
Windoze.

From what I've seen, the last is the most common followed closesly by
the bad soldering.

--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

On Fri, 15 Apr 2011 20:43:34 +0800, Man-wai Chang
wrote:

Don't wanna waste it *IF* it could be repaired easily...

Thank you. It's good to see someone else interested in keeping
electronics out of the landfill by repairing things, instead of just
replacing them.

Much can be learned by simply disassembling the hub. With an
inspection magnifying glass, look for bad soldering. Look for debris
between the IC leads. Twist the board looking for intermittents.
Check if 5VDC power is arriving at the chip. If the board looks
dirty, clean it.

Good luck.

--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558