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 Post subject: Re: Freecom xxs 320GB USB failed
PostPosted: April 11th, 2013, 14:59 
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Joined: March 9th, 2012, 5:10
Posts: 24
Location: Netherlands
sathyan wrote:
The chip inductor (the black component)seems to have failed.
You should get around 5v on both sides.
Check with a multimeter, (you should get a low value in resistance range)and if its open, replace it.


Resistance gives me a 1 (in the range of miliohm) so it look like that it's damage.

Does anyone know what sort of component this is?

Thanks


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 Post subject: Re: Freecom xxs 320GB USB failed
PostPosted: April 11th, 2013, 15:05 
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Joined: September 8th, 2009, 18:21
Posts: 11479
Location: Australia
I agree with sathyan, but I would also check whether there is a short between the +5V test point and ground. You might also get away with replacing the inductor with a wire link. I think it's only there to filter noise on the supply line.

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 Post subject: Re: Freecom xxs 320GB USB failed
PostPosted: April 11th, 2013, 16:18 
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Joined: September 8th, 2009, 18:21
Posts: 11479
Location: Australia
clut wrote:
sathyan wrote:
The chip inductor (the black component)seems to have failed.
You should get around 5v on both sides.
Check with a multimeter, (you should get a low value in resistance range)and if its open, replace it.

Resistance gives me a 1 (in the range of miliohm) so it look like that it's damage.

Does anyone know what sort of component this is?

sathyan has stated that it is a chip inductor. It should have a resistance of close to zero ohms. If you are saying that your meter overranges ("1") on the megohm scale, then yes, the inductor is open circuit.

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 Post subject: Re: Freecom xxs 320GB USB failed
PostPosted: April 12th, 2013, 3:30 
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Joined: August 21st, 2012, 12:15
Posts: 276
Location: India
fzabkar wrote:
I would also check whether there is a short between the +5V test point and ground


+1


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 Post subject: Re: Freecom xxs 320GB USB failed
PostPosted: April 15th, 2013, 3:14 
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Joined: March 9th, 2012, 5:10
Posts: 24
Location: Netherlands
After soldering the chip inductor at both sides, the PCB was working fine! The first think i did was made a copy of the disk. I wanna thank everybody for help, and the tips. Many many thanks, i was very instructive and fun to do and to investigate the next steps.

Thanks Christian


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 Post subject: Re: Freecom xxs 320GB USB failed
PostPosted: April 15th, 2013, 4:54 
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Joined: August 21st, 2012, 12:15
Posts: 276
Location: India
Well done,
and remember , regular backups..


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 Post subject: Re: Freecom xxs 320GB USB failed
PostPosted: April 15th, 2013, 5:33 
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Joined: September 8th, 2009, 18:21
Posts: 11479
Location: Australia
clut wrote:
After soldering the chip inductor at both sides, the PCB was working fine!

Interesting. I haven't encountered any soldering related faults in chip inductors, but standard practice for technicians is to resolder the pins of all transformers and coils, eg ...

http://www.p-wholesale.com/upimg/5/119a ... rs-698.jpg

I have also seen numerous cases where the following types of inductors have cracked around the centre of the body:

http://image.made-in-china.com/2f0j00TM ... -150mH.jpg

Anyway, congratulations.

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 Post subject: Re: Freecom xxs 320GB USB failed
PostPosted: April 15th, 2013, 5:49 
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Joined: May 6th, 2008, 22:53
Posts: 2138
Location: England
Yes, congratulations. :)

My vote is that the inductor's soldering was damaged as a consequence of the same bending forces which (as we already know) cracked the solder joints on the mini-USB connector next to it - i.e. this is all the result of external forces on that connector, and not something specific to inductors.


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 Post subject: Re: Freecom xxs 320GB USB failed
PostPosted: September 4th, 2014, 8:21 
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Joined: November 24th, 2011, 19:55
Posts: 12
Location: Indonesia
clut wrote:
After soldering the chip inductor at both sides, the PCB was working fine!


I have same problem, solve now thank you. :good: :-D


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 Post subject: Re: Freecom xxs 320GB USB failed
PostPosted: December 3rd, 2014, 20:58 
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Joined: September 8th, 2009, 18:21
Posts: 11479
Location: Australia
Update:

The "t056" part is a PolyZen (PTC resistor + protection diode).

viewtopic.php?t=30079&p=207705#p207705

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 Post subject: Re: Freecom xxs 320GB USB failed
PostPosted: December 4th, 2014, 3:32 
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Joined: December 1st, 2014, 11:56
Posts: 3
Location: Europe
dataku wrote:
clut wrote:
After soldering the chip inductor at both sides, the PCB was working fine!


I have same problem, solve now thank you. :good: :-D


+1 on a HM641JX Samsung but no damage to the USB connector and never dropped.
Attachment:
HM641JX_BadsolderingInductor.JPG
HM641JX_BadsolderingInductor.JPG [ 1.97 MiB | Viewed 6045 times ]


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 Post subject: Re: Freecom xxs 320GB USB failed
PostPosted: May 3rd, 2017, 17:24 
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Joined: September 20th, 2013, 10:50
Posts: 70
Location: Cuba
Hi, i have the same hdd with the same problem! At first instance, hdd not detected, not spining, not led light.

After resolder usb connector and the mentioned chip inductor led light turn on and hdd spin up, but not detected mass storage device neither usb interface, there is not any signal of data TX RX.

I am suspecting about smd network component connected to data D- and D+ lines in series with 2 ohm resistor to usb bridge. Please, see circled component at bottom image.

This is a black smd network component, so i am thinking in network resistors or inductors and not in capacitors. But resistance value give me around 1.5 Mega, i think this is too high, practically open.

Can somebody point what it is this component?

thanks in advance,
Oleg.


Attachments:
File comment: Need to know about this component
usb question.jpg
usb question.jpg [ 113.46 KiB | Viewed 3623 times ]
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 Post subject: Re: Freecom xxs 320GB USB failed
PostPosted: May 3rd, 2017, 17:54 
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Joined: September 8th, 2009, 18:21
Posts: 11479
Location: Australia
That component looks like a common mode EMI suppression choke.

High Speed USB Platform Design Guidelines:
http://www.usb.org/developers/docs/hs_usb_pdg_r1_0.pdf

BTW, if you are getting nothing from the serial terminal port, then that's another problem. Have you checked the Tx/Rx LVTTL signal levels?


Attachments:
USB2_0_choke.gif
USB2_0_choke.gif [ 12.89 KiB | Viewed 3620 times ]

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 Post subject: Re: Freecom xxs 320GB USB failed
PostPosted: May 4th, 2017, 14:44 
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Joined: September 20th, 2013, 10:50
Posts: 70
Location: Cuba
Well, Common mode shoke in figure you shown should have continuity between in-out points (because after remove it from pcb traces are interrupted), in my case it is open, that´s why i thinking it broken, i will replace it with a 0 ohm resistor and probe.

thanks very much.


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