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cat1x
 Post subject: Unrecognized pendrive
PostPosted: January 24th, 2012, 17:57 
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Joined: December 1st, 2011, 17:40
Posts: 43
Hello, I have a pendrive detected by system, but unrecognized. The device turned unrecognized after plugged, without be damaged

I checked connections and replaced the oscillator crystall, but the problem isn't solved.

Code:
usb 3-1: new full speed USB device using uhci_hcd and address 2
usb 3-1: device descriptor read/64, error -71
usb 3-1: device descriptor read/64, error -71
usb 3-1: new full speed USB device using uhci_hcd and address 3
usb 3-1: device descriptor read/64, error -71
usb 3-1: device descriptor read/64, error -71
usb 3-1: new full speed USB device using uhci_hcd and address 4
usb 3-1: device not accepting address 4, error -71
usb 3-1: new full speed USB device using uhci_hcd and address 5
usb 3-1: device not accepting address 5, error -71
hub 3-0:1.0: unable to enumerate USB device on port 1


Someone have seen this error ever?
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laptokowiec
 Post subject: Re: Unrecognized pendrive
PostPosted: January 26th, 2012, 7:00 
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Joined: October 24th, 2009, 8:16
Posts: 272
Location: Gdansk - Poland
Have you checked with ChipGenius ?

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cat1x
 Post subject: Re: Unrecognized pendrive
PostPosted: January 26th, 2012, 17:07 
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Joined: December 1st, 2011, 17:40
Posts: 43
ChipGenius detects a usb connection but doesn't recognize it. USBDeview neither recognize the device :?
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cat1x
 Post subject: Re: Unrecognized pendrive
PostPosted: January 26th, 2012, 17:34 
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Joined: December 1st, 2011, 17:40
Posts: 43
I tested IC and has 4,5v input signal (the same for R25). Usb connector is ok and connectivity too.
What other components must I check?


Attachments:
usb flash.jpg
usb flash.jpg [ 549.04 KiB | Viewed 9352 times ]
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fzabkar
 Post subject: Re: Unrecognized pendrive
PostPosted: January 26th, 2012, 20:14 
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Joined: September 8th, 2009, 18:21
Posts: 14945
Location: Australia
What's on the other side?

Do you see a linear 3-terminal 3.3V regulator?

What is the supply voltage for the flash memory?

FWIW, here is a block diagram for an SM3254 USB Flash Drive Controller:
http://www.siliconmotion.com/A3.2_Block ... .php?sn=22

It has an internal 3.3V regulator. This means that you should see +3.3V on one or more of its pins. I suspect that your SM3255Q device may be similar.

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cat1x
 Post subject: Re: Unrecognized pendrive
PostPosted: January 28th, 2012, 5:48 
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Joined: December 1st, 2011, 17:40
Posts: 43
In the other site only has the flash chip, D1 and D2 aren't present.

SM3255 has 2 voltage regulator, for 3.3V and 1.8V as you can see here:
http://www.siliconmotion.com/download.p ... YVdWbUM%3D

I tested in all pins 0V, 1.8V or 3.3V, least one of them I measured 0.4V. Do you think is probable this pin should has more voltage?


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usb flash2.jpg
usb flash2.jpg [ 20.63 KiB | Viewed 9307 times ]
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fzabkar
 Post subject: Re: Unrecognized pendrive
PostPosted: January 28th, 2012, 16:00 
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Posts: 14945
Location: Australia
I would test for the existence of +3.3V at each of the capacitors at C1, C2, C3 and BC1, BC3, and BC4.

I would think that the regulators should still be functional even if the oscillator were dead.

If there is no output, then I would test for shorts by measuring the resistance of each capacitor. If the resistances are OK, then I would think that your most expedient solution would be a controller swap.

That said, I'm assuming that 4.5V is an adequate supply ...

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cat1x
 Post subject: Re: Unrecognized pendrive
PostPosted: January 29th, 2012, 12:31 
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Joined: December 1st, 2011, 17:40
Posts: 43
I measured the correct voltage at all capacitors. I checked the resistors and they are ok but there are 2 resistors shorted. One of them is a 0 ohm resistor and isn't any problem. The other one is marked with 2R2 and has continuity, I am not sure it's a problem because I saw this kind of resistors (2R2,5R1,..) shorted in pendrives working...

I think my next option is a controller swap.

Thanks fzabkar
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fzabkar
 Post subject: Re: Unrecognized pendrive
PostPosted: January 29th, 2012, 15:09 
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Joined: September 8th, 2009, 18:21
Posts: 14945
Location: Australia
2R2 = 2.2 ohms
5R1 = 5.1 ohms

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cat1x
 Post subject: Re: Unrecognized pendrive
PostPosted: January 29th, 2012, 17:58 
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Joined: December 1st, 2011, 17:40
Posts: 43
I didn't know this nomenclature :oops: , so... are they used as fuses?
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fzabkar
 Post subject: Re: Unrecognized pendrive
PostPosted: January 29th, 2012, 18:08 
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Joined: September 8th, 2009, 18:21
Posts: 14945
Location: Australia
cat1x wrote:
I didn't know this nomenclature :oops: , so... are they used as fuses?

I find it difficult to differentiate a fusible SMT resistor from a regular one, so I can't answer your question.

In any case, your motherboard's USB port would normally (always?) be protected by a current limiting device such as a 1.1A or 1.6A polyswitch.

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