ChipGenius detects a usb connection but doesn't recognize it. USBDeview neither recognize the device
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| Unrecognized pendrive http://forum.hddguru.com/viewtopic.php?f=10&t=21841 |
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| Author: | cat1x [ January 24th, 2012, 17:57 ] |
| Post subject: | Unrecognized pendrive |
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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| Author: | laptokowiec [ January 26th, 2012, 7:00 ] |
| Post subject: | Re: Unrecognized pendrive |
Have you checked with ChipGenius ? |
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| Author: | cat1x [ January 26th, 2012, 17:07 ] |
| Post subject: | Re: Unrecognized pendrive |
ChipGenius detects a usb connection but doesn't recognize it. USBDeview neither recognize the device
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| Author: | cat1x [ January 26th, 2012, 17:34 ] | ||
| Post subject: | Re: Unrecognized pendrive | ||
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?
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| Author: | fzabkar [ January 26th, 2012, 20:14 ] |
| Post subject: | Re: Unrecognized pendrive |
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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| Author: | cat1x [ January 28th, 2012, 5:48 ] | ||
| Post subject: | Re: Unrecognized pendrive | ||
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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| Author: | fzabkar [ January 28th, 2012, 16:00 ] |
| Post subject: | Re: Unrecognized pendrive |
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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| Author: | cat1x [ January 29th, 2012, 12:31 ] |
| Post subject: | Re: Unrecognized pendrive |
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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| Author: | fzabkar [ January 29th, 2012, 15:09 ] |
| Post subject: | Re: Unrecognized pendrive |
2R2 = 2.2 ohms 5R1 = 5.1 ohms |
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| Author: | cat1x [ January 29th, 2012, 17:58 ] |
| Post subject: | Re: Unrecognized pendrive |
I didn't know this nomenclature  , so... are they used as fuses?
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| Author: | fzabkar [ January 29th, 2012, 18:08 ] |
| Post subject: | Re: Unrecognized pendrive |
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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