Unrecognized pendrive

[cat1x]

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?

[laptokowiec]

Have you checked with ChipGenius ?

[cat1x]

ChipGenius detects a usb connection but doesn't recognize it. USBDeview neither recognize the device

[cat1x]

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

[fzabkar]

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.

[cat1x]

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?

Attachments

[fzabkar]

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 ...

[cat1x]

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

[fzabkar]

2R2 = 2.2 ohms
5R1 = 5.1 ohms

[cat1x]

I didn't know this nomenclature , so... are they used as fuses?

[fzabkar]

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.