Dead USRP box?


#1

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#2

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#3

G’day Bob,

this is exactly what happened to my USRP board. The board seems
operational
except it won’t communicate. I’ve ordered the FX2 chip from DigiKey as I
believe it to be faulty. Digikey actually managed to sent me the wrong
part,
a RAM chip, inside an otherwise correctly labled package. The hopefully
correct part is on its way, so it shouldn’t be long until we know if it
fixed
the problem.

It just begs the question, what causes this chip to fail? As described
by Bob,
it was left off for several month and failed on subsequent power up.

Seasons Greetings,

cheerio Berndt


#4

G’day Bob,

yes, the LED is blinking. I’m pretty sure its the USB interface that
died inside the chip. I just can’t explain why as all I did was to
power-up the unit after a few month being left switched-off.

Power supply voltage and current draw all look fine. Will keep you
posted once I changed-over the FX2 chip.

Seasons Greetings,

Berndt

-----Ursprüngliche Nachricht-----
Von: discuss-gnuradio-bounces+wulf=removed_email_address@domain.invalid
[mailto:discuss-gnuradio-bounces+wulf=removed_email_address@domain.invalid] Im Auftrag
von Bob Cameron
Gesendet: Monday, 22 December 2008 11:29 AM
An: removed_email_address@domain.invalid
Betreff: Re: [Discuss-gnuradio] Dead USRP box?

Hi Berndt

Have you heard this happening on more than just our boards? Weird!

I assume you have the same blinking LED so this excludes the EEPROM load
from the problem? I use to work on some Alcatel data radios with the
Altera chips and we had EEPROM failures every now and then.

I have emailed Matt in case he offers a repair service. If not I might
just wait till you have repaired yours.

Cheers Bob

Berndt Josef W. wrote:

G’day Bob,

this is exactly what happened to my USRP board. The board seems
operational

except it won’t communicate. I’ve ordered the FX2 chip from DigiKey as I

believe it to be faulty. Digikey actually managed to sent me the wrong
part,

a RAM chip, inside an otherwise correctly labled package. The hopefully

correct part is on its way, so it shouldn’t be long until we know if it
fixed

the problem.

It just begs the question, what causes this chip to fail? As described
by Bob,

it was left off for several month and failed on subsequent power up.

Seasons Greetings,

cheerio Berndt

On Sunday 21 December 2008 12:48:40 Bob Cameron wrote:


#5

We don’t offer repair services. While it does not happen to many units,
the second-most common failure mode of the USRP is for the USB interface
to stop functioning. We have put static protection on those lines, but
it does not always help. It can be fixed by replacing the FX2.

BTW, the MOST common failure mode is a blown fuse due to the user
attaching the USRP to a 12 Volt power supply.

Matt