Not work USB (solved)

[Sergey11]

I got Raspberry Pi in mid-April. Today stopped working USB-port and LAN port. What can I do?

[mahjongg]

Probably a defective 25MHz crystal. Best to send it back under gurantee.

Some people managed to fix it by resoldering the crystal. I suppose you could try that.

[Sergey11]

Thanks for the reply.
Send back the warranty is unlikely to happen, since I'm from Russia. And where the board is located 25 MHz crystal? Where can I find it replacement?

Here's a picture download Raspberry Pi:

[MaxK1]

Underside of the board, marked X1.

[Sergey11]

I apologize for the picture quality. And I think that's it.


Where can I buy a replacement of this crystal?

[MaxK1]

You might not need a replacement - re-flowing the solder _sometimes_ does the trick. I don't know where you can get a replacement, though.

[Sergey11]

Thanks for the reply.

[jamesh]

I got Raspberry Pi in mid-April. Today stopped working USB-port and LAN port. What can I do?

Have you tried reimaging the SD card in case its somehow corrupted?

[Sergey11]

Booting the system is normal, do not work after loading USB and LAN.
Tried to change the image loaded on raspbmc, but due to malfunction USB to configure the system could not.

The SD card is Kingston 8GB, 10 class.

[mahjongg]

I apologize for the picture quality. And I think that's it.


Where can I buy a replacement of this crystal?

Yes, that's the crystal, I don't know just now which crystal is the exact replacement I don't have the schematics here, and I have to at least look at the schematics to look up which pins are used, and also have to measure the package to see what the size is. Most crystals like this are 5 x 7mm, but this one seems to be smaller 3x4mm perhaps?
It will be hard to source one myself in Russia, but perhaps you can buy one from farnell if I can tell you which one is suitable, or you can then find a suitable replacement. In principle almost all 50MHz crystals should work. Start with simply adding more solder to the four pins of the existing crystal, and see if that helps.

[mahjongg]

it is indeed a 5 x 7 mm crystal (25 MHz, not 50 as I said before). the crystal is connected to pins 1 and 3. While pins 2 and 4 are connected to GND (for shielding).

Another observation is that all four contacts are on the short (5mm) end, while many others have the contacts at the long (7mm) end, or on the edges.

Farnell has just one crystal that conforms to these specifications, and can be found here:
http://nl.farnell.com/euroquartz/25-000 ... dp/1640923

the data sheet http://www.farnell.com/datasheets/75371.pdf also confirms that the crystal is connected to pins 1 and 3, and pins 2 and 4 to the metal case (MQ type).

[Sergey11]

Thank you for your help.
The situation has improved somewhat, the keyboard and mouse working.

The following settings:
in /etc/network/interfaces

Code: Select all

auto lo eth0

iface lo inet loopback

iface eth0 inet static
address 192.168.0.124
netmask 255.255.255.0

allow-hotplug wlan0
iface wlan0 inet manual
wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf

and in /etc/environment

Code: Select all

http_proxy="http://192.168.0.142:3128"
ftp_proxy="http://192.168.0.142:3128"
https_proxy="http://192.168.0.142:3128"
rsync_proxy="http://192.168.0.142:3128"

also /etc/apt/apt.conf.d/01proxy

Code: Select all

Acquire::http::Proxy "http://192.168.0.142:3128";

eth0 settings are reset periodically, especially with heavy use of LAN port.


P.S. Sometimes, however, the keyboard and mouse stop working.

[rpdom]

I'm surprised that no one has suggested checking for power issues, what with intermittent functioning USB devices.

As things seem to have gone from not working at all to partly working, that might be the polyfuse resetting after a partial overload.

Can you do the usual checks of the voltage between the two test points (TP1 and TP2)?

[MaxK1]

When both USB _and_ ethernet abruptly stop working (as in Sergey11's case), my tendency is to suspect something around X1 first.

[Sergey11]

Can you do the usual checks of the voltage between the two test points (TP1 and TP2)?

Where is TP1 and TP2?

I measured the voltage between GPIO 2 and GPIO 6. Got a 3.9 Volt

[MaxK1]

TP1 is near the microusb power connector, TP2 is near the RCA video connector. You should be seeing something close to 5V. +/- 0.25V)

[Sergey11]

Thank you for your help.
Measurement was 3.9 volts.

[Maxion]

That's way too low. Should be 5.0V +/- 0.25V.

What's the voltage of of your power supply directly? What's the resistance over the polyfuse?

http://elinux.org/RPi_Hardware#How_Can_ ... dequate.3F

[Sergey11]

The power adapter is 10W USB Power Adapter such as this http://www.sulit.com.ph/index.php/view+ ... 4+IPHONE+5

My power supply directly is 239 volts.

[Maxion]

The power adapter is 10W USB Power Adapter such as this http://www.sulit.com.ph/index.php/view+ ... 4+IPHONE+5

It doesn't really matter what the adapter is, what matters is it's output. If you've bought a knock-off apple adapter it's almost certain that it won't provide 0.5A @5V

http://www.righto.com/2012/10/a-dozen-u ... le-is.html

[Sergey11]

horror

[MaxK1]

"5V @1A" from some of those chargers should be interpreted as "5V or 1A - just not at the same time..."

[remsnet]

"5V @1A" from some of those chargers should be interpreted as "5V or 1A - just not at the same time..."

Buy an 2.5 A that deliver precise 5V regulated .

The CHEAPEST PSU are the WRONGEST PSU for the RPI - if you want an stable RPI


see http://elinux.org/RPi_Hardware

[Sergey11]

Fault lay not in the power supply. The problem was solved by replacing USB-microUSB cable.

Thanks everybody for the help.