Difference between revisions of "R-Pi Troubleshooting"

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(Keyboard randomly repeats key presses: Current draw is in mA, not in mAh.)
(Raspberry Pi shuts down soon after booting up)
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===Raspberry Pi shuts down soon after booting up===
 
===Raspberry Pi shuts down soon after booting up===
This is caused by a power supply with too low voltage or too high voltage.
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This is caused by a power supply with too low voltage or too high voltage.  
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Or it could be the cable. See: [[On_the_RPi_usb_power_cable]]
  
 
==Keyboard / Mouse / Input Devices==
 
==Keyboard / Mouse / Input Devices==

Revision as of 05:47, 22 April 2012

Back to the Hub. This page lists the most common problems and suggests some solutions.

Power / Start-up

A good power supply that will supply 5V is vital. There is more information about power supplies and troubleshooting.

Red power LED does not light, nothing on display

The power is not properly connected.

Red power LED is on, green LED does not flash, nothing on display

The Raspberry Pi cannot find a valid image on the SD card. Check that you have correctly written a Raspberry Pi image to the card. See also, Known SD Cards.

Raspberry Pi shuts down soon after booting up

This is caused by a power supply with too low voltage or too high voltage. Or it could be the cable. See: On_the_RPi_usb_power_cable

Keyboard / Mouse / Input Devices

Keyboard randomly repeats key presses

This is caused by inadequate power. Use a good power supply and a good power cable. Some USB devices require a lot of power, most will have the voltage and mAh on the back of them, they should be 5v 100mA each max, any more than this they must be used with a powered USB hub. Try unplugging every USB device except the keyboard (you should also note that some keyboards have built in hubs and can try to draw 1500mA (Pi can only handle 100mA per USB slot without a hub)).

Memory Cards

General / Formatting

If you are having problems setting up your memory card you might want to try erasing it completely - especially if it has been used elsewhere and still contains data / partitions. Windows and Mac users can download a formatting tool from the SD Association: https://www.sdcard.org/downloads/formatter_3/

Networking

Ethernet connection is lost when a USB device is plugged in

This is caused by inadequate power. Use a good power supply and a good power cable. Some USB devices require a lot of power, so they must be used with a powered USB hub. Some cheap USB hubs suck power from the Raspberry Pi even if a USB power supply is connected.

Sound

Sound does not work

Device drivers for sound are still being developed. Please wait for the community to improve the situation.

Display

Video does not play or plays very slowly

Device drivers for video are still being developed. The XMBC distribution is the only distribution with good video support at the moment. Please wait for the community to improve the situation.

Can only get 800x480 resolution in LXDE (Arch linux)

Known issue with distro package as of 17-Apri-2012 - there's some missing boot config info. Creating a suitable cmdline.txt fixes it - type the following at the Raspberry Pi command line:

  sudo echo "dwc_otg.lpm_enable=0 console=ttyAMA0,115200 kgdboc=ttyAMA0,115200 root=/dev/mmcblk0p2 rootfstype=ext3 rootwait" >/boot/cmdline.txt

GPIO

To be added.

Troubleshooting power problems

If you think you have a problem with your power supply, it is a good idea to check the actual voltage on the Raspberry Pi circuit board. Two test points labelled TP1 and TP2 are provided on the circuit board to facilitate voltage measurements.

Use a multimeter which is set to the range 20 volts DC (or 20v =). You should see a voltage between 4.75 and 5.25 volts. Anything outside this range indicates that you have a problem with your power supply or your power cable.

RPI Test Points.JPG Voltmeter.JPG