XO Troubleshooting AV: Difference between revisions

From OLPC
Jump to navigation Jump to search
No edit summary
No edit summary
Line 2: Line 2:


==Open Firmware Tests==
==Open Firmware Tests==
A stereo sweep pattern is output for testing the speakers/headset jack when running the [[Open Firmware]] [[XO_Self_Test|hardware self-tests]]. A microphone test, where audio is recorded, then played back (at low volume) is also included. These are activated by holding down the left side of the rocker switch (on the left side of the screen) when the laptop is powered on.
A stereo sweep pattern is output for testing the speakers/headset jack when running the [[Open Firmware]] [[XO_Self_Test|hardware self-tests]]. A camera test, and a microphone test (where audio is recorded, then played back at low volume) is also included. These are activated by holding down the left side of the rocker switch (on the left side of the screen) when the laptop is powered on.


==Testing from Sugar==
==Testing from Sugar==
Line 8: Line 8:


You can increase the output volume of Tam Tam Mini using the rightmost of the four sliders in the upper left corner.
You can increase the output volume of Tam Tam Mini using the rightmost of the four sliders in the upper left corner.

'''Ensure that the laptop output volume is turned up using the "volume adjust" keys'''
'''Ensure that the laptop output volume is turned up using the "volume adjust" keys'''

The "Record" activity is useful for testing the function of the microphone and camera. The "Analyze" activity may also be used to debug microphone problems.


==No sound through one of the speakers==
==No sound through one of the speakers==
If no sound is heard through one of the speakers
If no sound is heard through one of the speakers, try using the headphone jack. If one of the audio channels is silent through the headphones, the motherboard probably needs replacing.


[[Secure_Update|Reinstall the software]] and repeat the tests to ensure that the problem is in hardware before replacing the motherboard.

If both channels are heard through the headphones, [[Disassembly_top|disassemble the top portion of the laptop]] and replace the speaker. If this doesn't fix the problem, replace the motherboard.

:Suspect components in this case are static protection U67/U68, and the power amplifier, U44. Note that the laptop uses a class D amplifier, making it difficult to directly measure the output.''


==No sound through either speaker==
==No sound through either speaker==
If no sound is heard through either speaker, try using the headphone jack.
If no sound is heard through either speaker, try using the headphone jack. If the headphones work fine, then [[Disassembly_top|disassemble the top of the laptop]] and try replacing the speakers.


If replacing the speakers doesn't fix the problem, replace the motherboard.
If no sound is heard through the headphone jack,

:Suspect components in this case are the power amplifier, U44, the headphone jack, and the +5V supply. Note that the laptop uses a class D amplifier, making it difficult to directly measure the output. Inserting headphone should toggle the signal on pin 2 of Q42. If that signal doesn't toggle, try replacing the headphone jack (CN3). Check the operation of the USB ports. If they work, then the +5V supply is working. If USB ports are also non-functional (no +5V), check U26, D126, and L28.

===Speakers and Headphones don't work===
If no sound is heard through either the headphone jack or the speakers, the motherboard probably needs replacing.

[[Secure_Update|Reinstall the software]] and repeat the tests to ensure that the problem is in hardware before replacing the motherboard.


==Garbled sound or rattling from a speaker==
==Garbled sound or rattling from a speaker==
When a (loud) sound is played, one (or both) speakers rattle or garble the sound.
When a (loud) sound is played, one (or both) speakers rattle or garble the sound.


Use the headphone jack to verify that the sound isn't garbled through the headphones. If it is, try [[Secure_Update|Reinstall the software]] and repeat the tests. If the problem persists, replace the motherboard.
Use the headphone jack to verify that the


If the audio sounds fine through the headphones, [[Disassembly_top|disassemble the top of the laptop]] to access the garbled/rattling speaker. If the speaker is loose in it's mount, try pressing it back. If this repairs the problem,
In some cases, this is dues
use hot glue or contact cement to ensure that it doesn't come loose again. If the speaker continues to sound bad, replace it.


==No sound through the headphones==
==No sound through one or both headphone channels==
If the speakers function correctly, yet no sound is heard through one or both headphone channels, the headphone connector on the motherboard needs replacement.

If the speakers function correctly, this is caused by the headphone connector.


==The microphone doesn't work==
==The microphone doesn't work==
If the built-in microphone doesn't work, try using an external microphone.

If an external microphone doesn't work either, see


==The microphone jack doesn't work==
==The microphone jack doesn't work==
Line 37: Line 53:


==Images from the camera are black==
==Images from the camera are black==
If there are error when trying to use the camera, or the image obtained from the camera is black, [[Disassembly_top|disassemble the top of the laptop]] and take a look at the camera connector (on the back of the motherboard, underneath the camera). The latch on this connector occasionally opens. Reseat the cable and latch the connector (this requires removing the motherboard.) Repeat the tests.

If this doesn't fix the


[[Category:Repair]]
[[Category:Repair]]

Revision as of 16:47, 26 June 2008

This is the portion of the XO Troubleshooting Guide for diagnosing problems with the audio and camera components of an XO laptop.

Open Firmware Tests

A stereo sweep pattern is output for testing the speakers/headset jack when running the Open Firmware hardware self-tests. A camera test, and a microphone test (where audio is recorded, then played back at low volume) is also included. These are activated by holding down the left side of the rocker switch (on the left side of the screen) when the laptop is powered on.

Testing from Sugar

The "Tam Tam Mini" activity is a good source of audio for testing. The default sound source (guitar) is OK. Press the one of the "QWERTYUI" keys to obtain a sound. It generates a sound in both stereo channels.

You can increase the output volume of Tam Tam Mini using the rightmost of the four sliders in the upper left corner. Ensure that the laptop output volume is turned up using the "volume adjust" keys

The "Record" activity is useful for testing the function of the microphone and camera. The "Analyze" activity may also be used to debug microphone problems.

No sound through one of the speakers

If no sound is heard through one of the speakers, try using the headphone jack. If one of the audio channels is silent through the headphones, the motherboard probably needs replacing.

Reinstall the software and repeat the tests to ensure that the problem is in hardware before replacing the motherboard.

If both channels are heard through the headphones, disassemble the top portion of the laptop and replace the speaker. If this doesn't fix the problem, replace the motherboard.

Suspect components in this case are static protection U67/U68, and the power amplifier, U44. Note that the laptop uses a class D amplifier, making it difficult to directly measure the output.

No sound through either speaker

If no sound is heard through either speaker, try using the headphone jack. If the headphones work fine, then disassemble the top of the laptop and try replacing the speakers.

If replacing the speakers doesn't fix the problem, replace the motherboard.

Suspect components in this case are the power amplifier, U44, the headphone jack, and the +5V supply. Note that the laptop uses a class D amplifier, making it difficult to directly measure the output. Inserting headphone should toggle the signal on pin 2 of Q42. If that signal doesn't toggle, try replacing the headphone jack (CN3). Check the operation of the USB ports. If they work, then the +5V supply is working. If USB ports are also non-functional (no +5V), check U26, D126, and L28.

Speakers and Headphones don't work

If no sound is heard through either the headphone jack or the speakers, the motherboard probably needs replacing.

Reinstall the software and repeat the tests to ensure that the problem is in hardware before replacing the motherboard.

Garbled sound or rattling from a speaker

When a (loud) sound is played, one (or both) speakers rattle or garble the sound.

Use the headphone jack to verify that the sound isn't garbled through the headphones. If it is, try Reinstall the software and repeat the tests. If the problem persists, replace the motherboard.

If the audio sounds fine through the headphones, disassemble the top of the laptop to access the garbled/rattling speaker. If the speaker is loose in it's mount, try pressing it back. If this repairs the problem, use hot glue or contact cement to ensure that it doesn't come loose again. If the speaker continues to sound bad, replace it.

No sound through one or both headphone channels

If the speakers function correctly, yet no sound is heard through one or both headphone channels, the headphone connector on the motherboard needs replacement.

The microphone doesn't work

If the built-in microphone doesn't work, try using an external microphone.

If an external microphone doesn't work either, see

The microphone jack doesn't work

Images from the camera are black

If there are error when trying to use the camera, or the image obtained from the camera is black, disassemble the top of the laptop and take a look at the camera connector (on the back of the motherboard, underneath the camera). The latch on this connector occasionally opens. Reseat the cable and latch the connector (this requires removing the motherboard.) Repeat the tests.

If this doesn't fix the