XO Troubleshooting Guide
This is a troubleshooting guide for the XO laptop. It is for troubleshooting production XO laptops running firmware version Q2D03 or greater. While this is intended for use in a repair center, most of the procedures can be followed by users to repair their laptops.
If you are having problems with the display on an XO laptop, see the Display diagnostics section.
Power and Battery problems
If you are having problems such as:
- the battery is not charging
- the battery is suddenly losing charge
- the laptop won't run from a power adapter
Then you should view:
- XO Troubleshooting Battery, if you believe the problem is contained within the battery itself, or
- XO Troubleshooting Power, if you believe the problem is contained within the laptop (e.g. charging circuitry, power input circuitry), or
- Both of the above, if you are unsure where the problem is localised.
If your laptop is having trouble connecting to other laptops or the Internet, see the Network diagnostics section.
If you are having problems with the keyboard or touchpad on an XO laptop, see the Keyboard diagnostics section.
If you are having problems with the USB interfaces on an XO laptop, see the USB diagnostics section.
The following are common debugging and test procedures:
- Rebooting the Embedded Controller - This completely resets a laptop
- A Hardware Self-Test is included in the XO laptop.
- Boot options - Different boot options are available through pressing buttons around the screen during the initial boot process (immediately after pressing the power button). A sampling (more at Cheat codes):
- '✓' (check) game pad key: forces a more detailed display while booting. See Troubleshooting Power-On for more details. This is useful for debugging activation problems.
- 'O' game pad key: alternate between the current boot image and a previous one. In laptops which have never been upgraded, there is no previous boot image to use.
- Rocker left: invoke hardware self-test.
- A serial adapter is very useful for debugging dead laptops
The following are common repair procedures:
- Motherboard Handling Procedures
- Disassembly Guide
- Motherboard Guides: intro, or repair
- Getting a developer key for a laptop
- Turning an XO into a serial terminal
- Finding and fixing bad blocks of NAND Flash
- Replacing/Recovering the EC (SPI) Flash - Replacing the Embedded Controller Flash
- Fixing an RTC problem - Fix laptops which can't boot due to reset RTC time.
- Fixing LiFePO4 batteries that stop charging
- A detailed description of the laptop power circuitry (XO-1)
- Memory Bit Mapping