XO Self Test/Display

From OLPC

Jump to: navigation, search

The display test of the XO laptop goes through several steps. Each step pauses for a short time while the display is switched between frozen and live several times, as a test of the display controller and display memory.

step screenshot note method
1 Horizontal colour bars. You should check that the colours are all present, and look normal and clear. .horizontal-bars16
2 Vertical colour bars. You should check that the colours are all present, and look normal and clear. .vertical-bars16
3 A diagonal gradient between green and red colours. The most likely to show display noise as a result of EMI components on an XO-4. gvsr
4 A diagonal gradient between green and blue. gvsb
5 A horizontal gradient; black on left, white on right. Look for non-linearities. hgradient
6 A vertical gradient; black on top, white on bottom. vgradient
7 A crosshatch, white lines on black background. Look for lines that are not straight. The test also dims the backlight in steps at this point. crosshatch
8 A series of filled rectangles are drawn in random positions with random colours. random-selftest

The method column above can be used to lock a test on screen; for example to show the gvsr test image;

ok select /display  gvsr  key page unselect

Press a key and the test will end.

Personal tools
  • Log in
  • Login with OpenID
About OLPC
About the laptop
About the tablet
Projects
OLPC wiki
Toolbox
In other languages