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Dell offers two LCDs with the Latitude™ D620:
14.1" WXGA nonglare (1280x800)
14.1" WXGA+ UltraSharp™ (1440x900)
Both LCDs are 14.1" wide-screen displays with a 16:10 aspect ratio. These LCDs are not CRUs.
LCD Built-In Self-Test
The Preboot System Assessment (PSA) build 3019 introduces a new test for the LCD, the LCD BIST (Built-In Self-
Test). The LCD BIST
is only available if the platform supports it.
Here are the steps to follow to run the LCD BIST:
1. Boot to the Preboot System Assessments (PSAs).
2. Watch the screen and listen for the color bar test prompt tones emitted by the PSA Diagnostics.
3. Press N or wait approximately 30 seconds to fail the color bar test.
4.
Watch for the LCD BIST color generation and listen for the beeps every 2 seconds that indicate LCD BIST is running.
5. LCD BIST runs for approximately 20 seconds then stops. The 3-3-3 or 3-3-
4 error code is then displayed on the BIST's
completion.
While running this test, the LCD is operating on its own, free of the video controller which may be discrete (a video card) or onboard (on
the system board). The test allows you to distinguish an LCD panel problem from a problem with the controller. If the colors are
displayed across the screen without a problem, then the issue is not with the LCD.
LCD
NOTE:
If the screen is visible, the PSA Diagnostics draws a series of multicolored bars across the screen. Once complete,
a prompt asking if you saw the pattern appears and is accompanied by a brief series of tones.
Printed 2/22/2010 11:17:19 AM
Latitude™ D620
For Dell Employees Only
Expires 2/23/2010 11:17:19 AM
LCD
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22/02/2010
https://dcse.dell.com/SelfStudy/Foundations_2007/Foundations_2007_Portables/Portable
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