Chapter 10 10-15
Service Key Menus and Error Messages
Service Key Menus
77 Test Pat 12 Displays a repeating gray scale for troubleshooting, using an oscilloscope. It is
similar to the 16 step gray scale but is repeated 32 times across the screen.
Each of the 3 outputs of the video palette will then show 32 ramps (instead of
one staircase) between each horizontal sync pulse. This pattern is used to
troubleshoot the pixel processing circuit of the A19 GSP board.
78 Test Pat 13 Displays a convergence pattern for measuring the accuracy of the color
convergence of the external monitor.
79–80 Test Pat
14–15
Displays crosshatch and inverse crosshatch patterns for testing color
convergence, linearization alignment. This is useful when aligning the LCD
display in the bezel.
Table 10-10 Test-Patterns
Test
Number
Test Name Description
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