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63-65
2-4. Displays a red, green, and blue pattern for verifying the
color purity of the display and also the ability to independently control
each color.
6 6
stuck pixels.
6 7
6. Displays a 16-step gray scale for verifying that the A19
GSP board can produce 16 different amplitudes of color (in this case,
white.) The output comes from the RAM on the GSP board, it is then
split. The signal goes thru a video DAC and then to an external monitor
or thru some buffer amplifiers and then to the internal LCD display. If
the external display looks good but the internal display is bad then the
problem may be with the display or the cable connecting it to the GSP
board. This pattern is also very useful when using an oscilloscope for
troubleshooting. The staircase pattern it produces will quickly show
missing or stuck data bits.
6 8
7. Displays the following seven colors. Red, Yellow, Green,
Cyan, Blue, Magenta and White.
8. This pattern is intended for use with an external display.
69
The pattern displays a color rainbow pattern for showing the ability
of the A19 GSP board to display 15 colors plus white. The numbers
written below each bar indicate the tint number used to produce that
bar (0 & lOO=pure red, 33=pure green, 67=pure blue).
7 0
9. Displays the three primary colors Red, Green, and Blue at
four different intensity levels. You should see 16 color bands across
the screen. Starting at the left side of the display the pattern is; Black
four bands of Red (each band increasing in intensity) Black four bands
of Green (each band increasing in intensity) Black four bands of Blue
(each band increasing in intensity) Black If any one of the four bits for
each color is missing the display will not look as described.
5. Displays an all black screen. This is used to check for
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Table of Contents
Troubleshooting
