Hatteland Display 26 inch - HD 26T21 STD (Widescreen) - Manual (Page 57)

57 User Controls
OSD Menu Functions
IND100064-42
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Service - Test Pattern
Will show the internal test pattern with shading color boxes for Red, Green, Blue and Black/White
(Grayscale) to check for deviations in the TFT panel/display controller behaviour. It is independent
of any current resolution or specifications found in the signal inputs. The test pattern is generated
internally in the display controller and is sent 1:1 directly to the TFT panel. It can be useful during
trouble-shooting situations to determine the source of a display or connectivity problem regarding
external equipment.
To active this function simply touch the “MENU” button.
● Note: This function will not inform/report any deviations directly, you need to have the required technical
expertise to interpret the test pattern displayed.