Appendix basic trouble-shooting – Hatteland Display 20 inch - HM 20T07 CMD User Manual

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IND100077-8

Appendix

Basic Trouble-shooting

COMMON ERRORS: (This is a generic description of possible issues for a varity of products)

If for some reason there should be something wrong with the picture quality or no picture present, check the

symptoms carefully and try to cure it with the hints below:

NO PICTURE / LED BEHAVIOUR:

If there is no light at all in the LED at the FRONT, check power cables. If the LED in front is green then

check if the brightness knob is turned to the right (max brightness). If still no picture, check if there is a VGA

signal on the External VGA connector. If you have a picture on the external VGA connector please look in

BIOS documentation/chapter for correct display settings in BIOS. Lack of image is most likely to be caused

by incorrect connection, lack of power, or wrong BIOS settings.

SCROLLING / UNSTABLE IMAGE:

Signal cable may not be completely connected to computer or TFT display. Check the pin assignments and

signal timings of the display and your video card with respect to recommended timing and pin assignments.

Make sure that the video card is compatible and that it is properly seated / installed on the computer.

DISPLAY AREA IS NOT CENTERED / SIZED CORRECTLY

Make sure that a supported video mode has been selected on the display, or on the video card / system. If

it is impossible to position the image correctly, i.e. the image adjustment controls will not move the image

far enough, then test it again using another graphics card for the PC system. This situation may occur with

a custom graphics card that is not close to standard timings or if something is in the graphics line that may

be affecting the signal, such as a signal splitter (please note that normally a signal splitter will not have any

adverse effect). If it is impossible to change to the correct resolution/color depth, check if you have the right

VGA driver installed in your system.

IMAGE APPEARANCE:

A faulty TFT panel can have black lines, pixel errors, failed sections, flickering or flashing image.

Incorrect graphics card refresh rate, resolution or interlaced mode will probably cause the image to be the

wrong size, it may scroll, flicker badly or possibly even no image is present. Sparkling on the display may

be a faulty TFT panel signal cable, and it needs service attention.

RGB Signal Only:

Horizontal interference can usually be corrected by adjusting the PHASE (OSD menu).

Vertical interference can usually be corrected by adjusting the FREQUENCY (OSD menu).

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