Chapter 4: Problem Isolation Procedures 4-3
Fault Conditions/Solutions
Condition: Touch Screen not accurate
1. The Touch Screen may not be calibrated properly. Recalibrate Touch Screen using the
Hampshire Touch Controller calibration procedure. Follow instructions in the Touch
Screen Calibration section.
2. Replace the touch sensor and then perform the Calibration procedure.
3. Replace the main Controller Board and then perform the Calibration procedure.
Condition: No display
1. Check that the LCD backlights are functioning properly. You should be able to see light
coming from the back edges of the LCD panel. If the backlights DO NOT appear to be
functioning either the cable harness between the main Controller Board and the backlight
inverter may be loose or damaged, one or both backlights in the LCD panel may have failed
or be disconnected, or the backlight inverter board may have failed. Check/reseat the cable
harness. If the unit is still not functioning replace the LCD & recalibrate the Touch Screen. If
the problem remains, re-install the original LCD and replace the backlight inverter board.
2. Check that a cable is attached to the Powered USB port on the 5965 display and/or that the
unit is operating from a power brick connected to the DC powered connector (depending
upon the display’s configuration). Ensure that this/these cable(s) are properly connected to
the terminal, and that the display is turned on. Check that the VGA or DVI video cable is
properly connected to both the 5965 and the terminal. Check each end of the cable to
ensure that no pins have been bent. (If another 5965 display is available you can quickly
isolate the problem to either the display or terminal by temporarily replacing the 5965 with
another.)
3. Check that the terminal or application is not in a standby, or suspend mode. The front
panel LED should be illuminated Amber if in one of these modes. If the system is found to
be in one of these modes, return the system to normal operating mode as required by the
application. In the normal operating mode the front panel LED should be illuminated
Green.
4. Enter the On Screen Display (OSD) menu and check that the Brightness, Contrast, or
Frequency controls are not misadjusted. Perform Factory Reset or Autoadjust from the
OSD if necessary.
5. If, at this point, the unit is still not functioning correctly it may be necessary to open the
unit for service. Visually inspect the front of the LCD panel for any obvious damage.
Replace the LCD panel if damaged & recalibrate the Touch Screen.
6. If the LCD backlight is functioning correctly, check that the internal cable harness between
the LCD panel and the main Controller Board is properly connected at both ends. Re-seat
these connectors if necessary.
7. If the problem persists, replace the main Controller Board and then perform the
Calibration procedure.
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