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Appendix D - Troubleshooting
D.1
Touch unreliable or non-operative
If the touch screen is unreliable or non-operative, do the following:
1.
Make sure the metal shell of the display is connected to one of the SLCD+
mounting holes. This is the same as saying that the display case should be
grounded to SLCD+ ground. Note that this only applies to displays with CCFL
backlights not to EL or LED backlights.
2.
Run the TOUCH CALIBRATE command, "tc". This will reset the calibration
values and allow you to recalibrate the touch screen.
If after doing this the touch is still non-operative, check the touch connection into the
SLCD+ board. Some touch panels use conductive ink that can be easily scraped off by
too many or incorrect connector insertion cycles. If there are holes you can see through
on the touch connector end where it plugs into the SLCD+ connector this is the problem.
To determine the accuracy and sensitivity of the touch, you can use the "debug"
command as follows:
*debug 1<return>
This puts an "X" on the screen whenever a valid touch is recognized. To turn off, use:
*debug 0<return>
D.2
Color STN (passive) display looks too dark, text is blue instead of
black
If the display does not look correct, it may be that the contrast has been set too far high or
low. Use the "C=" command to set the contrast adjust at mid-point and the use the "C+"
and "C-" commands to adjust the contrast for best color.
SLCD+ Controller Manual V1.1
8/14/2009
Page 28
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