Specifications

F2 158004.B00
The TFTIF31 and TFTIF41 boards also feature a connector with the CS5530A
backlight enable signal (ENABKL) on it. This signal can be sent to the backlight
inverter, and used to power off the backlight when instructed to do so by the graphics
controller logic.
The TFTIF31 and TFTIF41 include solder links that can invert the image left to right,
and top to bottom. These links used together can be used to tip the picture upside
down, which can be useful to improve the viewing angle on the displays. Note that
this is a feature of some Sharp displays; other LCDs use the same pins for other
functions, and so users should check the pin assignments of their LCDs carefully and
consult DSP Design if in doubt.
F.2 INSTALLATION
Ensure that the TP400 VGA BIOS is configured in the BIOS Setup program to
support both the CRT and a TFT LCD of the desired resolution.
Check the solder links on the TFTIFxx board against the instructions in section F.4,
F.5, F.6, F.7 or F.8.
Plug the TFTIFxx board onto the LCD.
Then plug the 40-way ribbon cable assembly onto the TFTIFxx, aligning the red pin 1
marker with the pin 1 marker on the TFTIFxx connector.
Now connect the other end of the ribbon cable to connector J8 on the TP400, again
checking that pin 1 on the cable mates with pin 1 on the TP400.
Connect a backlight inverter to the TFT LCD. Take care with the backlight inverter as
it produces a very high voltage (several hundred volts). You may wish to connect the
enable pin on the backlight inverter to the ENABKL pin on the TFTIF31 orTFTIF41
boards.
Switch on the TP400. You should see clear, crisp video on the LCD panel.
F.3 CABLE LENGTHS
The TFTIFxx boards are supplied without the 40-way ribbon cable. This must be
ordered separately.
Users should select a cable that is as short as practical for their application.
The TFTIF-CAB11 cable is approximately 11 inches in length. This is a compromise
between reducing electrical noise on the signals (which improves as the cable length
decreases) and increasing convenience (which might suggest a longer cable length).
DSP Design does not recommend longer cable lengths, but customers may find they
are able to increase the cable length in practice.
Customers may order their own cables from the manufacturer, Samtec, who can
make cables to any length. The Samtec part number for the 11 inch cable is FFSD-
20-D-11-01-N