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Connect a 240x128 LCD to a LPT-port: This tutorial explains how to connect a DataVision graphic LCD display to your LPT port by using a LPT-cable and some soldering skills.

Date: May 16, 2003
Mod Site:
Written By:

The Soldering


First of all, I will melt some solder over the 20 pins of the LCD display, in order to prepare these pins for the soldering of the wires. When some solder is applied to the pins previous to soldering the wires, the latter ones will connect more easy.

Please note that you only have to apply a small amount of solder to the pins, too much is NOT good.

After the applying of the solder to the pins, it’s time to connect the wires. To prevent any possible short-circuit I’ve used about a ½" of shrink tubing around each wire. This shrink tubing has slide around the cable before you connect it.

When all the wires are connected according to the wiring diagram, I slide the shrink tubing around the connection points and with a hair dry blower (or paint stripper) I’ll shrink them firm on their spot.

The Back Light Control, Contrast Control, and the Reset Button

As you can see on the wiring diagram on the previous page, it is also possible to control the back light and the contrast, and there is a reset button.

These three controller units can be easily built on a small PCB, connected through some wires, in order to place this control unit somewhere else in your computercase.

I’ve made for this purpose a small PCB, using the two potentiometers, three resistors and the condensator and the reset button.

When you are ready with soldering, and every wire is connected,it will look like this:

Final Words

After all the hard labour, it is now time to connect the graphic LCD display to the LPT port of the computer.

Don't forget that the supply voltage of these kinds of LCD displays is only 5 (five!!) volts, so please connect them to the RED and the BLACK wire of your PC power supply molex.

Should it be connected to 12Volts (yellow & black from PSU), your screen will DIE instantly!!

The program , written by MaNDaRK and Mr.ChronoM, is a very good program, since it has been written especially for this kind of graphical LCD display.

When you decide to install PowerLCD, please take good note to the instructions of the programmers, since for Windows ’98 and higher Operation Systems you’ll need for example the extra program , in order to get direct hardware access to the LPT port.

But when all the required programs are installed, you really can enjoy the Graphic LCD display.

Ed. Note: If you have any other questions, feel free to checkout , or contact .

If you have any comments, be sure to hit us up in our forums.

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