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TI-84+ SE Backlight
Instructions from TI-84+ SE Backlight
Now is a good time to cut your EL panel down to size. Lay the LCD on top of it and trace around it with a marker. I chose to have the leads going out the right side (facing the front of the screen). You can cut the EL panel with scissors. You might want...

TI-84+ SE Backlight
Instructions from TI-84+ SE Backlight
Now we need to get the metal plate off of the screen. This is the most dangerous part of the project. Get some rubbing acohol and pour it into the holes in the back of the plate. This will help dissolve the adhesive holding it to the screen. I let the...

TI-84+ SE Backlight
Instructions from TI-84+ SE Backlight
Take one of those extra pieces of EL panel from earlier and start sliding it between the aluminium plate and the screen. Any other thin piece of plastic will also work. DO NOT USE A KNIFE or any other metal object. Add rubbing alcohol as you go to help...

TI-84+ SE Backlight
Instructions from TI-84+ SE Backlight
Now is a good time to test your LCD and make sure it still works. Load the batteries back into the back half of the case. Press the motherboard against the back half of the case so the battery connectors make contact. Use a screwdriver or some other...

TI-84+ SE Backlight
Instructions from TI-84+ SE Backlight
On the back of the LCD there is a reflector and a polarizer. This diagram shows the different layers.The reflector is a thin foil sheet on back of the polarizer. It needs to be removed so the backlight can shine through. The polarizer is a thicker plastic...

TI-84+ SE Backlight
Instructions from TI-84+ SE Backlight
Take the new polarizer film and slide it behind the LCD. If you turn the polarizer one way, the screen will be transparrent. If you turn it the other way, the screen will be opaque. Behold the magic of polarized light!Now you have the option of inverting...

TI-84+ SE Backlight
Instructions from TI-84+ SE Backlight
Assemble your LCD sandwich with the EL panel on the back, then the polarizer, then the glass. You can use some scotch tape around the edge to hold everything in place. I used some putty to stick the whole thing to the PCB, but you could also use some...

TI-84+ SE Backlight
Instructions from TI-84+ SE Backlight
Find a good place to mount the push button that will control the backlight. I chose to put mine on the left side of the calculator, as you can see in the pictures. This was a very tight fit though. Some other suggestions would be on the top or under...

TI-84+ SE Backlight
Instructions from TI-84+ SE Backlight
Carefully bend the EL panel leads so they fold around the back of the PCB. The panel can bend pretty far, just don't crease it.Now install the board back in the front half of the case and screw it down. The EL panel leads will stick up through gap between...

TI-84+ SE Backlight
Instructions from TI-84+ SE Backlight
Drill the hole for your button with a 9/64" drill bit. It may help to put the two halves of the case back together without the guts inside.

TI-84+ SE Backlight
Instructions from TI-84+ SE Backlight
Use hot glue to mount the inverter and push button in the back half of the case. Fortunately theres lots of space inside the TI. Use lots of glue so the button stays in place when you push it.

TI-84+ SE Backlight
Instructions from TI-84+ SE Backlight
Solder the - wire from the inverter to the - lead on the battery case. The inverter needs 3V, not 6V, so solder the + wire to the connector going between the second and third AA.

TI-84+ SE Backlight
Instructions from TI-84+ SE Backlight
Finally you can put the two halves back together. Plug in the EL panel and arrange all the wires so they don't get pinched. Snap the two halves of the case together.Before you screw everything together, put the batteries in and make sure it all works....

TI-84+ SE Backlight
Instructions from TI-84+ SE Backlight
Now its time to take apart the inverter. Clip off the spring and solder some wires onto the battery contacts. The inverter will be powered by two of the calculator's AAs.The inverter has two buttons, but they both do the same thing. Desolder the button...

TI-84+ SE Backlight
Instructions from TI-84+ SE Backlight
Celebrate.

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