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This is an archived, read-only copy of the United-TI subforum , including posts and topic from May 2003 to April 2012. If you would like to discuss any of the topics in this forum, you can visit Cemetech's Calculator Hardware subforum. Some of these topics may also be directly-linked to active Cemetech topics. If you are a Cemetech member with a linked United-TI account, you can link United-TI topics here with your current Cemetech topics.

This forum is locked: you cannot post, reply to, or edit topics. Calculator Modifications => Calculator Hardware
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Spartacus5


Newbie


Joined: 19 Nov 2006
Posts: 1

Posted: 19 Nov 2006 10:36:39 pm    Post subject:

Ok, so im a total newb at taking stuff apart, but i do have some school experience with PCB's so im not totally confused here, but it would be nice to have a backlight on my 84+SE. How would i go about doing that. In simple terms, so i dont screw it up. I cant afford to buy another one. Smile
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c_plus_plus
My Face Hertz


Active Member


Joined: 30 Jan 2006
Posts: 575

Posted: 21 Nov 2006 02:32:16 pm    Post subject:

Take it from me: DON'T TOUCH THE INERDS OF AN 84+SE! I tried to back light mine and later the screen became messed up. I am now stuck with a half-working calc that I can't return.
I would recommend this project only if you have an extra lower-end calc to try it on.
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hydravien


Newbie


Joined: 06 Apr 2008
Posts: 5

Posted: 06 Apr 2008 08:18:58 pm    Post subject:

Backlighting a ti 84+ i will say is very hard if not impossible.

My way around this however is a frontlight.

Frontlights work by directing light from a source down into the lcd, where it is reflected back up by the lcd mirror and out to you. You dont have to remove the lcd from the metal plate or separate the reflectore from the lcd, which makes it much safer.

That being said i still managed to almost screw it up... Using my infinite wisdom i hot glued part of the wiring to the back of the pcb for some strain relief. but in assembling the calc it fell off my desk, and just barely clipped the lcd ribbon cable, so if you decide to do this i must recommend extreme caution.

anyhow, to accomplish this mod, i used small wire from inside a phone line. The frontlight is out of a broken gameboy advance sp. it fits the screen almost exactly on the ti84. you need to solder your own wires onto that. Then solder one of the wires to a small dip switch. The wires coming from that and the frontlight are tied into the calc's main batteries. I believe the battery in a gameboy is a small li ion or lipo which would make it 3.6-3.7v, so you only need to tie it into 3 of the calcs main batteries. 2 will not work, 4 will overpower it and it will burn out.

After your circuit is complete place the plate from the frontlight on top of the ti screen. Ensure that it is facing the right way or else it will direct light up at you and obliterate what the calc reads. Also you will need to remove the foam from the front of the calc where it holds the lcd in place. When reassembling it you will need to remove about half of the foam attached to the silver... thing? for lack of a better word.

To make a hole in the case i used an engraver i had handy from a previous feat. I built up a small mount out of hot glue and then mounted the switch firmly in place using rubber reinforced ca (superglue). after that, re assemble the calc and youre good to go.

Keep in mind this will kill the main batteries faster. I run rechargeables and i also dont intend on using it too often.. after all how often do you find yourself working in the dark.
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hydravien


Newbie


Joined: 06 Apr 2008
Posts: 5

Posted: 06 Apr 2008 08:22:07 pm    Post subject:

some more images

the really blurry one is an extended exposure... you cant read anythign on it but it just shows that the light is brighter than what the other pic shows.
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TheStorm


Calc Guru


Joined: 17 Apr 2007
Posts: 1233

Posted: 06 Apr 2008 09:50:26 pm    Post subject:

*cough*look at the post dates*cough*
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hydravien


Newbie


Joined: 06 Apr 2008
Posts: 5

Posted: 06 Apr 2008 11:24:30 pm    Post subject:

yea i realise that, but does backlighting ever go out of style?

and if the people involved here do not want to backlight their calc anymore then perhaps it can be of use to others who might stumble across it years in the future such as myself...
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iklln6


Newbie


Joined: 05 Oct 2009
Posts: 11

Posted: 05 Oct 2009 04:59:59 am    Post subject:

*applauds at date* i will post my pictures when / if i succeed Smile
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zenome


Newbie


Joined: 01 Oct 2010
Posts: 7

Posted: 01 Oct 2010 03:34:07 am    Post subject:

iklln6 wrote:

*applauds at date* i will post my pictures when / if i succeed Smile


http://www.youtube.com/watch?v=JmxTIeyWelg

Check this video out. I sold this on Ebay. I can install backlights around 30-45 minutes. (Professionally installed and looks clean, close to factory with a nice small microswitch next to the ON button). The LEDs installed on my calculator uses 20mA or a total of 80mA, reduced to 65mA (through resistor). The result is a calculator that will die before the light dies out. Or about 200 hours of use.


Last edited by Guest on 01 Oct 2010 03:49:06 am; edited 1 time in total
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xchris


Newbie


Joined: 02 Aug 2011
Posts: 1

Posted: 04 Aug 2011 04:55:57 pm    Post subject:

I know a guy that managed to 'transplant' a backlight from a PSION Workpad (the device was dead) to a Ti83... unfortunately the result was a bit 'freaky'... the backlight was not very good...
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