Question about Texas Instruments Voyage 200 Calculator

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Blank vertical lines are appearing on the screen.

My texas instruments voyage 200 was perfect the year i used..
then suddently i saw 2 vertical blank lines appearing on my screen..
after one more year, i have around 30 blank lines that are hiding what i write on it.

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Re: Blank vertical lines are appearing on the screen.

Hi, and sorry for my english !
Maybe the LCD driver voltage is wrong or noisy. I had the same problem: some vertical lines (not constant), pulsing contrast after powerup, pixel crosstalk, sometimes no screen

Solution: Try to replace the LCD power negative voltage buffer capacitor.
In my hardware version it is in the middle of the two T6B07 column driver IC (U3&U4) on the right side. Colored black, electrolytic type and the Value is : 10uF/25V. Chage it to around the same type.
There is enought space, so you can use a small sized non smd type capacitor. Be care of the polarity.

I hope it will help... ;)

Greetings from Hungary!

Posted on Mar 23, 2009

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Re: Blank vertical lines are appearing on the screen.

I can't be sure... but that problem seems to be very common to this calculator; and I doubt that a capacitor would go bad on all the calculators.

There was a built-in obsolescence to these calculators because they were using rubber impregnated with carbon to connect the barely discernible pads on the glass to the circuit board. I can't prove, yet, that this is the problem - because I don't yet have one... but I suspect that that is what is happening. The rubber dries out, and as the rubber dries out the contact with the screen goes away.

I would guess that every calculator of this type will eventually be that way. Look at E-Bay and you will see that they are selling them at lots of 5 for $99, all with that problem. And, the ones which don't have the problem are going for $200.

Well, I wouldn't expect that to last long. The $200 will probably have missing lines in a few years, too.

I don't think any capacitor is the problem. Capacitors don't all go bad at once on every calculator ever manufactured.

Posted on Mar 27, 2015

Re: Blank vertical lines are appearing on the screen.

**** it

Posted on Mar 25, 2008

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