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Old Fx-7000g And Display Problem


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#1 dafi

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Posted 18 July 2009 - 08:19 AM

I'm a proud owner of (old) fx-7000g calculator but after years of happy work the display starting to have problems.

Starting from the center of the screen some pixel started to became dark and now this phenomenon is expanded to whole display?

Do you know how can I change the display or fix the problem?

I know this is a very old model but it works fine so why I must trash it if I can try to fix it?

TIA

Edited by dafi, 18 July 2009 - 08:19 AM.


#2 JimC

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Posted 18 July 2009 - 04:17 PM

We must be some of the few people out there who still hold on to the fx-7000g ! I bought mine years and years ago, my first graphing calculator - and if I remember correctly - the fx-7000g was THE FIRST graphing calculator ever made.

I've found that there can be problems with the display when the batteries run low so be sure the batteries are fresh. Also, pull the batteries out and put them back in (reboot).

Next, adjust contrast. You have to tap 'Mode' button and then tap either the left or right arrow buttons repeatedly to adjust the contrast. Other than these I've had no display problems. But...

At about the same time I bought the fx-7000g I also had another Casio programmable (non-graphing) that developed a problem with the display. The symptoms were dimmed or darkened lines of pixels across the display that could be affected by flexing the calculator or banging it into the palm of your hand. I took that unit apart and found that there was a rubber strip with conductors imbedded into it. This strip interfaced the display signals from the board to the display. It seems I may have dropped the calculator onboard ship (back in my Navy days) and this strip became misaligned. After some fiddling I was able to get this strip aligned again. Pressure alone holds it in place. You can also clean it with a soft damp cloth if there appears to be any contaminants in the area where the strip is located.

I've also heard of LCD screens left in the hot sun developing similar symptoms but the effect is usually temporary, with the display returning to normal after the screen cools off. If permanent, despite trying the above, then there may be a power problem in the display driver circuitry, something that is NOT able to be repaired by us mere mortals!

JT


I'm a proud owner of (old) fx-7000g calculator but after years of happy work the display starting to have problems.

Starting from the center of the screen some pixel started to became dark and now this phenomenon is expanded to whole display?

Do you know how can I change the display or fix the problem?

I know this is a very old model but it works fine so why I must trash it if I can try to fix it?

TIA



#3 dafi

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Posted 18 July 2009 - 04:27 PM

We must be some of the few people out there who still hold on to the fx-7000g ! I bought mine years and years ago, my first graphing calculator - and if I remember correctly - the fx-7000g was THE FIRST graphing calculator ever made.

I love it and works very fine for me

I've found that there can be problems with the display when the batteries run low so be sure the batteries are fresh. Also, pull the batteries out and put them back in (reboot).

Next, adjust contrast. You have to tap 'Mode' button and then tap either the left or right arrow buttons repeatedly to adjust the contrast. Other than these I've had no display problems. But...

At about the same time I bought the fx-7000g I also had another Casio programmable (non-graphing) that developed a problem with the display. The symptoms were dimmed or darkened lines of pixels across the display that could be affected by flexing the calculator or banging it into the palm of your hand. I took that unit apart and found that there was a rubber strip with conductors imbedded into it. This strip interfaced the display signals from the board to the display. It seems I may have dropped the calculator onboard ship (back in my Navy days) and this strip became misaligned. After some fiddling I was able to get this strip aligned again. Pressure alone holds it in place. You can also clean it with a soft damp cloth if there appears to be any contaminants in the area where the strip is located.

I've also heard of LCD screens left in the hot sun developing similar symptoms but the effect is usually temporary, with the display returning to normal after the screen cools off. If permanent, despite trying the above, then there may be a power problem in the display driver circuitry, something that is NOT able to be repaired by us mere mortals!


The problem is like something is flooding the display, like pixels are damaged and become an "hole", I never left the 7000g under sun and battery are new.

Maybe I must prepare myself to say goodbye to my fx-7000g :(

thanks for your reply :)

#4 JimC

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Posted 18 July 2009 - 06:26 PM

Like a puddle of black ink under the display? I see what you mean now. Your pixels are physically damaged then. I wouldn't think there's any fix for that besides a new display.

I'd consider then an FX-9860GII which, if it were available in a slim model, I would already have even though the slim is US $20 more than the standard form.

JT

I love it and works very fine for me



The problem is like something is flooding the display, like pixels are damaged and become an "hole", I never left the 7000g under sun and battery are new.

Maybe I must prepare myself to say goodbye to my fx-7000g :(

thanks for your reply :)



#5 JimC

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Posted 18 July 2009 - 09:59 PM

Come to think of it, I have the fx-7400g plus that I don't use at all, if you're interested. I bought that before I got the TI Voyage 200 and the HP50g. Now the 7400 just sets in the drawer since I use the TI or the HP for most graphing purposes.

I love it and works very fine for me



The problem is like something is flooding the display, like pixels are damaged and become an "hole", I never left the 7000g under sun and battery are new.

Maybe I must prepare myself to say goodbye to my fx-7000g :(

thanks for your reply :)



#6 dafi

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Posted 19 July 2009 - 05:51 AM

Like a puddle of black ink under the display? I see what you mean now. Your pixels are physically damaged then. I wouldn't think there's any fix for that besides a new display.

Exactly, you description it perfect, like ink under the display.
I've googled to find a display but without success, considering also the cost maybe buying a new calculator is easier.

#7 rubeon

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Posted 21 September 2021 - 10:26 PM

Searching around in THE FUTURE (2021) I came across this old forum post.

 

I turned my FX-7000g on today for the first time in about 2 years, and there was the big black squircle of doom.  I though it would be around forever!  It's been amazingly reliable over the years and always filled me with joy when I decided to use it to solve some math thing I was having trouble doing mentally.

 

For people looking for an explanation: It looks like the bottom reflective layer of the LCD degrades over time and forms a big black squarish area that is hard to see through. It's basically ruined, and unless you repair LCD matrix displays for a living you are probably going to have to replace it.

 

FX-7000g's aren't terribly expensive to buy nowadays, but I've had mine since 1988 and want to keep it.  

 

This guy on YouTube did a helpful video of a screen swap, and it looks pretty doable:

 

 

I have moderate soldering skills, so I will try to get a replacement screen and save my little buddy.

 

 






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