Question about Texas Instruments TI-73 Explorer Calculator

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We have about 40 TI-73 Explorer calculators that give a black screen when turned. The contrast (2nd)arrow up or arrow down does not respond. What can I do to get these instruments working properly? I also have another 10 that display a lot of "broken images" on the screen. 5 more just will not turn on. Any suggestions?

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Hi

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Jack

Posted on Mar 23, 2011

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