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You need to visit the TI site for graphing calculators, They have the whole book available for free download by chapters. (I have an 82 Plus myself and printed the whole graphing book out... it usually costs $20 at a book shop.) (I just finished financial accounting and it was a huge help for me.) http://www.education.ti.com/en/us/guidebook/search/graphing-calculators
the difficulty of finding a replacement LCD maybe would cost more than having a new one. and even if can find a replacement, installing it would again be very difficult! circuit to LCD connector is fixed, once remove, there'll be no guarantee that it would still function normally! try to disassemble your calculator and see if you can manage to disconnect and reconnect the LCD itself!
try this, try reseting the calculator blind. hit 2nd then + then 7 then 1 then 2. That's how you reset it on an 83,84,89 and so on. if you have a friend see how he resets his 82 and try it the same way. It could just be that your screen is ruined. this can happen if it gets alot of pressure in a back pack. GOOD LUCK