Question about Texas Instruments TI-89 Calculator
The leads to the screen have probably been broken by trauma (dropping), and can be repaired if you have a soldering iron, a steady hand, and don't mind voiding the warranty on your calculator by opening it. On the top and left of the screen (from the front) are the rows of leads into the screen. Close inspection should tell you which ones are broken, and solder should be placed over the broken area. The difficulty arises in that you cannot allow the solder to cross the leads, and so must use tiny amounts. A stereoscopic microscope comes in helpful for this procedure.
Posted on Aug 29, 2007
It sounds like the lcd is either defective or damaged by liquid spill or dropped. Not feasible to repair. John
Posted on Jun 16, 2007
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