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As David mentioned, it's all in the alignment and uninterrupted IR transmission through the special black plastic that is attached to the "front cover"/bezel. Make sure there is nothing between the IR transistors and the scalloped edges of the black plastic. Some have had a piece of black tape move in the way. It doesn't take much to cause a problem there, even some tape glue residue could disrupt the IR beams. I have had to repeatedly clean the black plastic to get my touchscreen working one time.
Luck;
Ken
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