Help needed with 16x2 lcds

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hey guys,
i have run code found in http://arduino.cc/en/tutorial/liquidcrystal. reason cannot see displayed on lcd, accept 16 black rectangles. so, have idea problem be. black boxes hade when turn potentiometer. there anyway can use lcd display breadboard without soldering headers. hope help.

thanks.

provide web link lcd purchased, high resolution pictures of display, how connected @ display , @ arduino. have solder headers lcd. there no other way connect else.


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