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Not Telling
Surely the LCD module was not happy to feel its power supply inverted.
Oh, well...the power inversion is one way to damage a circuit, but it could be still okay.
Anyway, if the wiring is correct and the display does not show anything, probably means that it's blown off.
By turning left-right the trimpot, don't you see any row made by dark blocks?
Cheers
Hi, I have the same problem! The pins are connected according to the datasheet, the backlight works but I can't get the black squares to appear. Just to make sure, the Vss, Vdd and contrast are connected to GND and 5V ports and there should be some response on the screen regardless of the DB pins?
And I'm almost certain I didn't invert the power supply.
Any ideas? Momentarily I don't have the 10K pot but instead using 4.7K resistor that should do the trick.
