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Character LCDs / Re: NHD-0 420D 3Z- FL-GBW Backlight brightness won't change .
« on: November 24, 2015, 12:01:26 PM »
I too am having the same problem with a similar display (NHD-0420D3Z-NSW-BBW-V3). Of the 8 displays I ordered, I can only change the black light on 3 of them. On another 3, I can only change the backlight if the display powers up with the backlight already on. I set the back light intensity every 500ms as part of a housekeeping loop. Is there a way to hardwire the back light on continuously? 7 of the 8 will light the backlight in self test mode. I am using I2C at 50khz. All other commands seem to work fine.