adafruit wrote:it sounds like something was wrong with the 4050 or the wiring. if you tie the LED pin to ground that will turn off the LEDs - just dont leave the pin floating
Connect pin 1 of the 4050, the LCD VCC pin and the LCD backlight pin to 3.3V.
Connect pin 8 of the 4050 and the GND pin of the LCD to ground.
Connect the RST (reset) pin of the LCD (orange wire) to pin 2 of the 4050
Connect the CS (chip select) pin (yellow wire) to pin 4 of the 4050.
Connect the D/C (data/command) pin (green wire) to pin 6 of the 4050
DIN (data in) pin (blue wire) to pin 15 of the 4050
CLK(clock) pin (purple wire) to pin 12 of the 4050
Arduino pin 3 (orange) goes to pin 3 of the 4050.
Arduino pin 4 (yellow) goes to pin 5 of the 4050.
Arduino pin 5 (green) goes to pin 7 of the 4050.
Arduino pin 6 (blue) goes to pin 14 of the 4050.
Arduino pin 7 (violet) goes to pin 11 of the 4050
Stu.C wrote:I had similar problems with a bad 4050 with a different display.
To confirm it's duff, move the 4050 to some free space on the breadboard, connect 3.3V to pin 1 and GND to pin 8. Then connect 5V to pin 3 and check with your multimeter that pin 2 is giving 3.3V. If that one's fine, work your way round each of the in/out pairs and repeat the test for each. Anything other than 3.3V from the outputs and you should put the 4050 in the bin.
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