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RGB backlight negative LCD 16x2 - Not Working
Moderators: adafruit_support_bill, adafruit

Please be positive and constructive with your questions and comments.

RGB backlight negative LCD 16x2 - Not Working

by bludadog on Sun Aug 30, 2020 5:16 pm

New RGB backlight negative LCD 16x2

Followed instructions on https://learn.adafruit.com/character-lc ... racter-lcd up to and including contrast circuit, but neither backlight or rectangles are visible.

Connecting to a Elegoo Nano Board (apparently the model is a banned keyword...)

Anything else I should check or just scrap this LCD?

Thx

bludadog
 
Posts: 2
Joined: Sun Aug 30, 2020 5:09 pm

Re: RGB backlight negative LCD 16x2 - Not Working

by adafruit_support_bill on Mon Aug 31, 2020 5:54 am

Please post some photos showing your soldering and connections.

adafruit_support_bill
 
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Joined: Sat Feb 07, 2009 10:11 am

Re: RGB backlight negative LCD 16x2 - Not Working

by bludadog on Sun Sep 06, 2020 7:18 pm

PFA photo:

LCD16x2.jpg
Connections
LCD16x2.jpg (753.01 KiB) Viewed 9 times

bludadog
 
Posts: 2
Joined: Sun Aug 30, 2020 5:09 pm

Re: RGB backlight negative LCD 16x2 - Not Working

by adafruit_support_bill on Mon Sep 07, 2020 5:50 am

Measure the voltage between pins 15 and 18 on the display.

adafruit_support_bill
 
Posts: 78984
Joined: Sat Feb 07, 2009 10:11 am

Please be positive and constructive with your questions and comments.