16x2 LCD Plate - Raspi - no text displayed

EL Wire/Tape/Panels, LEDs, pixels and strips, LCDs and TFTs, etc products from Adafruit

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hoerster
 
Posts: 1
Joined: Sat Jul 20, 2013 4:17 am

16x2 LCD Plate - Raspi - no text displayed

Post by hoerster »

Hi, and thanks for your great products.

I bought and soldered one of those LCD Plates, and everything is working fine (buttons, backcolor cycle), except that I can't seem to get it to display text. This is what it looks like when I run this slightly shortened example code:

Code: Select all

from time import sleep
from Adafruit_CharLCDPlate import Adafruit_CharLCDPlate

lcd = Adafruit_CharLCDPlate()

lcd.clear()
lcd.message("Adafruit RGB LCD\nPlate w/Keypad!")
lcd.backlight(lcd.GREEN)
sleep(10)
lcd1.jpg
lcd1.jpg (472.63 KiB) Viewed 782 times
lcd2.jpg
lcd2.jpg (544.94 KiB) Viewed 782 times
Any ideas?

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adafruit_support_rick
 
Posts: 35092
Joined: Tue Mar 15, 2011 11:42 am

Re: 16x2 LCD Plate - Raspi - no text displayed

Post by adafruit_support_rick »

In the top picture, the solders on the PI header pins and on the LCD pins don't appear to have flowed well onto the pads. Your display problems are very likely caused by poor electrical connections in the solders. In cross-section, solders should look like this:
Solder%20Joint.gif
Solder%20Joint.gif (7.78 KiB) Viewed 739 times
They should be smooth and shiny, with a convex surface, and they should flow completely onto the pads.

Please review our Guide To Excellent Soldering for more tips!
http://learn.adafruit.com/adafruit-guid ... lder-joint

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