LCD Pi Plate Issue
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LCD Pi Plate Issue

by Colinahscopy on Thu Mar 14, 2013 12:59 am

Hello,

I purchased the 16x2 LCD Pi Plate kit and assembled it this weekend. When I installed it on my Pi and ran the LCDtest python file, all I see is boxes on the top row of characters. I took another step to see if any of the buttons were working, so I ran the Adafruit_CharLCDPlate file and saw that whenever I pressed a button, it will print out the button label and then the right button. (i.e. when i press up, it will print out "Up" and then "Right" on a new line right after it)

Is there a way to fix this issue?

Thanks,
Colin K.
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Re: LCD Pi Plate Issue

by adafruit_support_bill on Thu Mar 14, 2013 6:46 am

Post photos of the front & back and we'll check the assembly.
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Re: LCD Pi Plate Issue

by Colinahscopy on Thu Mar 14, 2013 1:01 pm

Here is a picture of the front:
Image

And the back:
Image
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Re: LCD Pi Plate Issue

by wildtang3nt on Fri Mar 15, 2013 1:44 am

It looks like you didn't solder the last two backlight pins towards the middle of the LCD header on the back side.
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Re: LCD Pi Plate Issue

by adafruit_support_bill on Fri Mar 15, 2013 7:01 am

It looks like you didn't solder the last two backlight pins towards the middle of the LCD header on the back side.

Actually, I think that is the monochrome version of the display. It only has 16 pins.

The soldering on the display part looks fine. The rest (buttons and processor) are out of focus. Can you post a clearer shot of that part of the soldering?

From the symptoms you describe, I suspect that a marginal connection may have left the right button 'floating' so that it picks up spurious signals when you press other buttons.
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Re: LCD Pi Plate Issue

by Colinahscopy on Fri Mar 15, 2013 7:04 pm

Here is a link to a close-up of the lower portion of the plate.
http://i.imgur.com/CZ75A83.jpg(Front)
http://i.imgur.com/KETKyAP.jpg(Back)
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Re: LCD Pi Plate Issue

by adafruit_support_bill on Sat Mar 16, 2013 6:20 am

Thanks, those photos are much clearer. A few of the solder joints on the chip (including the one that connects to the "right" button) look a bit solder-starved, and the solder has not flowed well onto the pad. Look it over closely and re-touch any joints that look suspicious.

http://learn.adafruit.com/adafruit-guid ... n-problems
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Re: LCD Pi Plate Issue

by Colinahscopy on Sat Mar 16, 2013 5:12 pm

I soldered the connections that were solder-starved. When I booted up my Pi and tried running the test program, the issue still persists. The first row is still just block characters and the right button shows when I press any of the other buttons.
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Re: LCD Pi Plate Issue

by adafruit_support_bill on Sun Mar 17, 2013 6:53 am

Alright. Double check the soldering on the SDA and SCL pins of the GPIO header and touch up if necessary. If that doesn't change anything, contact support@adafruit.com with a link to this thread for a replacement.
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