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2.2" 18-bit color TFT LCD display intermittent hardware fail
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2.2" 18-bit color TFT LCD display intermittent hardware fail

by jimk123 on Mon Jan 21, 2019 8:10 pm

I recently purchased this display and noticed when the example code was running there was one mis-colored pixel in the upper left corner. Then I wrote my own program to display several lines of text in green and depending on the status in the code/sensor change the line to red. (see pic for example, you may have to zoom in to notice on the label "Deck Lights" the top left pixel in the letter "D" did not change)

Then after a few hours the screen just when blank with a white background. I restarted the UNO and it came back and it seems like after a few hours the screen will just go white and I have to restart it. I have double checked and resoldered all the pins on the header strip. One think I noticed on the display if you look at the pic on the bottom there is a yellowish ribbon connector attaching it to the board and chunk of the (insulation ?) appears to be missing in the bottom right side.

thanks
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Re: 2.2" 18-bit color TFT LCD display intermittent hardware

by adafruit_support_carter on Mon Jan 21, 2019 9:32 pm

The soldering looks a little thin on a few pins. Try reflowing them and adding a bit more.

Make sure all your libraries are using latest versions and then try running the graphicstest example:
https://learn.adafruit.com/2-2-tft-disp ... -test-5-10

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Re: 2.2" 18-bit color TFT LCD display intermittent hardware

by jimk123 on Fri Jan 25, 2019 7:54 am

adafruit - I re-soldered all the pins again (see attached pic) Still seeing same behavior where it will run for several hours to a day and then the screen turns white. If I reboot it works fine for another day or so. The unit I have looks like some insulation is missing on the ribbon connector compared to the one on your web site. Could that be the problem ?
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Re: 2.2" 18-bit color TFT LCD display intermittent hardware

by adafruit_support_carter on Fri Jan 25, 2019 12:38 pm

I think that's OK with the display ribbon cable.

It's not working after hours - that could be many things. But what about some the other issues that seemed to happen right away?
when the example code was running there was one mis-colored pixel in the upper left corner.

Is it still doing that?

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Re: 2.2" 18-bit color TFT LCD display intermittent hardware

by jimk123 on Fri Jan 25, 2019 12:54 pm

The missing/wrong pixels come and go, just like the display blanking out after several hours

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Re: 2.2" 18-bit color TFT LCD display intermittent hardware

by adafruit_support_carter on Fri Jan 25, 2019 1:27 pm

Does it do that running the example from the library?
https://learn.adafruit.com/2-2-tft-disp ... -test-5-10

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Re: 2.2" 18-bit color TFT LCD display intermittent hardware

by gyrogale on Tue Sep 10, 2019 12:24 pm

Hi I have a 20x4 PID: 198 and I am having missing pixels and not all my displayed information is showing up. It is a defective screen as I am wiring the unit in the same fashion, same code as the previous ones. Please help

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Re: 2.2" 18-bit color TFT LCD display intermittent hardware

by adafruit_support_carter on Tue Sep 10, 2019 4:09 pm

@gyrogale Please start a new thread for your issue.

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