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Possibly Defective LCD
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Please be positive and constructive with your questions and comments.

Possibly Defective LCD

by StankyShanky on Fri May 05, 2017 4:30 pm

I recently purchased an LCD from Adafruit and believe it is defective.

It is a 2" TFT lcd. It has vertical light streaks/stripes across the
screen. Based off the pictures on the listing (product 911), and photos I
have seen of projects using this screen
this is not normal. I believe it is a
problem with the LED diffusers in the backlight of the display, but have not
dismantled the display to confirm.

Here is a gallery of photos of my screen and its light stripes.
Image
Image
Image
Image

Troubleshooting steps I have checked:
-The ribbon cable is not torn, and is properly inserted straight.
-The screen and drive board is not physicaly damaged.
-The power supply is 5v through an isolated, variable linear benchtop power
supply.
-Stripes are consistent despite whats on screen, even with no signal.
-I have slightly peeled back screen protector to ensure its not a pattern on
the screen protector.

StankyShanky
 
Posts: 12
Joined: Fri May 05, 2017 4:13 pm

Re: Possibly Defective LCD

by StankyShanky on Thu May 11, 2017 8:48 pm

It has been nearly a week and I have received no response, while several more recent posts have been addressed. I have tried emailing support and have been told the forums are the only way to get support. My screen is a lemon, and I would like to know if I am going to be able to swap it for a replacement unit, or if I am going to have to issue a chargeback and buy a new display from AliExpress. I really, really do not want to do that, but my project has an approaching deadline and a limited budget. I want to find a way to resolve this without forcing an outside party to get involved.

StankyShanky
 
Posts: 12
Joined: Fri May 05, 2017 4:13 pm

Re: Possibly Defective LCD

by franklin97355 on Thu May 11, 2017 9:45 pm

Sorry for the delay. What are you using for power and what are you driving the display with?

franklin97355
 
Posts: 21508
Joined: Mon Apr 21, 2008 2:33 pm
Location: Lacomb, OR.

Re: Possibly Defective LCD

by StankyShanky on Thu May 11, 2017 9:52 pm

franklin97355 wrote:Sorry for the delay. What are you using for power and what are you driving the display with?

StankyShaky wrote: -The power supply is 5v through an isolated, variable linear benchtop power
supply.
-Stripes are consistent despite whats on screen, even with no signal.


Its driven from a Wii. I have tested the signal on a screen and the signal is clean. The issue is coming from the backlight, not the signal.

StankyShanky
 
Posts: 12
Joined: Fri May 05, 2017 4:13 pm

Re: Possibly Defective LCD

by franklin97355 on Thu May 11, 2017 9:56 pm

OK. Please contact support@adafruit.com with a link to this topic and they will help you

franklin97355
 
Posts: 21508
Joined: Mon Apr 21, 2008 2:33 pm
Location: Lacomb, OR.

Re: Possibly Defective LCD

by StankyShanky on Wed May 17, 2017 3:50 pm

Just following up. I received the new display and initial impressions are good. The light bars present on the old display are not present on the new one. Will make another post if I find an issue, but that isn't likely. Im dissapointed with the amount of effort it took to reach a conclusion, but Im satisfied with how it all worked out.

StankyShanky
 
Posts: 12
Joined: Fri May 05, 2017 4:13 pm

Re: Possibly Defective LCD

by StankyShanky on Thu May 18, 2017 4:34 am

Following up, a second time, we have another problem. The newer screen does not have the backlight issue that the old one did, but the picture is super flickery/jittery, which the first screen with the bad backlight diffuser was not. I can provide a video if necessary. Ive tried using the same drive board with both screens, and each screen has a different problem. I can, however, confirm that both of the driver boards are fully functional.

StankyShanky
 
Posts: 12
Joined: Fri May 05, 2017 4:13 pm

Please be positive and constructive with your questions and comments.