PiGRRL 2 screen brightness

[Dmfx22]

Help! I built the PiGRRL 2 all ok but the screen is too bright, I swapped it for the screen in my other PiGRRL 2 and it was fine. Same hardware just swapped screens, does that mean the screen is faulty??

[adafruit_support_mike]

Aside from the difference in brightness, does the display work?

[Dmfx22]

hi, yes the display works, its just too bright - see pics. i already had a pigrrl2 so tried my new screen in that and you can see the results. after 60 secs when the screen dims it is fine. i made sure there was no continuity between the points on the pin 18 pad on the rear.

[adafruit_support_mike]

Hmm.. that could be some kind of signal or driver problem.

Let me check with the folks who worked on that hardware.

[Dmfx22]

thanks! it is a strange problem!!

[adafruit2]

i *think* its fast signals smooshing together, did you overclock the display? you may have to back it down
basically do this
https://learn.adafruit.com/adafruit-pit ... faq#faq-10
but *backwards* so its 25MHz?
it could also be the wires are a little too long.

[Dmfx22]

Hi, I didn't over clock it and the screen is directly on the pi gpio pins. The pictures of the screens were on the same hardware, I only swapped the screens to test it. No settings were changed at all. So as the screens are identical shouldn't they work the same? I wouldn't have to change any settings ? I'm also using the PiGRRL 2 image from your project page, which is fine with the other screen!

[adafruit2]

the pigrrl image probably overclocks, so yeah plz try reducing the overclock, it will help us debug

[Dmfx22]

hi, didn't work :-(

pics show before and after config.txt and a shot of the screen after and the screen is the same.

[adafruit2]

ok im not sure what is going on but we can replace this pitft and see if that helps - im not convinced it isnt wiring but you'll find out if both dont work! :)

email support@adafruit for a new pitft

[Dmfx22]

Hi, if it were wiring then the other screen would be the same?

Thanks for your help with this, I'm in the UK, will this make a difference with the return?

[adafruit2]

no, email support@adafruit for a new pitft

[Dmfx22]

Thanks :-)

[Dmfx22]

hi, had a new screen delivered today and it is fine so it must have been a dodgy screen :-(

thanks for your help on this!!