# HyperPixel no backlight? **URL:** \ **Category:** Support\ **Created:** [August 16, 2017, 1:45pm UTC](https://forums.pimoroni.com/t/hyperpixel-no-backlight/5680 "2017-08-16T13:45:45Z")\ **Posts on this page:** 13\ **Page:** 1
**Author:** ![povezi](https://avatars.discourse-cdn.com/v4/letter/p/b487fb/32.png) [@povezi](https://forums.pimoroni.com/u/povezi)\ **Post date:** [August 16, 2017, 1:45pm UTC](https://forums.pimoroni.com/t/hyperpixel-no-backlight/5680/1 "2017-08-16T13:45:45Z")
Hi, I have fresh retropie installation on Rpi2. installed using script HyperPixel, and I can see text but hardly (backlight is not turned on) tried this: root@retropie:/home/pi# echo “0” \> /sys/class/backlight/rpi\_backlight/brightness root@retropie:/home/pi# cat /sys/class/backlight/rpi\_backlight/brightness 0 root@retropie:/home/pi# echo “1” \> /sys/class/backlight/rpi\_backlight/brightness root@retropie:/home/pi# cat /sys/class/backlight/rpi\_backlight/brightness 1 but no luck :( chould I somehow additionally enable backlight? ---
**Author:** ![RaspberryPicardBox](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/raspberrypicardbox/32/7454_2.png) [@RaspberryPicardBox](https://forums.pimoroni.com/u/RaspberryPicardBox)\ **Post date:** [August 16, 2017, 2:15pm UTC](https://forums.pimoroni.com/t/hyperpixel-no-backlight/5680/2 "2017-08-16T14:15:27Z")
Just double check to make sure that `"# Use a basic GPIO backlight driver with on/off support dtoverlay=hyperpixel-gpio-backlight"`is definitely in your `config.txt` file. You can find it in `/boot`. This line should enable the generic backlight driver, so it’s possible that in your case it’s never being enabled. Also, double check your GPIO connections to make sure they’re all making good contact! ---
**Author:** ![povezi](https://avatars.discourse-cdn.com/v4/letter/p/b487fb/32.png) [@povezi](https://forums.pimoroni.com/u/povezi)\ **Post date:** [August 16, 2017, 2:17pm UTC](https://forums.pimoroni.com/t/hyperpixel-no-backlight/5680/3 "2017-08-16T14:17:42Z")
Thank you for the tip, it is enabled already :( Is it possible that backlight is dead? Here are the last lines of config: # Enable audio (loads snd\_bcm2835) #dtparam=audio=on #gpu\_mem\_256=128 #gpu\_mem\_512=256 #gpu\_mem\_1024=256 #overscan\_scale=1 # HyperPixel LCD Settings dtoverlay=hyperpixel overscan\_left=0 overscan\_right=0 overscan\_top=0 overscan\_bottom=0 framebuffer\_width=800 framebuffer\_height=480 enable\_dpi\_lcd=1 display\_default\_lcd=1 dpi\_group=2 dpi\_mode=87 dpi\_output\_format=0x6f016 display\_rotate=2 hdmi\_timings=800 0 50 20 50 480 1 3 2 3 0 0 0 60 0 32000000 6 # Use a basic GPIO backlight driver with on/off support dtoverlay=hyperpixel-gpio-backlight ---
**Author:** ![RaspberryPicardBox](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/raspberrypicardbox/32/7454_2.png) [@RaspberryPicardBox](https://forums.pimoroni.com/u/RaspberryPicardBox)\ **Post date:** [August 16, 2017, 2:23pm UTC](https://forums.pimoroni.com/t/hyperpixel-no-backlight/5680/4 "2017-08-16T14:23:06Z")
That should be working fine! I’d recommend checking you GPIO connections first, and if that doesn’t work, contact [support@pimoroni.com](mailto:support@pimoroni.com) to get a replacement unit sorted out. It’s possible it got damaged during transport or instillation due to it being so fragile! ---
**Author:** ![povezi](https://avatars.discourse-cdn.com/v4/letter/p/b487fb/32.png) [@povezi](https://forums.pimoroni.com/u/povezi)\ **Post date:** [August 16, 2017, 2:24pm UTC](https://forums.pimoroni.com/t/hyperpixel-no-backlight/5680/5 "2017-08-16T14:24:44Z")
it was packed nice, and installed carefully … maybe factory dead backlight :(( ---
**Author:** ![RaspberryPicardBox](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/raspberrypicardbox/32/7454_2.png) [@RaspberryPicardBox](https://forums.pimoroni.com/u/RaspberryPicardBox)\ **Post date:** [August 16, 2017, 2:33pm UTC](https://forums.pimoroni.com/t/hyperpixel-no-backlight/5680/6 "2017-08-16T14:33:47Z")
Possibly! Of course, there’s always the chance of a software fix. Mr @Gadgetoid , I summon thee! ---
**Author:** ![povezi](https://avatars.discourse-cdn.com/v4/letter/p/b487fb/32.png) [@povezi](https://forums.pimoroni.com/u/povezi)\ **Post date:** [August 16, 2017, 2:35pm UTC](https://forums.pimoroni.com/t/hyperpixel-no-backlight/5680/7 "2017-08-16T14:35:00Z")
I will check backlight pin on my Rigol scope… ---
**Author:** ![gadgetoid](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/gadgetoid/32/13_2.png) [@gadgetoid](https://forums.pimoroni.com/u/gadgetoid)\ **Post date:** [August 16, 2017, 2:56pm UTC](https://forums.pimoroni.com/t/hyperpixel-no-backlight/5680/8 "2017-08-16T14:56:02Z")
I’ve seen a couple with non-functioning backlights, but I’m not sure how they slip through since we’re testing the displays very thoroughly before shipping and the backlight isn’t particularly delicate. I have a display that I’ve removed from its metal shielding and separated into layers and the backlight _still_ works. Still, do double check that there isn’t something wrong with your backlight pin (BCM 19 iirc) and also verify you don’t have any other software which could be running and claiming this pin for its own purposes. If all else fails, let us know and we’ll sort out a replacement. ---
**Author:** ![povezi](https://avatars.discourse-cdn.com/v4/letter/p/b487fb/32.png) [@povezi](https://forums.pimoroni.com/u/povezi)\ **Post date:** [August 16, 2017, 4:10pm UTC](https://forums.pimoroni.com/t/hyperpixel-no-backlight/5680/9 "2017-08-16T16:10:30Z")
Hey Gadgetoid, thank you for your answer! Just tell me, logic level should be high on BCM19 in order for backlight to be ON? I’ll check with scope, so I will eliminate “software” problems for sure… ---
**Author:** ![povezi](https://avatars.discourse-cdn.com/v4/letter/p/b487fb/32.png) [@povezi](https://forums.pimoroni.com/u/povezi)\ **Post date:** [August 16, 2017, 10:18pm UTC](https://forums.pimoroni.com/t/hyperpixel-no-backlight/5680/10 "2017-08-16T22:18:53Z")
Hi Gadgetoid, I have just checked with scope, if I type: echo “0” \> /sys/class/backlight/rpi\_backlight/brightness Voltage on BCM19 (pin 35) goes to logic low 0v if I type: echo “1” \> /sys/class/backlight/rpi\_backlight/brightness Voltage on BCM19 (pin 35) goes to logic high 3v TFT stays dark :( backlight is DOA what should I do? Who to contact? Thank you ---
**Author:** ![povezi](https://avatars.discourse-cdn.com/v4/letter/p/b487fb/32.png) [@povezi](https://forums.pimoroni.com/u/povezi)\ **Post date:** [August 16, 2017, 10:43pm UTC](https://forums.pimoroni.com/t/hyperpixel-no-backlight/5680/11 "2017-08-16T22:43:29Z")
Just tested with different OS (Raspbian) / different Raspberry (v3 instead of v2)… backight is dead :( ---
**Author:** ![RaspberryPicardBox](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/raspberrypicardbox/32/7454_2.png) [@RaspberryPicardBox](https://forums.pimoroni.com/u/RaspberryPicardBox)\ **Post date:** [August 17, 2017, 8:49am UTC](https://forums.pimoroni.com/t/hyperpixel-no-backlight/5680/12 "2017-08-17T08:49:39Z")
Hi there Povezi! Sorry to see that your screen is broken. :/ If you send an email to [support@pimoroni.com](mailto:support@pimoroni.com) asking for a replacement unit and give a link to this thread they’ll get you sorted out. :) I hope your next one fares better! ---
**Author:** ![povezi](https://avatars.discourse-cdn.com/v4/letter/p/b487fb/32.png) [@povezi](https://forums.pimoroni.com/u/povezi)\ **Post date:** [August 17, 2017, 9:01am UTC](https://forums.pimoroni.com/t/hyperpixel-no-backlight/5680/13 "2017-08-17T09:01:41Z")
Thank you! I have just sent email…