# Inky Phat on a Pi 3 **URL:** \ **Category:** Support\ **Created:** [August 12, 2018, 11:28am UTC](https://forums.pimoroni.com/t/inky-phat-on-a-pi-3/8350 "2018-08-12T11:28:38Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![Prof](https://avatars.discourse-cdn.com/v4/letter/p/94ad74/32.png) [@Prof](https://forums.pimoroni.com/u/Prof)\ **Post date:** [August 12, 2018, 11:28am UTC](https://forums.pimoroni.com/t/inky-phat-on-a-pi-3/8350/1 "2018-08-12T11:28:38Z")
I get terrible display quality when I try to use my new red Inky on a Pi 3 but it’s OK on a Pi zero W. Is the library doing some loop based timing somewhere? As a new user I can only post one image so here is the Pi 3 display: ![image](https://us1.discourse-cdn.com/flex016/uploads/pimoroni/original/2X/1/1357ec247259f4668d5d6e9c38db6de4dca59416.jpeg) Edit: I should point out that I’m using the same SD card and display for both tests and simply swapping the Pi out from between them. ---
**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 12, 2018, 5:01pm UTC](https://forums.pimoroni.com/t/inky-phat-on-a-pi-3/8350/2 "2018-08-12T17:01:04Z")
Cripes! That’s awful. There are no timing based loops- the update cycles are all running directly on the Inky pHAT. I wonder if it’s something to do with temperature? I can’t think of anything else that might be causing it- except perhaps a power shortage? ---
**Author:** ![Prof](https://avatars.discourse-cdn.com/v4/letter/p/94ad74/32.png) [@Prof](https://forums.pimoroni.com/u/Prof)\ **Post date:** [August 13, 2018, 3:02pm UTC](https://forums.pimoroni.com/t/inky-phat-on-a-pi-3/8350/3 "2018-08-13T15:02:22Z")
Don’t think it’s temperature. I literally shut down the Pi 3, swapped the display, SD card and power to the Pi zero and powered it up to get this improved image: ![image](https://us1.discourse-cdn.com/flex016/uploads/pimoroni/original/2X/5/55ef76d5407fc07f45e51eb5c16dcf3dc982cdce.jpeg) Swapping back to the Pi 3 gives the poor image again. No time to heat up or cool down and same power on both. ---
**Author:** ![Prof](https://avatars.discourse-cdn.com/v4/letter/p/94ad74/32.png) [@Prof](https://forums.pimoroni.com/u/Prof)\ **Post date:** [August 13, 2018, 3:04pm UTC](https://forums.pimoroni.com/t/inky-phat-on-a-pi-3/8350/4 "2018-08-13T15:04:38Z")
Oops. Wrong image. I got that on the Pi 3 by telling it I had a yellow display. Still bad, but differently bad. This is the Pi Zero image: ![image](https://us1.discourse-cdn.com/flex016/uploads/pimoroni/original/2X/1/131bbb78141db28ea6ed544277e2bd88cc3691f9.jpeg) ---
**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 13, 2018, 3:12pm UTC](https://forums.pimoroni.com/t/inky-phat-on-a-pi-3/8350/5 "2018-08-13T15:12:21Z")
What power supply are you using? I don’t recognise that connector. ---
**Author:** ![Prof](https://avatars.discourse-cdn.com/v4/letter/p/94ad74/32.png) [@Prof](https://forums.pimoroni.com/u/Prof)\ **Post date:** [August 13, 2018, 3:40pm UTC](https://forums.pimoroni.com/t/inky-phat-on-a-pi-3/8350/6 "2018-08-13T15:40:44Z")
Just a standard 5V 2A USB power supply with the usual USB cable attached. You have, however, correctly identified the problem though. Switching to a 2.5A iPad power supply completely resolved the issue and the quality is better than ever. I did notice that the initial black and white image came out fine and it was only when the red overlay occured the problems occured. ![image](https://us1.discourse-cdn.com/flex016/uploads/pimoroni/original/2X/2/2b3452ff40a5342e91a4acdc58065fe8eea5071d.jpeg) Possibly that 8mA is a bit of an understatement and it actually spikes a lot higher when painting the red.