# Hyperpixel 4.0 inch square touch not working

**URL:** <https://forums.pimoroni.com/t/hyperpixel-4-0-inch-square-touch-not-working/27225>\
**Category:** Support\
**Created:** [February 2, 2025, 11:04am UTC](https://forums.pimoroni.com/t/hyperpixel-4-0-inch-square-touch-not-working/27225 "2025-02-02T11:04:05Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Nincompoop](https://avatars.discourse-cdn.com/v4/letter/n/57b2e6/32.png) [@Nincompoop](https://forums.pimoroni.com/u/Nincompoop)\
**Post date:** [February 2, 2025, 11:04am UTC](https://forums.pimoroni.com/t/hyperpixel-4-0-inch-square-touch-not-working/27225/1 "2025-02-02T11:04:05Z")

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Hi,

I have a Hyperpixel 4 inch square display that I would like to start using again. It’s been in a closet for a couple of years. I only get a weird blotch and no image. How to debug this?

I did:

- grab a Pi 3B & 8GB sd card;
- installed a fresh Raspberry Pi OS with desktop (old fashioned, with dd);
- tried this first with a regular monitor, mouse and keyboard - this worked.

I added:

- dtoverlay=vc4-kms-dpi-hyperpixel4 to /boot/firmware/config.txt;
- enabeld I2C;
- a reboot.

No image. HDMI still works. Should I disable that?

The display shows this weird blotch:

 ![effe](https://us1.discourse-cdn.com/flex016/uploads/pimoroni/original/2X/3/345b424ce288e3e08c5e9ee7fed255c10ba098db.jpeg)

Nothing stands out in dmesg or the logs.

Thanks!  
Ferenc

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<div class="post-metadata">

**Author:** ![alphanumeric](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/alphanumeric/32/2729_2.png) [@alphanumeric](https://forums.pimoroni.com/u/alphanumeric)\
**Post date:** [February 2, 2025, 11:35am UTC](https://forums.pimoroni.com/t/hyperpixel-4-0-inch-square-touch-not-working/27225/2 "2025-02-02T11:35:35Z")

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> [@Nincompoop](#):
>
> enabeld I2C

You will need to have I2C **disabled** (`sudo raspi-config nonint do_i2c 1` ) along with any other interfaces that use the GPIO.

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<div class="post-metadata">

**Author:** ![Nincompoop](https://avatars.discourse-cdn.com/v4/letter/n/57b2e6/32.png) [@Nincompoop](https://forums.pimoroni.com/u/Nincompoop)\
**Post date:** [February 2, 2025, 8:35pm UTC](https://forums.pimoroni.com/t/hyperpixel-4-0-inch-square-touch-not-working/27225/3 "2025-02-02T20:35:44Z")

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I disabled I2C but still the weird blotch in the middle.

It slowly appears when I apply power to the Pi.

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<div class="post-metadata">

**Author:** ![Nincompoop](https://avatars.discourse-cdn.com/v4/letter/n/57b2e6/32.png) [@Nincompoop](https://forums.pimoroni.com/u/Nincompoop)\
**Post date:** [February 2, 2025, 9:07pm UTC](https://forums.pimoroni.com/t/hyperpixel-4-0-inch-square-touch-not-working/27225/4 "2025-02-02T21:07:42Z")

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I wiggled the GPIO header (where the hyperpixel connects to the Pi) somewhat and now I have moving, colored lines. Progress!

![IMG_4770](https://us1.discourse-cdn.com/flex016/uploads/pimoroni/original/2X/e/e5dd832021acd30518e8d2fc643c9f5992bed89c.gif)