# Problem on HDMI when Porting Pynq-Z1 to Zybo Z7-20

**URL:** https://discuss.pynq.io/t/problem-on-hdmi-when-porting-pynq-z1-to-zybo-z7-20/1395
**Category:** Support
**Created:** [June 20, 2020, 9:54am UTC](https://discuss.pynq.io/t/problem-on-hdmi-when-porting-pynq-z1-to-zybo-z7-20/1395 "2020-06-20T09:54:46Z")
**Posts on this page:** 4
**Page:** 1

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### Author: ![arif-pens](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.pynq.io/arif-pens/32/1007_2.png) [@arif-pens](https://discuss.pynq.io/u/arif-pens)
#### Post date: [June 20, 2020, 9:54am UTC](https://discuss.pynq.io/t/problem-on-hdmi-when-porting-pynq-z1-to-zybo-z7-20/1395/1 "2020-06-20T09:54:46Z")

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I could successfully create a custom image for Zybo-Z7-20 board. The custom image is created based on Pynq-Z1 image version 2.5. Basically, the base.bit are composed of all block design from Pynq-Z1 base overlay, except the audio, arduini, and chip kit parts.

All of the based overlays (such as LEDs, Switches, Buttons) are working properly unless the **HDMI** overlay.

When i test the custom image using example code hdmi\_introduction.ipynb , i got following result:

hdmi\_in.configure()  
hdmi\_out.configure(hdmi\_in.mode)

**out: \<contextlib.\_GeneratorContextManager at 0xae8999f0\>**

After **hdmi\_in.start()** and **hdmi\_out.start()** the computer blinks but no video signal is detected.

When I try to run **hdmi\_in.readframe()** , this error is shown: **RuntimeError: DMA channel not started**.

Do you have any suggestion regarding this problem?

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### Author: ![rock](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.pynq.io/rock/32/32_2.png) [@rock](https://discuss.pynq.io/u/rock)
#### Post date: [June 22, 2020, 4:12pm UTC](https://discuss.pynq.io/t/problem-on-hdmi-when-porting-pynq-z1-to-zybo-z7-20/1395/2 "2020-06-22T16:12:49Z")

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What does your setup look like? Any more information that we should know, like resolution and any adapters?

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### Author: ![arif-pens](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.pynq.io/arif-pens/32/1007_2.png) [@arif-pens](https://discuss.pynq.io/u/arif-pens)
#### Post date: [June 23, 2020, 2:18am UTC](https://discuss.pynq.io/t/problem-on-hdmi-when-porting-pynq-z1-to-zybo-z7-20/1395/3 "2020-06-23T02:18:09Z")

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Thank you for your reply. The Zybo-Z7 HDMI input is connected to the HDMI port of my Laptop without adapter while the HDMI output port of Zybo-Z7 is directly connected to FullHD Monitor. I got HDMI input frame resolution of 1920x1080 pixels when i run **print(hdmi\_in.mode)**.

 ![HDMI-error](https://us1.discourse-cdn.com/flex019/uploads/pynq1/original/2X/d/d18105fbab73d1aa23ee6e00ca6c0404d18a1bff.jpeg)

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### Author: ![rock](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.pynq.io/rock/32/32_2.png) [@rock](https://discuss.pynq.io/u/rock)
#### Post date: [June 23, 2020, 4:38am UTC](https://discuss.pynq.io/t/problem-on-hdmi-when-porting-pynq-z1-to-zybo-z7-20/1395/4 "2020-06-23T04:38:47Z")

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This might be a similar problem as [Something Weird: HDMI cannot write frames continuously](https://discuss.pynq.io/t/something-weird-hdmi-cannot-write-frames-continuously/1042)

From there we don’t know the best answer. There are many things you need to adjust for your zybo.