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Adafruit 5" 800x480 TFT HDMI Backpack - Raspberry Pi Zero W
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Adafruit 5" 800x480 TFT HDMI Backpack - Raspberry Pi Zero W

by edorgeville on Wed Sep 20, 2017 11:50 am

Hi,
We have ordered 5" and 7" 800x480 screens.
I have followed the tutorial to set it up on Raspbian, more specifically the config part.
Unfortunately, the 5" doesn't seem to be working with our Raspberry Pi Zero W.
The distro for the Raspberry Pi Zero W is 2017-08-16-raspbian-stretch-lite.img, fresh (tested with non-lite, same results).

Here's what I tested :
- Rpi0W, 5" with config.txt set : NOT Working
- Rpi0W, 7" with config.txt set : Working
- Win10, 5" : Working
- Win10, 7" : Working

Here is a video showing what happens when we plug the screens :
https://i.imgur.com/5GAK69z.gifv

It looks like the last row of pixels is repeated on the whole screen (the green would be the tmux footer).

Any idea what's happening ?
Thanks,
Erwan

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Re: Adafruit 5" 800x480 TFT HDMI Backpack - Raspberry Pi Zer

by edorgeville on Wed Sep 20, 2017 3:49 pm

Just tested the same microSD card in a Raspberry Pi 3 model B, both screens works.

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Re: Adafruit 5" 800x480 TFT HDMI Backpack - Raspberry Pi Zer

by adafruit_support_mike on Thu Sep 21, 2017 2:29 am

The current version of Raspbian is only about two weeks old at this point, and is the first-ever version based on Linux Stretch. Previous versions for the past couple of years have been based on Raspbian Jessie.

Major changes like that tend to break things, and right now we're still finding out what those are. It sounds like you might be seeing the effects of some change in the HDMI code as it affects the different microprocessors.

At the moment, our best advice is to drop back to a late version of Jessie.. that's where all the code has an established history of working and being debugged. You can find the older OS images here:

http://downloads.raspberrypi.org/raspbian/images/

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Re: Adafruit 5" 800x480 TFT HDMI Backpack - Raspberry Pi Zer

by edorgeville on Thu Sep 21, 2017 12:08 pm

Thanks for your answer, I didn't think about that.
Unfortunately, I just tested with the last avaialable jessie version (2017-07-05-raspbian-jessie.img) and the edited config.txt, and the results are identical.
Do you know which version your tutorial was based on ?

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Re: Adafruit 5" 800x480 TFT HDMI Backpack - Raspberry Pi Zer

by adafruit_support_mike on Fri Sep 22, 2017 2:00 am

It should be good for all versions of Jessie.

The weird thing is that both HDMI converters use the same chip.. the TFP401. They should look identical to the RasPi.

Try adding:

Code: Select all | TOGGLE FULL SIZE
config_hdmi_boost=7
to the Zero-W's /boot/config.txt file. That increases the strength of the HDMI signal, and the current level might be just on the edge of what the backpack can understand.

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Re: Adafruit 5" 800x480 TFT HDMI Backpack - Raspberry Pi Zer

by jacksonk73 on Sat Sep 23, 2017 1:57 am

My 5" HDMI backback was not working until I added the following 3 lines to the config.txt file on the SD Card. I found this mentioned in the YouTube link below.
hdmi_group=2
hdmi_mode=87
hdmi_cvt 800 480 60 6 0 0 0

https://youtu.be/SbKkR57wpcY

adabox005_kj.jpg
5" HDMI backpack (from Digi-key) with ADABOX005
adabox005_kj.jpg (80.65 KiB) Viewed 124 times

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Re: Adafruit 5" 800x480 TFT HDMI Backpack - Raspberry Pi Zer

by Bergkatse on Thu Sep 28, 2017 8:35 pm

From the article:

Raspberry Pi Config
by lady ada

Both 5" and 7" displays have 800x480 pixels, and when used on Windows, at least, will autodetect and set the resolution. On Raspberry Pi, you're better off forcing the HDMI resolution by using the following config.txt file (in /boot/config.txt) - you can edit it by popping the SD card into your computer, the config.txt file is in the root directory

https://learn.adafruit.com/adafruit-5-8 ... -pi-config

config.txt file

# uncomment to force a specific HDMI mode (here we are forcing 800x480!)
hdmi_group=2
hdmi_mode=1
hdmi_mode=87
hdmi_cvt=800 480 60 6 0 0 0

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