Tinkerboard 7" HDMI No Signal

[kngdmond]

Sorry if this is the wrong place.  I'm a noob to all this.  I've searched the help files, Google, forum posts and can't find anything regarding a tinker board and no signal issue.  I've only been able to find posts about Rasberry Pi Orange, and the solution used in those posts don't seem to apply here.

I have an Asus Tinkerboard (not the S). 
I bought a 7" HDMI touch screen which was advertised as being Rasberry Pi compliant. 

7" 800 x 480 HDMI-B TOUCHSCREEN FOR RASPBERRY PI
https://www.velleman.eu/products/view/?id=439070
This screen doesn't use pins, just an HDMI port out.

I've flashed different versions of Debian Stretch, Ubuntu, Debain based RetroPie images from the Asus website and the screen display works just fine.  But when I flash any version of Armbian, I get "no signal" from the 7" screen.  If I plug the tinker board into a 32" or 47" tv, with any version of Armbian, I get a display.  I've seen a few posts where people managed to get their screens to work, but no details on how they got them to work or the brand name of the screen they used.  I'm not sure where to look to find an answer.  I'm trying to make a portable device.

I currently have the following installed: 

Title:                  Armbian 5.60 Tinkerboard Debian stretch default
Kernel:                 Linux 4.4.156
Build date:             19.09.2018

The tinker board is running on a 2.5 v power supply.  The 7" screen is running on its own power.  I've used 3 different HDMI cables with the same result.  Works on a tv but not the 7" screen. 

Can someone please point me in the right direction to try to get this screen to work with Armbian?
Thank you.




 

[TonyMac32]

Hmmm, I have a 7" hdmi, the only board I own that will work with it is the Tinkerboard...  If the RPi touchscreen patches have been disabled (I'm still catching up) then the Tinker won't have the mode lines for the oddball resolution, so it doesn't know what to do with the display.  If they aren't, well, Rockchip has been in a constant cycle of breaking their kernel's backward compatibility, so I can only assume one of the other patches is causing issue.

 

Can you start the tinkerboard with the 7" HDMI, then change monitors and then post the output of armbianmonitor -u ?

[kngdmond]

Thank you for replying.  I booted the tinker board with the 7" display attached, had "no signal".  Without unplugging anything, I used putty to remotely login.  I ran sudo armbianmonitor -u.  A dialog appeared saying "System diagnosis information will be uploaded to Please post the url in the forum where you've been asked for."   I'm not sure if anything was uploaded or to where.

I just think its odd that this generic 7" works with everything but Armbian.

Here's a little more detail about the touch screen.

= 7’’ standard display, 800 × 480 resolution capacitive touch screen, maximum support 5 point touch
= Support backlight control alone, the backlight can be turned off to save power
= Supports standard HDMI interface input, compatible with and can be directly inserted with Raspberry Pi (3rd, 2nd, and 1st generation)
= Can be used as general-purpose-use HDMI monitor, for example: connect with a computer HDMI as the sub-display (resolution of the output has to be able to adjust to 800X480)
= Used as a raspberry pie display that supports Raspbian, Ubuntu, Kodi, win10 IOT, single-touch, free drive
= Work as a PC monitor, support win7, win8, win10 system 5 point touch (XP and older version system: single-point touch), free drive
= CE, RoHS certification

For Rasbian System, Ubuntu, Windows 10 it says  to:

Modify the “config.txt”
Open the config.txt file of TF card root directory and add the following
code at the end of the file, save and eject TF card safely:

max_usb_current=1
hdmi_group=2
hdmi_mode=1
hdmi_mode=87
hdmi_cvt 800 480 60 6 0 0 0

Armbian doesn't use a config.txt file.....has the AmbienEnv.txt.  Been reluctant to mess with it.