kngdmond

I'm having an issue with an 7" LCD touch screen and hoping someone might be able to give me some insight of where to look for a solution. I've posted once before but at that time the LCD would not display at all but I've managed to get it to show up with mixed results. If I plug the HDMI into a tv, the display works fine. Plugging into an LCD 7" made for an rPi the screen would be blue with no display. I edited /boot/armbianEnx.txt and added: extraargs=drm_kms_helper.edid_firmware=HDMI-A-1:edid/800x480.bin video=HDMI-A-1:800x480@60. I know the is oddball, but that's the actual size of the display and by adding this line I was able to boot into Armbian with a working display on the 7" screen. I did try setting the line to 640x480, 1280x720, and 1920x1080. I'd get no display with those settings. The only one that would show a display booting was 800x480. I did go to github and added LCDshow config lines for the LCD7B to armbianEnv.txt. After adding LCDshow config lines and rebooting, 640x480 still had no display, but 720p, and 1080p booted to a black screen. What I can't figure out is, if I boot using 800x480 with the 7" LCD I get a display but it breaks anything using SDl. I get an error saying lvl0: Error initializong SDL! No currently active connector found. But if I plug in a tv, boot, anything using SDL works. If I hot swap the HDMI from the tv to the 7" LCD, the display works including SDL. But the moment you change menu items or anything that requires an interaction with SDL, the screen will go black. If I hot swap the HDMI back to the tv, I see the SDL error No currently active connector found. I tested hot swapping from the TV to the 7" with 720p and 1080p and was able to get a display with SDL but with the same results once I change a menu or did something that required interaction with SDL the screen would go black. Although the screen would not go black using the 800x480, the display would remain on and just present the SDL error. So my question is why does the LCD display work by hot swapping. I've searched Google to try to find a solution, a file to modify, etc and I come up empty handed. Any ideas?? Thank you.

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.

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.