rpi 4 with latest libreelec not showing on TV

    Dear All,

    I have an old TV, Acer AT4220 with 720p, to which I have had a Pi 3b connected succesfully in the past. However now that I replaced it with a pi 4b, I only get the boot message on the screen, then the KODI logo and then shortly the menu after that the system has loaded upon which I get some funny color blocks, and then the connection to the tv is lost.

    I guess this has something to do with screen resolution or frequency?

    I can ssh into the pi without issues, also while there´ is no connection to the tv.

    Remove "avoid_warnings=1" from config.txt and post another log.

    If you added it to get rid of "low voltage" warnings then get a better power supply - insufficient power will cause all sorts of issues, especially the one you mentioned.

    so long,

    Hias

    Thanks, the log looks fine to me though, RPi4 is outputting 1280x720p60.

    It might be worth testing with a direct connection from RPi to the TV (taking the AVR out of the chain) and also using a different HDMI cable - all of that could cause issues.

    Oh and if you are using a case (esp an Argon One) try without it. Argon cases have a long history of causing HDMI issues and personally I had an issue with another case because the micro HDMI connector couldn't be fully inserted with it (thus causing intermittent contact problems).

    so long,

    Hias

    Thanks, the one I´m using is Highpi Pro universal case for the RPI 4

    The setup works fine on my monitor, but I should perhaps add that there´s an Onkyo amp with HDMI inbetween the pi and the tv, so I will see if switching ports or bypassing the amp could provide a different result.

    Btw, the tv´s resolution is not 1280x720p but in fact 1,366x768. Could this be the problem?

    The AVR eventually sends a wrong HDMI mode to the TV, and interferes HDMI negotiation.

    To avoid this, edit cmdline.txt, and append this to the end of the line:

    Code
    video=HDMI-A-1:1280x720@60D
    Quote from Da Flex

    The AVR eventually sends a wrong HDMI mode to the TV, and interferes HDMI negotiation.

    To avoid this, edit cmdline.txt, and append this to the end of the line:

    Code
    video=HDMI-A-1:1280x720@60D

    Unfortunately that made no difference :(

    The pi works fine with the case when connecting it to a monitor. I tried connecting it directly to the TV and got no image at all at any time. I will try to do that again next week, since I managed only to connect to one of the HDMI inputs because of cable length. Who knows if there´ is an issue with that input... I wanna rule out everything.

    Some good news: I decided to reinstall libreelec one more time and connect the pi directly to the tv during the setup process. Previously I did this via my monitor.

    This worked smoothly, and I even tested it afterwards to do the job well.

    Unfortunately, when I assembled the case completely, meaning to attach the hifiberry board that I use with it and close the lid, something went wrong when I connected it again: The image was gone :(

    I tried to take off both the lid and the hifiberry again, but the result was the same. Tried again on my monitor, but no luck.

    My theory is that I broke something in the HDMI cable when pulling it in and out or perhaps when putting the case together, which required a hard slap on it, while the cable was still connected - obviously the power was off at that point.

    I dare not trying with my other HDMI cable which is connecting another pi that I use as a thin client for my work computer elsewhere in the house, since I do not want to risk the same thing happening to that cable. I know these cables break very easily, so I guess I will order a new one and give it another try...
    Anyway: The point must be that libreelec may be very fragile to whatever screen was used during setup, dont you think?

    Quote from Da Flex

    Nah, if you use the above cmdline.txt options, then it always starts with the same HDMI mode.

    In fact, I did a reinstallation where everything looked as it should on the monitor untill I added video=HDMI-A-1:1280x720@60D to cmdline.txt. After that, I got no picture at all, not even after removing that line, so this is the point where I did another reinstallation. I did not try vc4.force_hotplug=1 at any point though.

    Quote from jazzlpunk

    In fact, I did a reinstallation where everything looked as it should on the monitor untill I added video=HDMI-A-1:1280x720@60D to cmdline.txt. After that, I got no picture at all, not even after removing that line, so this is the point where I did another reinstallation. I did not try vc4.force_hotplug=1 at any point though.

    Hi, What kind of monitor did you use for RPi4 setup, and what is the max. supported resolution? The 720p resolution is something standard for TV's. Something very strange happening with your RPi4 setup. Could be the HDMI cable, was few cases with poor quality HDMI cables what isn't supported higher resolutions (the monitor resolution?). Or the power source, I had something similar with my RPi3, when I connected something to RPi, after reboot wasn't had picture. Or TV EDID detection, could you try with another TV? Or after fresh TV setup, when the screen setup is done, try to send thru SSH the "getedid create" command. That will save the TV display parameters (EDID data) and will use it at every startup.