Black Screen when using SDTV out

    Hi folks really desperate for some help on this one as I have no clue.

    So I got a new pi4 and installed the new stable 10.0.2? (or whatever it is). Edited the config to enable SDTV out and select a mode,

    Hooked it all up and got the rainbow test screen that appears for a moment, ah sweet. Then, nothing. Just a black screen, and waiting around doesn't help either. HDMI works fine. Libreelec is running as I can SSH in no problem. Anyone know wtf the problem is?

    Hiya,

    Thanks for the response. Unfortunately this doesn't seem to have worked although it has brought me closer. I now get to the libreelec logo boot screen, and then the screen flashes for a second and goes black. Again, still able to SSH in. I followed all the steps in the linked post

    Edited once, last by rileyav (July 14, 2022 at 12:52 AM).

    Edit this dtoverlay line at config.txt, resulting in this:

    Code
    dtoverlay=vc4-kms-v3d,cma-512,composite=1

    Add this line to the end of config.txt:

    Code
    enable_tvout=1

    Add video=Composite-1:720x480@60ie to the end of your existing boot parameters line (file cmdline.txt, after the "quiet" parameter, separated by a space sign).

    Still no luck unfortunately. this line:

    dtoverlay=vc4-kms-v3d-pi4,composite

    Was put in the distroconfig.txt is this correct? Or do I need to add it to the actual config.txt

    Yeah still no luck. Tried the original line and also the alternative one in config.txt, still just flickers once and then goes black after the libreelec boot screen

    You could remove the interlaced parameter "i" from the cmdline.txt line.

    PS: Check the wiring of linked thread.

    PPS: Downgrading to LE 10.0.1 is also worth a try, because thats the version of the linked thread.

    Tried that and no luck. I'll give the downgrade a go, could you point me towards where I can get the 10.0.1 file please?

    EDIT: ah! working on the 10.0.1 version! Only issue is that the gamma seems really unusually high, everything looks real washed out when compared to running it into the same tv with a HDMI>composite converter. Any idea what that may be?

    Edited once, last by rileyav (July 14, 2022 at 2:03 PM).

    To my knowledge there is no gamma correction by software (for both, composite and HDMI). I would use hardware to fix this: Use an adjustable resistor on the composite video pin.

    Ah, as much as I appreciate the pointers there hardware modification is truly a last resort for me on this one..

    Luckily I have the solution! Install the libreelec 10 nightly, follow the instructions in the thread you linked and it works perfect. Not a clue what the cause was but I am a happy bunny now. Thanks for your assistance

    Thanks haha although I think it has more to do with whoever has fixed the issue I was having with the nightly update. While I'm here I don't suppose you could tell me how to access the home folder (specifically home/pi/) via SSH? The filesystem is different in LE and I'm not at all up on linux anyway so I'm rather lost on what the actual path is