jamesh wrote: ↑
Wed Apr 22, 2020 7:34 am
You should not need to make any changes to config.txt to get HDMI out, so remove anything you have changed, then retry. If it doesn't work, then the Pi is probably broken, and needs to be replaced under warranty.
Assuming a correctly imaged card, if it doesn't work out of the box, with multiple different and standard devices, there's nothing that can be done. All warranties are with the seller.
i returned the Pi to the seller, and they reported that they simply plugged the Pi in with an image of NOOBS and the video worked perfectly. they offered to send it back, but specified that i wouldn't be able to return it if i encountered more problems, so i just got a refund.
a week later i ordered a new RP4 from a different vendor, and - again - i have NO video.
same exact symptoms as before... the Pi boots normally and functions normally over the network, but refuses to push video.
i've dug my old flat screen TV out, which lets me plug the micro-HDMI in directly, without any extension cable or adapter, and still nothing.
i pulled the microSD card out, plugged it into my RP0w, and the Pi0w works perfectly with the screen.
the only possible culprit is the HDMI cables... but i've got two new ones from two different vendors, and it seems hugely unlikely they would both fail while still working sufficiently to let the RP4 identify the screen. i bought a Rankie micro-HDMI cable, and there are lots of reviews of people using it with RP4b's.
is my only option to keep buying micro HDMI cables ? am i just too dumb to get a RP4 to send video ??
the odds of two bad RP4's which only fail to push video, seems impossibly low. as does the odds of two quasi-failed HDMI cables.
i'm at a loss. is there any command line options i could perform over the network to do a HDMI cable test with the RP4 ?