Don't have HDMI output

[die.ga]

Hi all,

I have a new Rasbpery Pi 4 and does not matter if I use Noobs, Recalbox, Lakka or Batocera, the TV popup with a 640x480 and then nothing happens.

Sometimes show an image - still in 640x480 - and then goes black again.

Anyone had this problem too?

Thanks!

[aBUGSworstnightmare]

You don't provide information on your display in use. Do you know which reolution it is supporting?

As VGA seems unsupported you need to try with another resolution to get it running , or use SSH and do the troubleshoot guide (what modes are supprted) described here https://www.raspberrypi.org/documentati ... -config.md

Start with Raspbian to figure this out, and then move to your target OS once you know valid settings.

[die.ga]

Hi!,

Thanks for your reply.

Same problems with Raspbian, I am using an AOC TV 32" FULLHD.

Any idea ?

Thanks!

[HawaiianPi]

This is likely caused by an error in the TV's EDID data (or a bad uHDMI adapter).

Try add the following to config.txt (located on the small FAT32 "boot" partition of a Raspbian imaged card).

hdmi_force_hotplug=1
hdmi_ignore_edid=0xa5000080
hdmi_group=1
hdmi_mode=16

Which tells the Pi to ignore the EDID data and just try 1080p60 CEA mode (full-HD television).

Also, use the HDMI-0 port (closest to the USB-C power input).


See here for more config.txt HDMI info:
https://www.raspberrypi.org/documentati ... t/video.md

[die.ga]

Hi!,

Is the TV as you say, I tried with a Samsung Monitor and works as expected.

I tried with:

hdmi_force_hotplug=1
hdmi_ignore_edid=0xa5000080
hdmi_group=1
hdmi_mode=16

But same error.

The TV is an AOC 43", that worked perfectly with a Rasbperry PI 3B+.

Any idea?

Thanks again!

[FTrevorGowen]

Hi!,

Is the TV as you say, I tried with a Samsung Monitor and works as expected.

I tried with:

hdmi_force_hotplug=1
hdmi_ignore_edid=0xa5000080
hdmi_group=1
hdmi_mode=16

But same error.

The TV is an AOC 43", that worked perfectly with a Rasbperry PI 3B+.

Any idea?

Thanks again!

Can you still use the AOC TV with the P3B+ ? If so try using the uSDHC card from the P4B (or installing Buster on another uSDHC card) and, assuming you still get a display, post the output of these tvservice commands:

Code: Select all

tvservice -n
tvservice -m CEA
tvservice -m DMT
tvservice -s

From the info. that (should) produce we may be able to suggest a display mode to "force" in config.txt that may work. Some T.V.'s generate edid data that does not parse well.
Trev.

[die.ga]

Hi!,

I don't have the P3B+ anymore .

Thanks for your help again.

[LTolledo]

what is the native resolution of the 43" AOC monitor you have?

[FTrevorGowen]

Hi!,

I don't have the P3B+ anymore .

Thanks for your help again.

O.K. If you haven't done so already can you enable SSH (and networking)? This will be easier if you temporarily use the Samsung monitor. (If you can't do that see: https://www.raspberrypi.org/documentati ... /README.md ) It may also be worth enabling boot to command line only. Swap back to the problem TV, and boot up, SSH in from another computer (eg. via PuTTY) and then run those commands remotely.
Trev.

[RaspbianUser1]

I had the same issue on my Pi 4b im pretty sure,
try going to the NOOBS and editing the config line
#hdmi_group=1
#hdmi_mode=1

to
hdmi_group=1
hdmi_mode=1

(just remove the # to force the command)

Also something that was a slight fix is, after it goes to that no signal screen, switch the HDMI from 0 to 1, then wait like 5 seconds, then HDMI 1 to 0, this will hopefully let you use your pi if my other suggestion doesn't help

[die.ga]

Hi all!,

Also something that was a slight fix is, after it goes to that no signal screen, switch the HDMI from 0 to 1, then wait like 5 seconds, then HDMI 1 to 0, this will hopefully let you use your pi if my other suggestion doesn't help

That works for me!

The only problem is that the resolutions is still in 640x480.

I already tried to change hdmi_group=16 but the problem persists with the resolution.

Any idea?

Thanks again!