please provide a link to the screen, as I see no entries for the screen in your userconfig.txt
Please connect to Volumio via SSH and post the result of
cat /boot/userconfig.txt
Which DSI port of the Pi is the display connected to (DSI0 or DSI1)?
that’s already in the posted log:
# cat /boot/config.txt ---------------
### DO NOT EDIT THIS FILE ###
### APPLY CUSTOM PARAMETERS TO userconfig.txt ###
initramfs volumio.initrd
gpu_mem=128
gpu_mem_256=32
gpu_mem_512=32
gpu_mem_1024=128
max_usb_current=1
[pi5]
usb_max_current_enable=1
[all]
include volumioconfig.txt
include userconfig.txt
# cat /boot/userconfig.txt ---------------
# Add your custom config.txt options to this file, which will be preserved during updates
@Wheaten Thanks for the hint!
@Piteros If the display is connected to DSI1 add
dtoverlay=vc4-kms-dsi-7inch
to “/boot/userconfig.txt”.
In case the display should be connected to DSI0 add
dtoverlay=vc4-kms-dsi-7inch,dsi0
to “/boot/userconfig.txt”.
After that reboot.
Hello
Thank you in advance for your willingness to help. I need a few minutes to provide a set of information regarding my problem.
DSI1
Volumio ver 3.742
Touch Display 3.5.0
Pi5 and this LCD works without any problems when I insert another SD card from RoPieee.
Thanks for the additional information.
Please try adding
dtoverlay=vc4-kms-dsi-7inch
to “/boot/userconfig.txt”.
You can do that by execting
echo dtoverlay=vc4-kms-dsi-7inch >> /boot/userconfig.txt
I added
dtoverlay=vc4-kms-dsi-7inch to userconfig.txt
LCD still not working.
Did you reboot?
Yes
And the second time I even turned off the power.
And still no boot logo?
Just to be sure, I reinserted the SD card from RoPieee and it works without any problems.
Display dark from the moment the power is turned on with the Volumio SD card
Nothing is displayed during boot or later. Not even the LED display backlight turns on, it’s black.
According to Waveshares wiki:
Add to /boot/userconfig.txt
dtoverlay=vc4-kms-v3d
dtoverlay=vc4-kms-dsi-7inch
Please post the result of
sudo i2cdetect -y 4
IMHO this should not be required as
dtoverlay=vc4-kms-v3d-pi5
should already be part of “/boot/volumioconfig.txt” - but wouldn’t hurt either. 
I did.
dtoverlay=vc4-kms-v3d
dtoverlay=vc4-kms-dsi-7inch
It didn’t help.
/boot$ sudo i2cdetect -y 4
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: – – – – – – – – – – – – –
10: – – – – – – – – – – – – – – – –
20: – – – – – – – – – – – – – – – –
30: – – – – – – – – – – – – – – – –
40: – – – – – UU – – – – – – – – – –
50: – – – – – – – – – – – – – – – –
60: – – – – – – – – – – – – – – – –
70: – – – – – – – –
Is this the intended result?