Hello gurus,
I picked up an HDMI 8" IPS LCD Screen Kit (1024x768) fairly recently and used it with my Pi 4 for about a week successfully. After that, I was getting a “No Signal” message on the screen after booting (it would turn on though when booting). After a number of tests and sadly no other HDMI screen to cross-check with, I decided to get a Pi 5 as that was on my list and give that a shot. I’m getting the same results.
However, I WAS able to boot and access the desktop once, so I know I’m close to something good. May I trouble you to help me troubleshoot? :)
The Pi 5 was installed with the Raspberry Pi Installer from a PC, Raspberry Pi OS 64-bit.
I added these settings to config.txt (which may need to stay, change or go):
# CUSTOM display
hdmi_force_hotplug=1
hdmi_group=1
hdmi_mode=16
config_hdmi_boost=4
Here’s the whole config:
# For more options and information see
# http://rptl.io/configtxt
# Some settings may impact device functionality. See link above for details
# Uncomment some or all of these to enable the optional hardware interfaces
dtparam=i2c_arm=on
dtparam=i2s=on
dtparam=spi=on
# Enable audio (loads snd_bcm2835)
dtparam=audio=on
# Additional overlays and parameters are documented
# /boot/firmware/overlays/README
# Automatically load overlays for detected cameras
camera_auto_detect=1
# Automatically load overlays for detected DSI displays
display_auto_detect=1
# Automatically load initramfs files, if found
auto_initramfs=1
# Enable DRM VC4 V3D driver
dtoverlay=vc4-kms-v3d
max_framebuffers=2
# Don't have the firmware create an initial video= setting in cmdline.txt.
# Use the kernel's default instead.
disable_fw_kms_setup=1
# Run in 64-bit mode
arm_64bit=1
# Disable compensation for displays with overscan
disable_overscan=1
# CUSTOM display
hdmi_force_hotplug=1
hdmi_group=1
hdmi_mode=16
config_hdmi_boost=4
# Run as fast as firmware / board allows
arm_boost=1
[cm4]
# Enable host mode on the 2711 built-in XHCI USB controller.
# This line should be removed if the legacy DWC2 controller is required
# (e.g. for USB device mode) or if USB support is not required.
otg_mode=1
[all]
The screen is neatly mounted to the box it shipped in using elastic cording (work in progress…). The ribbon connected to the screen does a 180 degree wrap where the ribbon is connected to the screen controller mounted on the back side. I tried removing and plugging that ribbon in again so far. It looks straight.
I tried disconnecting and reconnecting the HDMI cable on both ends, and the HDMI to [micro HDMI?] adapter where the Pi connects. This is honestly my biggest suspicion now (try new cable and adapter?)
HDMI is connected to the Pi’s HDMI port closest to the power source.
After doing all that while writing this post (don’t want to waste your time!), I now boot and see a black screen (no “no signal” message) for about 10 seconds before it turns back off.
Before I go buy a replacement cable, would you have any other ideas on what might be happening?
Thanks for taking a look in advance!
Best regards,
Chris