I've bought a month ago a new Raspberry Zero to try this little toy. I'm already playing with a Raspberry and linux OS in general but this time i'm very close to give up. The problem is that this Raspy won't display boot messages, this is what i've tried:
- 16gb with NOOBS v1.5.0 image (boots on pi2)
- Same 16gb card with raspian jessie image (2015-11-21 and also this boots on pi2)
- Old 8gb SD from pi2 with jessie raspian ( this give 7 green led flashes )
- .txt file to force HDMI hotswap and other commands video-related (copied below)
- HDMI to DVI cable
- HDMI to HDMI cable (actually I've tried 2 of them)
- Different monitor or TV
- With or without micro USB to female Usb adapter to connect a keyboard
here is my config.txt:
# For more options and information see # http://www.raspberrypi.org/documentation/configuration/config-txt.md # Some settings may impact device functionality. See link above for details # uncomment if you get no picture on HDMI for a default "safe" mode #hdmi_safe=1 # uncomment this if your display has a black border of unused pixels visible # and your display can output without overscan #disable_overscan=1 # uncomment the following to adjust overscan. Use positive numbers if console # goes off screen, and negative if there is too much border #overscan_left=16 #overscan_right=16 #overscan_top=16 #overscan_bottom=16 # uncomment to force a console size. By default it will be display's size minus # overscan. #framebuffer_width=1280 #framebuffer_height=720 # uncomment if hdmi display is not detected and composite is being output hdmi_force_hotplug=1 # uncomment to force a specific HDMI mode (this will force VGA) #hdmi_group=1 #hdmi_mode=1 # uncomment to force a HDMI mode rather than DVI. This can make audio work in # DMT (computer monitor) modes hdmi_drive=2 # uncomment to increase signal to HDMI, if you have interference, blanking, or # no display #config_hdmi_boost=4 # uncomment for composite PAL #sdtv_mode=2 #uncomment to overclock the arm. 700 MHz is the default. #arm_freq=800 # Uncomment some or all of these to enable the optional hardware interfaces #dtparam=i2c_arm=on #dtparam=i2s=on #dtparam=spi=on # Uncomment this to enable the lirc-rpi module #dtoverlay=lirc-rpi # Additional overlays and parameters are documented /boot/overlays/README # Enable audio (loads snd_bcm2835) dtparam=audio=on # NOOBS Auto-generated Settings: hdmi_force_hotplug=1 config_hdmi_boost=4 overscan_left=24 overscan_right=24 overscan_top=16 overscan_bottom=16 disable_overscan=0
In general I can see the green led acting as a status led when is loading but no HDMI output is showing on monitor.
I hope to have been detailed as possible, unfortunately with mi first RPi B and the RPi 2 i've never issued this kind of problem.
Here is the video of the problem, for the full time the monitor still black with no signal alert: Video link
Thanks in advance!
I tried to connect the UART to my USB to ttl converter during boot and now I can see all mesages and login prompt. Seems working ok but still no HDMI output. I alredy tried to tweak the output with all available mode on tvservice command but both my monitor and my tv shows no signal.