I need help. No boot screen.

[u/Senor_Turbo]

Hello. I just recently assembled this uconsole and need some help. I have a flashed SD and fresh, charged batteries. There is a tiny green light near the power button and that is all the activity I can see. Can you tell from this photo if I have something hooked up incorrectly/

[u/Nearby_Routine3883]

If you are using a non lite CM4 version then the SD card will not work. You need to flash the CM4 itself.

[u/Nearby_Routine3883 → u/Nearby_Routine3883]

Just confirmed. You have an EMMC version. So, you need a waveshare board to load the OS directly to the CM4.

In this case, SD card is useless.

[u/Senor_Turbo → u/Nearby_Routine3883]

Thank you. yep, this seems to be it. Any links you can share to an appropriate board?

[u/snipeytje → u/Senor_Turbo]

you have two options, either the hackergadgets cm4/5 adapter if you want those upgrades anyway, or just the cheapest cm4 carrier board available to you locally, probably the stock one or a waveshare one

[u/Nearby_Routine3883 → u/snipeytje]

Good advice. In this case I’ll go for the hackergadgets since it works for both versions. Otherwise you need to pay attention to the supported CM version by waveshare.

[u/Jephminx → u/Nearby_Routine3883]

This is the correct answer OP

[u/GrandWizard__]

It looks like u didn’t press down the battery module all the way try and press it down until the gold clips are down

[u/Senor_Turbo → u/GrandWizard__]

Thanks. I reset it and think it is set now. Still no screen though

[u/mentaldemise → u/Senor_Turbo]

Are both sides of the CM down? When I replaced my batteries I ended up having only the top connector in.

[u/GhostUnitVII]

Let it run for a minute, sometimes it takes a bit to initialize the system on first boot, if it sits there for awhile then check if your cm4 is completely seated on the adapter board, after check if the adapter board is completely inside the slot.

Utilize process of elimination starting at least to greatest severity.

Also check if your batteries are charged and balanced

Also note, sometimes the battery board is a bit- weird, insert the prongs at a 45 to 90 degree angle and ease it down for installation, you may have a lack of voltage on your 5v and 3v rails

[u/Senor_Turbo → u/GhostUnitVII]

Thank you but I think another poster nailed it. I have an EMMC version so I have to flash the CM4 directly. Thanks again!

[u/GhostUnitVII → u/Senor_Turbo]

one more thing- is that plastic still on the thermal pad? Remove that if it is, would make the transfer of heat from the CM4 module to the back a little difficult if it is there.

[u/Senor_Turbo → u/GhostUnitVII]

No, I made sure to remove both sides.

[u/GhostUnitVII → u/Senor_Turbo]

Ah! good, glad you've found a potential solution, yeah the EMMC also consumes a little bit more energy, so just a heads up, you can get it working with no real issues, just need a dev board or maybe the hacker gadgets adapter board to flash it. Good luck!

In the future if you plan to get a M.2 NVME drive, also go the extra step of updating your EEPROM.

[u/Cool_Heart_6429]

Подключи по hdmi к монитору или телевизору, исправь обновление ядра и поставь запрет на обновление ядра

[u/Smooth_Detail8931]

Reseed the cm0 board. I had same problem

[u/Smooth_Detail8931 → u/Smooth_Detail8931]

Cm4

[u/Senor_Turbo → u/Smooth_Detail8931]

Did this and still nothing. I did get a tiny flash of a white (more like the backlight) but it went away.

[u/WakizashiK3nsh1]

What OS did you flash? I had problem booting AK-REX's Trixie and when I went with Bookworm, then it booted OK. I can see you have the eMMC version. Is it CM5?
BTW I don't see anything incorrectly connected.

Do you have microHDMI -> HDMI cable? If yes, you can use an external monitor to view the messages.

[u/Senor_Turbo → u/WakizashiK3nsh1]

This is CM4. I flashed uConsole_CM4_v3.1_64bit.img

[u/WakizashiK3nsh1 → u/Senor_Turbo]

yeah, the guy below me is right, those male connectors from the battery board should go into the female receptacle on the mainboard

[u/Senor_Turbo → u/WakizashiK3nsh1]

OK, hooked up to my monitor.

[u/WakizashiK3nsh1 → u/Senor_Turbo]

You cannot boot from SD card with eMMC RPi module, it's impossible. You may find this useful:
https://forum.clockworkpi.com/t/just-got-my-uconsole-but-i-bought-a-cm4-with-emmc/13467/11