Etson Nano HDMI Display Issue and UART Debugging Preparation

[bbiyakei]

Hello, I am currently experiencing an issue with my Jetson Nano, and I would appreciate any assistance from the community.

1. Issue Description:

• The Jetson Nano powers on (green light on the board is visible), but there is no output on the HDMI display.
• I followed the official guide to flash the OS onto an SD card using balenaEtcher.
• I tested with multiple HDMI cables and monitors, but the issue persists.

2. Steps Taken:

• Verified the power supply: I am using a 5V 4A DC adapter.
• Re-flashed the SD card with the latest Jetson Nano image.
• Tested with two monitors and three HDMI cables.

3. Next Steps:

• I have ordered a USB to TTL adapter (FT232-based) to capture UART logs and debug further.
• I plan to connect the adapter to the Jetson Nano’s UART pins and use a terminal software to analyze the boot logs.

Before the USB to TTL adapter arrives, I wanted to ask:

• Are there any other troubleshooting steps I can try in the meantime?
• Once I capture the UART logs, what specific information should I look for to identify the issue?

Thank you for your time and support!

[WayneWWW]

balenaEtcher does not really reflash the board. If you want a true reflash, find another ubuntu 18.04 x86 host PC and use sdkmanager to flash your Jetson from it through micro usb.

[linuxdev]

I will add some information: The SD card model of Jetsons which don’t have eMMC put the operating system on the SD card. However, there is QSPI memory on the module itself, and that content is the equivalent of a BIOS plus a boot chain. The QSPI must be flashed once with the same major release of the L4T used in the creation of the SD card. If that QSPI is L4T R35.x and your SD card is L4T R36.x, then I would expect failure to boot.