An hdmi-connected 10“ monitor has no display on TX1

A new TX1 board is just received. At present it is only connected to a 10" monitor using HDMI connector and both are powered on, nothing appears on the monitor. How can I verify this board works normal? It is said this board ownes a pre-flashed OS image.

You have two issues. The first is that it isn’t unusual for a monitor to not work, yet have the Jetson fully functional in all other respects.

The second issue is that when the Jetson first arrives it will have a full Ubuntu Linux operating system, but because of the need to accept EULA and complete mixing in the nVidia-specific hardware support files, you have to run a script first to install several drivers. Among those drivers is the video driver used in X11 graphics.

Apparently the default console text mode is not in range of your particular monitor. Text mode works without the nVidia hardware drivers, but the monitor still has to accept the scan rates used. Perhaps graphical mode will work once the install script has been run to put in the hardware drivers needed for graphical mode. More on that further down.

Perhaps another monitor would work in text/console mode, then you wouldn’t care about alternate ways of accessing the Jetson. If not, then you have two ways of accessing the new Jetson. The first method is through serial console (this is the first choice on a misbehaving system…this tends to work even if things are otherwise very broken). See:
http://elinux.org/Jetson/TX1_Serial_Console

The wired network should also be working. It uses DHCP, so your router would show the address assigned. If you have that address, you can use ssh, then login as the default start name and password of user “ubuntu”, pass “ubuntu” (be sure to change the pass if anyone outside of your private network can access this).

Once you have access, you will find the home directory of user ubuntu has a subdirectory, “NVIDIA-INSTALLER”. Within that you would run “sudo ./installer.sh” to complete the driver install (the sudo password by default is also “ubuntu”).

Note that if you flash a Jetson there is a step where “apply_binaries.sh” is run (either directly on command line, or with JetPack help). This step does the same thing as “installer.sh”, and results in the newly flashed Jetson already having those drivers right from the start…so flashing is actually a third way to access for installation completion. Flashing does not guarantee console mode or GUI will work if the monitor settings don’t already work with the Jetson, so it is best to know how to get access when no video is available before spending a lot of time guessing.

The method blow is invalid because the eth port after power-on never blinks. The only way http://elinux.org/Jetson/TX1_Serial_Console will be tried.
" The wired network should also be working. It uses DHCP, so your router would show the address assigned. If you have that address, you can use ssh, then login as the default start name and password of user “ubuntu”, pass “ubuntu” (be sure to change the pass if anyone outside of your private network can access this). "

If you have serial console it should be possible to log output at the moment of powering up. Is there a boot log you can post?

I wanna first confirm if the target JTX1 can work sufficiently as long as the TTL-232R-3V3 cable is connected directly between J17 6-pin UART header and linux host.

J17 is not serial console. J17 is associated with the camera. However, should you need communications with J17, that cable you mention should work.

Thanks for your reply. so far, I do need the only way of serial console J21 to look into the JTX1. How is the J21 pins’ numbering? Is it right as below? If not, can you tell me the right numbering?

–±----------------------------------------------------+
–±----------------------------------------------------+
–±—2-4-6-8-10--------------------------36–40-----+
–±—±±±±±±±±±±±±±±±±±±±±----J24
–±—±±±±±±±±±±±±±±±±±±±+
–±—1-3-5-7-9---------------------------35–39
-J14–J21

The ‘+’ signes above mark pins. J14, J21 and J24 are lined up along the same side. please ignore these ‘-’ signes.

Viewed from above, your diagram is correct. On the silk screen you may notice a tiny triangle marking pin 1 (which is the pin closest to board edge and simultaneously closest to the power button).

As per your guide, the JTX1 works ok now.
Thx

:)