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CubieTruck won't feed my monitor (HDMI/VGA), either (NAND/SD)

Started by KevinCain, May 03, 2014, 01:49:46 pm

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I've just set up a CubieTruck for the first time, but am having problems with the display.

1.  Booting from NAND, I initially saw the Android logo for a few seconds but then the monitor reported 'no input' on either VGA or HDMI.

2.  Booting with the Cubiuntu flashed to microSD, I see 'no input' from power on.

3.  Even more strangely, after removing the SD card to boot from NAND again, now I do NOT see the Android logo any longer.  It's 'no input' from power on, as with the SD boot.

A few clues:

- In all cases, the LEDs on the Cubie are flashing to indicate that it is booting, just not feeding the display.

- I'm using an ASUS VS228H-P 1920x1080 native 22" monitor (http://www.amazon.com/gp/product/B005BZNDOO/ref=oh_details_o00_s02_i00?ie=UTF8&psc=1).

- I'm powering the Cubie with a 5v, 1A iPad power supply to feed the USB->power cable but have the same results with other 5v power supplies.

Thanks for any insights!


Perhaps the power source may be not sufficient for CT:
QuoteNovember 21, 2013 at 1:22 am   
What will the power requirements be? How much power does the board draw when idle?

   ahha lee says:   
November 22, 2013 at 5:00 pm   
5V@2A at least with a 2.5 inch HDD. Usually it costs 600mA.

Also after booting from SD with Linux, NAND gets corrupted for Android:

If you have to reinstall Android on NAND follow these directions:

But use this image instead:


Thanks actkk2000 for your suggestion.  I'd considered that the 1A supplies were under-powered -- I'll test with 2A supplies and post my results.  If power was the issue I don't see why I'd be able to see the Android logo on initial NAND boot and the LEDs pulse happily while power is connected.  It really seems that the CT is booting, but not feeding the display.


I've swapped out the power supply for a 5v 3A unit.  W=v*a, so this is 15w.

The CT acts the same as with the 5v 1A power supply:  I get LED lights, but no VGA or HDMI signal.

Next I'll try another distro and report back.


To try to get my CT to connect to a monitor over VGA or HDMI,  I swapped distros from Cubiuntu (http://www.cubieforums.com/index.php?topic=568.0) to Cubieez (https://drive.google.com/file/d/0B4b_-NVoml34ZVZlRFhGRkRwNm8/edit?usp=sharing) via a micoSD card imaged with win32DiskImager.

Unfortunately while the CT seems to boot into Cubieez judging from the blinking LEDs, I still cannot get any video out via VGA or HDMI.  I have no trouble connecting to the (new) monitor from a win7 laptop using either VGA or HDMI.

Having already eliminated power supplies as a potential problem (above), I'm out of ideas for what is wrong.

Can anyone else confirm similar problems with the CT?  Has anybody found there are hardware problems with some CT boards?  Thanks...


At last, I managed to boot the CT.  I found that if I power down with a (very) long press of the power switch, then on with a quick press, the CT will boot from microSD and connect with the monitor.

Hopefully this basic point could help other beginners.

To close the thread, I confirmed that the CT will boot with 5v 1A power supply.


Good to know!
But it seems Android on NAND got corrupted... :o sry



I have a brandnew cubietruck3 and I connected keyboard/mouse/ethernet cable and connect it to
my vga monitor. I am powering it using a 2.1A USB adapter.

When I power it on, I see the android logo. I see it has obtained an IP address (from my router).
The screen goes dark after a while.

I don't see anything after that.

I connected it to my television and used HDMI instead of VGA. Now, I see that on poweron the CT3
logo shows, but the screen flickers.

I have not used any custom image. I have no clue as to why my monitor does not work.

Also, I tried to access using the default username/password, but I could not get in. I could ping the
CT3 IP (as indicated by my router dhcp though). What is the out of box username/password and is
ssh enabled by default? Or do I have to use telnet?