No HDMI output but the board is turned on

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Re: No HDMI output but the board is turned on

Postby mahmood » Sat Jun 03, 2017 3:42 pm

Hello again
Still I am not able to see the boot screen and that is a pain because I have stuck at the first step!

I downloaded parabuntu-2016.11.1-hdmi-z7010.img and burn it on a 32GB micro sd card. There is a 100MB boot partition with this content
Code: Select all
I:\>dir
 Volume in drive I is BOOT
 Volume Serial Number is 7841-B5AB

 Directory of I:\

12/15/2016  09:59 AM            16,056 devicetree.dtb
12/15/2016  09:59 AM         4,154,824 uImage
12/15/2016  09:59 AM               101 build-bootfs.log
12/15/2016  09:59 AM         2,083,744 parallella.bit.bin
               4 File(s)      6,254,725 bytes
               0 Dir(s)      98,375,680 bytes free



As I power on the board with external power source, I plugged an HDMI cable only. I mean I didn't connect any network or USB keyboard to the board. I see the green LED turns on and the fan starts to speed at a constant speed.

But the monitor is blank and goes into standby mode.

I really appreciate if someone help to debug. Is the board really normal? How can I test the board itself?

:| :| :| :| :|
mahmood
 
Posts: 29
Joined: Tue Nov 10, 2015 9:26 am

Re: No HDMI output but the board is turned on

Postby adexmont » Sun Jun 04, 2017 7:06 am

Hi,
hope my procedure may help you solving the booting problem :
1) Parallella board have 2 green leds + network port leds (4 led 3 green 1 orange) = if the 2 green leds on the board are not on, but only one , should mean that the boot process is not going well (maybe some mistake in bit.bin file)
2)when you dump the .img file on the sd card the "bs:4M" option looks like a must for me (without it the sd wasn't printed correctly.
3) i dumped first the headless version then overwrite the hdmi version without formatting (that may be useless because dd should overwrite the data but i'm not sure)
4) I dig in the github to retrieve the "correct" (not sure it is correct) .bit.bin file and overwrite / rename on the fat BOOT partition. (https://github.com/parallella/parallella-fpga)
5) i did overwrite the .dtb file from the hdmi version (should be the same but you can check with md5sum)
6) you can test if the board is working by checking the network device list of your router and by checking the ethernet port on parallella board if only the green let is blinking you r not online, if the orange is blinking you should be able to ssh the board. (headless image should run on hdmi version allowing you to access via ssh and (still headless) may work better than hdmi version)

I'm on a 7020 hdmi so the result may not be the same

hope to pointed you in a direction to solve your problem.

Cheers

A
adexmont
 
Posts: 121
Joined: Thu Oct 24, 2013 12:58 pm

Re: No HDMI output but the board is turned on

Postby mahmood » Sun Jun 04, 2017 7:30 am

Thanks for hearing from you. Is it OK to connect the parallella directly to laptop through network cable? Or I have to use a cross cable? Or I have to use a switch in between?


2)when you dump the .img file on the sd card the "bs:4M" option looks like a must for me (without it the sd wasn't printed correctly.


Can you explain that? I didn't understand it..
mahmood
 
Posts: 29
Joined: Tue Nov 10, 2015 9:26 am

Re: No HDMI output but the board is turned on

Postby adexmont » Mon Jun 05, 2017 12:30 pm

dd bs=4M if=pubuntu.img of=/dev/sd* is done (in my case) via an usb adapter tht allow you to use the sd card as a usb pendrive, so without the needs of parallella board.
After that you insert the sd on parallella and boot up.

cheers


A
adexmont
 
Posts: 121
Joined: Thu Oct 24, 2013 12:58 pm

Re: No HDMI output but the board is turned on

Postby mahmood » Wed Jun 07, 2017 11:34 am

Up to now, I think the problem is with powering up the board and not the sd card. I have provided to videos and appreciate if you check them and give me a feedback. I have attached a fan to the board according to the guides.

http://www.mediafire.com/file/rgv1g9chcpmhv6c/vid1.mp4
In vid1, before plugging the power cord to the board, the voltage is about 6V. As I plug the power, the voltage drops to about 2.5V the board LED is off but the fan spins at very low speed. If you see the video, when I unplug the power cable, the fan stops.

http://www.mediafire.com/file/8j645bqvv3nc3o9/vid2.mp4
In vid2, before pluggin the power cable, the voltage is about 11.5V. As I plug it, the voltage drops to about 3.5V. The green LED is on but there is no screen. Again, the fan spins and when I unplug the power, it stops.

BTW, I only see one green LED on the board. Why did you say there are two green LEDs?

What is wrong here?
mahmood
 
Posts: 29
Joined: Tue Nov 10, 2015 9:26 am

Re: No HDMI output but the board is turned on

Postby adexmont » Thu Jun 08, 2017 12:24 pm

Why trying to give 12 V on a device that should work with a low tolerance 5 V ? (6 may be too much anyway, asking for tech confirmation) .

I think you fried the board but can't say exactly what component and how to repair.

Try to ask for repair @ adapteva or just buy another one.

I'm sorry for your board

A
adexmont
 
Posts: 121
Joined: Thu Oct 24, 2013 12:58 pm

Re: No HDMI output but the board is turned on

Postby mahmood » Thu Jun 08, 2017 3:36 pm

!!!!

Couple of things... Isn't there any voltage regulator on the board?! We usually put a simple ans small voltage regulator on a bread board with few things. Why there isn't such thing on a 100$ board?!
Also, why an 6V input power drops to about 2~3V after plugging the cable?

What is the procedure for board raepair?
mahmood
 
Posts: 29
Joined: Tue Nov 10, 2015 9:26 am

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