HDMI - Unstable [SOLVED]

Hardware related problems and workarounds

HDMI - Unstable [SOLVED]

Postby SYOUYU » Wed Oct 01, 2014 6:33 am

Hi All,

Parallella can boot now, but displaying through HDMI is not stable.
1. sometime black-out the displaying,
2. displaying size does not fit onto the HDMI display

Too large displaying can not make log-in...
It is probably display issue, has anyone idea to solve it?

Regards,
SYOUYU
Last edited by SYOUYU on Sun Oct 12, 2014 6:22 am, edited 1 time in total.
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Re: HDMI - Unstable

Postby 9600 » Wed Oct 01, 2014 6:59 am

Sounds like a display issue and something that may be resolved by forcing a different resolution:

http://elinux.org/Parallella_Linaro_Nan ... o_1280x720

Regards,

Andrew
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Re: HDMI - Unstable

Postby SYOUYU » Wed Oct 01, 2014 9:18 am

Hi Andrew-san,

I checked the boot after 30min or more from the posting this thread.
Boot did not make the issue, but after 5min, black-out was frequently occurred and resolution issue was also happen.
It seems that a heating is issue, although I use a standard heat-sink.

Is it possible to make the issue by the temperature?

Anyway, USB is also issue now, not working.
I used bus-powered USB-Hub, and removed this hub and directly connected mouse to the board, but did not work
There is many threads about the USB issue, which one is best answer, or is there summarized thread for solution?
--
Best Regards,
SYOUYU
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Re: HDMI - Unstable

Postby SYOUYU » Thu Oct 02, 2014 6:52 am

I use self-powered usb hub now,
it makes possible to use usb peripherals,
so I login to ubuntu on Parallella board.

However, heating issue makes black-out of displaying...
--
Best Regards,
SYOUYU
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Re: HDMI - Unstable

Postby greytery » Thu Oct 02, 2014 7:53 am

SYOUYU wrote:However, heating issue makes black-out of displaying...


Is this a recent Parallella with the Large Heatsink?
Was there a thermal pad included for the HDMI chip as well as the CPU and Epiphany chip - and did you fit them?
If not then perhaps the heating issue of the HDMI chip is because there is no longer any air flow over it, and it has no contact with the heatsink (that I can see).
You might try removing the heatsink and adding thermal paste or pad to the HDMI chip (and replacing the CPU/Epiphany pads) before replacing the heatsink.

If not using the Large Heatsink then my guess is you seem to have a defect. However, try adding a small heatsink to the HDMI chip...

Just a thought. Any comments?

Cheers,
tery
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Re: HDMI - Unstable

Postby SYOUYU » Thu Oct 02, 2014 8:42 am

greytery wrote:
SYOUYU wrote:However, heating issue makes black-out of displaying...


Is this a recent Parallella with the Large Heatsink?
Was there a thermal pad included for the HDMI chip as well as the CPU and Epiphany chip - and did you fit them?
If not then perhaps the heating issue of the HDMI chip is because there is no longer any air flow over it, and it has no contact with the heatsink (that I can see).
You might try removing the heatsink and adding thermal paste or pad to the HDMI chip (and replacing the CPU/Epiphany pads) before replacing the heatsink.

Yes, recent Parallella with a Heatsink, and two thermal pads (seals).
I did not put such pad onto HDMI chip, I understand the issue.
I will buy pad seat and also put onto the chip.

Thanks and Regards,
SYOUYU
--
Best Regards,
SYOUYU
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Re: HDMI - Unstable

Postby SYOUYU » Thu Oct 02, 2014 10:04 am

Anyway, where is the HDMI chip on the board?
--
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SYOUYU
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Re: HDMI - Unstable

Postby greytery » Thu Oct 02, 2014 5:50 pm

The HDMI chip is the square Analog Devices ADV7513 IC next to (below) the Zynq. Look for the 'U26' label on the board.

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tery
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Re: HDMI - Unstable [SOLVED]

Postby SYOUYU » Mon Oct 06, 2014 8:27 am

I removed the thermal pads, and put new pads to epiphany, zynq, hdmi chips.
In addition, I replaced display with new one.
The displayig is stable and does not brinking as black-out.
I write this message with firefox on parallella board.

Thanks and Regards,
SYOUYU
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Re: HDMI - Unstable

Postby aolofsson » Mon Oct 06, 2014 12:13 pm

SYOUYU,
Fantastic to hear! b
tw. How are you situating the Parallella? Flat on the table or standing up on the side?
Andreas
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