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Monitor Problem???

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  Monitor Problem??? "Stephen P. Molnar" <s.molnar@sbcglobal.net> - 2021-01-03 13:00 +0100
    Re: Monitor Problem??? Georgi Naplatanov <gosho@oles.biz> - 2021-01-03 13:20 +0100
    Re: Monitor Problem??? "hdv@gmail" <hdv.jadev@gmail.com> - 2021-01-03 13:30 +0100
    Re: Monitor Problem??? "Alexander V. Makartsev" <avbetev@gmail.com> - 2021-01-03 13:30 +0100
    Re: Monitor Problem??? Andrei POPESCU <andreimpopescu@gmail.com> - 2021-01-03 15:10 +0100
    Re: Monitor Problem??? Gene Heskett <gheskett@shentel.net> - 2021-01-03 16:50 +0100
    Re: Monitor Problem??? David Wright <deblis@lionunicorn.co.uk> - 2021-01-03 17:40 +0100
      Re: Monitor Problem??? "Stephen P. Molnar" <s.molnar@sbcglobal.net> - 2021-01-03 17:50 +0100

#230281 — Monitor Problem???

My main computer runs  Debian Buster and is displaying some unusual 
behavior.

The monitor is blanking, without warning, at random times, and restoring 
the screen  while I working. There is no warning, nor does the computer 
seem to be overheating (I continuously monitor the temperature).

I rather suspect that it may be a hardware problem. I keep the software 
up to date.

I am querying this group because I can't think of a more knowledgeable 
source. Any thoughts and suggestions of things that I might be able to 
test will be very welcome.

Thanks in advance.

-- 
Stephen P. Molnar, Ph.D.
www.molecular-modeling.net
614.312.7528 (c)
Skype:  smolnar1

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#230282

On 1/3/21 1:58 PM, Stephen P. Molnar wrote:
> My main computer runs  Debian Buster and is displaying some unusual
> behavior.
> 
> The monitor is blanking, without warning, at random times, and restoring
> the screen  while I working. There is no warning, nor does the computer
> seem to be overheating (I continuously monitor the temperature).
> 
> I rather suspect that it may be a hardware problem. I keep the software
> up to date.
> 
> I am querying this group because I can't think of a more knowledgeable
> source. Any thoughts and suggestions of things that I might be able to
> test will be very welcome.
> 

Hi Stephen,

what kind of computer is yours - desktop or notebook?

In case it's a notebook what is exact model?

In case it's a desktop computer, what is the video card and which video
drivers are you using?

Kind regards
Georgi

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#230283

On 2021-01-03 12:58, Stephen P. Molnar wrote:
> My main computer runs  Debian Buster and is displaying some unusual 
> behavior.
> 
> The monitor is blanking, without warning, at random times, and restoring 
> the screen  while I working. There is no warning, nor does the computer 
> seem to be overheating (I continuously monitor the temperature).
> 
> I rather suspect that it may be a hardware problem. I keep the software 
> up to date.
> 
> I am querying this group because I can't think of a more knowledgeable 
> source. Any thoughts and suggestions of things that I might be able to 
> test will be very welcome.

I suspect it is a software problem, not a hardware problem. The reason 
is I have been seeing the same for almost a year now with my display. I 
can't find anything that indicates a hardware problem and after all this 
time the display/monitor is still trucking on without the problem 
getting any worse.

I am not 100% sure, but it seems like sometimes the display is put into 
sleep mode and can't be woken up. Restarting X or doing a modprobe from 
a remote machine over ssh doesn't help. Nor does anything else. The only 
way to get the monitor to activate again is to reboot. After some 
digging I gave up on finding the root cause and accepted that I'd have 
to reboot once in a while. There is nothing in the logs to give any 
indication of a possible cause. Maybe I should have tried harder, but I 
just don't have the time for that at the moment.

FYI, this is the relevant hardware in my system:

MoBo = ASUS PRO WS X570-ACE
CPU = AMD Ryzen 9 3950X
Graphics = ASUS AREZ-RX560-4G-EVO

Debian version is Bullseye following testing very closely.

Sorry I can't help you with this.

Grx HdV

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#230284

[Multipart message — attachments visible in raw view] — view raw

On 03.01.2021 16:58, Stephen P. Molnar wrote:
> My main computer runs  Debian Buster and is displaying some unusual 
> behavior.
>
> The monitor is blanking, without warning, at random times, and 
> restoring the screen  while I working. There is no warning, nor does 
> the computer seem to be overheating (I continuously monitor the 
> temperature).
>
> I rather suspect that it may be a hardware problem. I keep the 
> software up to date.
>
> I am querying this group because I can't think of a more knowledgeable 
> source. Any thoughts and suggestions of things that I might be able to 
> test will be very welcome.
>
> Thanks in advance.
>
What is model\make of the monitor? For how long was it in service?
Does it have a power led indicator? Does it change color from green 
(normal mode) to yellow (standby mode) during blanking?
Does it have an internal or external PSU?

 From the description it sure does look like the monitor is the culprit 
and it is hardware problem.
I'd suspect dried out electrolytic capacitors on power lines. They need 
to be inspected and replaced with a new ones.
Or it could be flaky ribbon cable connections between internal PCBs 
and\or LCD. In this case you need to clean contacts of the cables with 
rubbing alcohol. Let them to dry out completely, before reassembling 
monitor.

-- 
With kindest regards, Alexander.

⢀⣴⠾⠻⢶⣦⠀
⣾⠁⢠⠒⠀⣿⡁ Debian - The universal operating system
⢿⡄⠘⠷⠚⠋⠀ https://www.debian.org
⠈⠳⣄⠀⠀⠀⠀

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#230287

[Multipart message — attachments visible in raw view] — view raw

On Du, 03 ian 21, 06:58:24, Stephen P. Molnar wrote:
> My main computer runs  Debian Buster and is displaying some unusual
> behavior.
> 
> The monitor is blanking, without warning, at random times, and restoring the
> screen  while I working. There is no warning, nor does the computer seem to
> be overheating (I continuously monitor the temperature).

Make sure the cables are properly connected, at both ends.

Kind regards,
Andrei
-- 
http://wiki.debian.org/FAQsFromDebianUser

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#230291

On Sunday 03 January 2021 06:58:24 Stephen P. Molnar wrote:

> My main computer runs  Debian Buster and is displaying some unusual
> behavior.
>
> The monitor is blanking, without warning, at random times, and
> restoring the screen  while I working. There is no warning, nor does
> the computer seem to be overheating (I continuously monitor the
> temperature).
>
That has the marks of an older, ccfl backlit, screen with either the 
flourescent tube or its power supply caps, on the way out. If, when the 
back has been removed, you see some alu cans with plastic film printed 
wrappers, and the tops are bulged out, they'll need to be replaced by 
suitable very low ESR replacements. But that will generally need a full 
blown soldering station ($100 and up) and some expertise at soldering.  
If you have both, piece of cake, if not, take it to someone who does, or 
replace it. Modern led backlit monitors are generally brighter and use 
less power.

If that someone has a CET plaque on the wall like I do, that's a definite 
plus.

> I rather suspect that it may be a hardware problem. I keep the
> software up to date.
>
> I am querying this group because I can't think of a more knowledgeable
> source. Any thoughts and suggestions of things that I might be able to
> test will be very welcome.
>
> Thanks in advance.

Cheers, Gene Heskett
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
If we desire respect for the law, we must first make the law respectable.
 - Louis D. Brandeis
Genes Web page <http://geneslinuxbox.net:6309/gene>

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#230292

On Sun 03 Jan 2021 at 06:58:24 (-0500), Stephen P. Molnar wrote:
> My main computer runs  Debian Buster and is displaying some unusual
> behavior.
> 
> The monitor is blanking, without warning, at random times, and
> restoring the screen  while I working. There is no warning, nor does
> the computer seem to be overheating (I continuously monitor the
> temperature).
> 
> I rather suspect that it may be a hardware problem. I keep the
> software up to date.
> 
> I am querying this group because I can't think of a more knowledgeable
> source. Any thoughts and suggestions of things that I might be able to
> test will be very welcome.

What sort of connection do you have between the computer and the
monitor? We have an HP Spectre that developed an unreliable HDMI
socket within 27 months. The symptoms were as you described.
Being a laptop, the cure was to run the display through the
USB-C port with a hub (dual HDMI, ethernet, dual USB3).

OTOH the worst I've experienced with VGA was flickering colour
balance from dirty/worn pins.

Cheers,
David.

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#230293

On 01/03/2021 11:39 AM, David Wright wrote:
> On Sun 03 Jan 2021 at 06:58:24 (-0500), Stephen P. Molnar wrote:
>> My main computer runs  Debian Buster and is displaying some unusual
>> behavior.
>>
>> The monitor is blanking, without warning, at random times, and
>> restoring the screen  while I working. There is no warning, nor does
>> the computer seem to be overheating (I continuously monitor the
>> temperature).
>>
>> I rather suspect that it may be a hardware problem. I keep the
>> software up to date.
>>
>> I am querying this group because I can't think of a more knowledgeable
>> source. Any thoughts and suggestions of things that I might be able to
>> test will be very welcome.
> What sort of connection do you have between the computer and the
> monitor? We have an HP Spectre that developed an unreliable HDMI
> socket within 27 months. The symptoms were as you described.
> Being a laptop, the cure was to run the display through the
> USB-C port with a hub (dual HDMI, ethernet, dual USB3).
>
> OTOH the worst I've experienced with VGA was flickering colour
> balance from dirty/worn pins.
>
> Cheers,
> David.
>
>
The monitor is hardwired to a switch that, in turn, is hardwired to my 
main Linux Platform and an older Linux computer.

Rebooting the system seems (at least, so far) to  have remediated the 
problem.

Many thanks for your reply. I knew I could rely on the mailing list.

-- 
Stephen P. Molnar, Ph.D.
www.molecular-modeling.net
614.312.7528 (c)
Skype:  smolnar1

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