Odd Display Problem – Forumite.site

This topic has 16 replies, 4 voices, and was last updated 5 years, 10 months ago by Wheels-Of-Fire.

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May 11, 2020 at 9:48 pm #42990
Wheels-Of-Fire
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@grahamdearsley
Forumite Points: 4
I have a Benq G2420HD monitor that I have just given to my mother but it is now giving a strange problem. About a minute after the Windows desktop appears the screen goes very and dim and when I pull up the monitors menu I find that the brightness has been set to 0%. If I set the brightness back to 50% then it will stay there until I reboot the PC and then it will do the same thing again.

The monitor worked fine on my PC and the only difference I can see is that it was connected via HDMI but it is now using VGA (the PC only HAS VGA).

Any ideas ?
May 11, 2020 at 9:52 pm #42991
Wheels-Of-Fire
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@grahamdearsley
Forumite Points: 4
The other thing I should have mentioned is that the monitor has senseye auto dimming but I have switched that off.
May 11, 2020 at 9:58 pm #42992
Bob Williams
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@bullstuff2
Forumite Points: 0
This: https://tinyurl.com/y7vl9rv2

If you don’t need a long cable, just an adapter to a HDMI cable, This: https://tinyurl.com/ydcpoquu

Lots more like that Graham.

When the Thought Police arrive at your door, think -
I'm out.
May 11, 2020 at 10:17 pm #42993
Wheels-Of-Fire
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@grahamdearsley
Forumite Points: 4
That cable does HDMI to VGA (so it claims) but my Mum’s PC really only has VGA out (not even DVI) so I would need a cable to convert VGA to digital and I don’t know of a passive cable that can do that 😁.

I don’t think that that is the real problem though.
May 11, 2020 at 10:27 pm #42995
Wheels-Of-Fire
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@grahamdearsley
Forumite Points: 4
And I wanted to fit a graphics card too but I can’t because although the motherboard has a 16X pcie slot, the PC uses an external power brick like a laptop and an internal pico PSU with no pcie connectors and a TOTAL output of 150W.
May 12, 2020 at 12:31 am #42996
JayCeeDee
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@jayceedee
Forumite Points: 230
Wheels-Of-Fire wrote:

And I wanted to fit a graphics card too but I can’t because although the motherboard has a 16X pcie slot, the PC uses an external power brick like a laptop and an internal pico PSU with no pcie connectors and a TOTAL output of 150W.

Would one of THESE solve that problem for you, Graham?? with perhaps an adapter to convert from molex to whatever the card specifies. If it needs more than 2A there are bigger, but dearer options.
May 12, 2020 at 7:01 am #42997
Ed P
Participant
@edps
Forumite Points: 39
Sounds like a power saving setting on the TV that needs to be altered.
May 12, 2020 at 3:51 pm #42999
Wheels-Of-Fire
Participant
@grahamdearsley
Forumite Points: 4
The PSU idea is interesting, I would need a Molex to 6 pin PCIe adaptor, but has anyone else tried powering a PCIe card from an external supply ?

I have gone through all the monitors settings and the only power saving option puts the monitor into standby, and its off 😁.

I was wondering if the dimming was something Windows could control ? Normally I would say not, especially over VGA, but when I plugged the monitor in Windows detected its make and model and loaded a new driver for it. On my PC at home this monitor only ever showed up as a generic PnP monitor.

Come to think of it I’m going to try rolling back the driver.
May 12, 2020 at 4:16 pm #43000
Wheels-Of-Fire
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@grahamdearsley
Forumite Points: 4
It is something that Windows is doing. I had a thought before rolling back the driver. You can stare at the login screen for as long as you like and nothing will happen but 45 sec after logging in the screen goes dim.

Any ideas on that ?
May 12, 2020 at 5:39 pm #43001
Bob Williams
Participant
@bullstuff2
Forumite Points: 0
Wheels-Of-Fire wrote:

That cable does HDMI to VGA (so it claims) but my Mum’s PC really only has VGA out (not even DVI) so I would need a cable to convert VGA to digital and I don’t know of a passive cable that can do that 😁. I don’t think that that is the real problem though.

It’s male at both ends Graham, so should work either way. But as you say, and after reading more replies, maybe not the real problem.

When the Thought Police arrive at your door, think -
I'm out.
May 13, 2020 at 8:04 am #43003
Ed P
Participant
@edps
Forumite Points: 39
Maybe your somewhat non-standard cabling is triggering Window’s Adaptive brightness setting. Try turning this off in Windows ‘Power Saving’ (Type Adaptive Brightness into the Search box for instructions)
May 13, 2020 at 12:26 pm #43008
Wheels-Of-Fire
Participant
@grahamdearsley
Forumite Points: 4
Thanks Ed. I do not have the adaptive brightness setting but it got me thinking…

With the correct Monitor driver installed Windows can and dose change the display settings of a Benq Monitor with Senseye, even with it supposedly switched off.

I changed the colour profile from Benq to sRGB and the monitor immediatly changed its brightness setting to 80% and stayed there. But I didn’t like the colours so I changed the monitors display setting from standard to dynamic (that is meant to enable senseye and it disables the display controls for brightness, contrast and colour) and put the Windows colour profile back to Benq.

I now have a nice bright and colourful display that stays that way !
May 13, 2020 at 12:44 pm #43009
JayCeeDee
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@jayceedee
Forumite Points: 230
Wheels-Of-Fire wrote:

The PSU idea is interesting, I would need a Molex to 6 pin PCIe adaptor, but has anyone else tried powering a PCIe card from an external supply ?

Just looked at THIS post on a graphics card forum, he seems to be a go-to guy for any questions on powering graphics cards. He’s also provided links to the various connectors.
May 15, 2020 at 12:25 pm #43016
Wheels-Of-Fire
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@grahamdearsley
Forumite Points: 4
My question with an externally powered PCIe card is really whether it is electrically safe. An eternal SATA HDD would only take its power from an external supply but a PCIe card would draw power from the bus as well. I once had a bad experience connecting two supposedly identical rectifiers in parallel and I don’t want to repeat it 😁
May 15, 2020 at 1:16 pm #43017
JayCeeDee
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@jayceedee
Forumite Points: 230
Couldn’t advise on that, maybe the graphics card guy has had experience of it?? Worth an ask maybe.
May 15, 2020 at 1:41 pm #43018
Wheels-Of-Fire
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@grahamdearsley
Forumite Points: 4
I wouldn’t have thought so. Looks like he just has the same Upgrading and Repairing PC’s book by Scott Mueller that I do 😁
May 15, 2020 at 1:48 pm #43019
Wheels-Of-Fire
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@grahamdearsley
Forumite Points: 4
He often quotes word for word but never gives any credit.
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