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From: bp@www.zefox.net
Newsgroups: sci.electronics.repair
Subject: Re: What may cause LCD monitor show image for a moment and then go standby
Date: Sun, 6 Apr 2025 00:01:42 -0000 (UTC)
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RodionGork <rodiongork@github.com> wrote:
>> Most LCD monitors allow entry to configuration menus
> 
> yep, I suggested this too at first, but it doesn't react to buttons
> (except power), hence the suspicion it turns off any image immediately
> (which is confirmed by quick blink of some picture on power up).

Not anwering its own buttons seems like a bad sign. I imagine you've
tried any inputs other than VGA, but if not that'd be my next step.

> 
> As about blue / orange LED - thanks for hint, perhaps we'll figure out
> what is what. It is blue when no video cable is attached and turns
> orange on connecting VGA. But then after startup it again turns blue.
> We'll see...

I've got four Dell monitors, the newest is over ten years old. All use
yellow LEDs for standby mode. 

The behavior you describe is consistent with the monitor not seeing a
signal, though I'd expect to wait for at least a few mminutes before
closing up shop.

Good luck,

bob prohaska