From: "stellite" <1newsATstelliteDOTmailshellDOTcom>
Subject: Re: Urgent help needed to blank monitor
Date: Mon, 4 Nov 2002 19:25:25 -0500
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How about changing the Windows logo screen to a different logo for your
customer or an all black picture.
Or a simple timer that turns the monitor on after the system is fully
booted. Maybe 20 seconds. A 555 timer with a relay could do this I believe.
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"Ulrich Peters" wrote in message
> I need assistance from somebody with knowledge in electronics. I am a
> programmer, and I am facing a problem which is a little too much for me.
> I worked in electronics (and even started coursing electronic
> engineering) in the past, but I changed my course to information
> I wrote a program, which run in a customized PC, using a customized
> keyboard, in a kiosk-like box. The software runs just fine, but now the
> company I wrote that product for, requires that there should be a blank
> monitor while the operating system loads (Windows 2000), and the monitor
> should be turned on only when the application is already running full-
> There is no way to do this just with software. Until the software
> starts, shutting down the monitor, the boot process will be shown, so I
> think that the only solution is some electronic circuit which I can
> control with my software.
> My solution I came up with is as follows: I am already able to write a
> certain bit pattern on the parallel port, so I would take four bits of
> that parallel port and feed them into a 74LSxxx to make some digital
> logic, to finally get one logical ON (+5V) if the input bits are set
> Then I would connect that logic high to the gate of two thyristors (or
> should it be triacs?) to make the vertical and horizontal sync signals
> reach the monitor.
> It works like this: I pick the vertical and horizontal sync signals from
> the output of the video port, connect them to the input of the
> thyristors, and when I trigger the gate, the signal becomes available at
> the output pin of the thyristor. From there it will be connected to the
> video connector.
> Without V/H sync, the monitor should stay blank (as it does when the
> energy saver is active). I hope that this way I could control the moment
> I want the monitor to be activated. No more boot process on the screen,
> I would trigger the gate only when my software is already running.
> Ok, this is my idea, and now I need some help. Can somebody tell me what
> components would be the most appropriate for this circuit? I think that
> the currents of the sync signals are pretty low, but I don't have any
> instruments to measure them. What thyristor/triac could I use, and how
> should I connect the TTL output to the gate? (If this is a good idea at
> all. If you see that this won't work at all, please tell me.)
> Any help would be appreciated. If you want to write me in private,
> please use the address upeters at mq dot srv dot br, or upeters at
> spamcop dot net for your reply. If you are a professional in the US and
> would like to help me, I could pay you with a money order... Of course I
> will accept free assistance as well. :-)
> Sao Paulo, Brazil