Fooling an LCD Monitor

[Zach Zaborny]

Hello, to do testing on a monitor involving its adjustments, I need to
"fool" it into thinking there is a signal when there is none. It refuses to
start up without a signal, and immediately goes into suspend when the power
button is pressed. Is there a pin I could apply power to or something that
would give it a "signal". I don't care for test patterns, etc.

I have seen some VGA "test" schematics using PICs, etc. But I'm sure there
could be a way into just "fool" it so it would at least stay on.

-Zach

 

[CWatters]

"Zach Zaborny" <random@nts-technologies.org> wrote in message
news:10padv7iam8009f@corp.supernews.com...

Hello, to do testing on a monitor involving its adjustments, I need to
"fool" it into thinking there is a signal when there is none. It refuses
to
start up without a signal, and immediately goes into suspend when the
power
button is pressed. Is there a pin I could apply power to or something that
would give it a "signal". I don't care for test patterns, etc.

I have seen some VGA "test" schematics using PICs, etc. But I'm sure there
could be a way into just "fool" it so it would at least stay on.

Why not just connect it to a PC?

 

[Art]

Most that I have seen require an active signal source to switch on, other
than having it connected to an operational pc or laptop, the other
suggestion would be commercial testing equipment such as produced by Sencor
Corp. <

You could set up a test board using a motherboard, power switch, cpu,
memory, video card (unless the motherboard has inbedded video), and power
supply. Just connect the components together and connect the monitor to
the video jack. Does not require hard drive or even a keyboard or mouse.
However IMHO, it would be easier just using a pc or laptop.
"CWatters" <colin.watters@pandoraBOX.be> wrote in message

newsUald.20869$QU.1078411@phobos.telenet-ops.be...

"Zach Zaborny" <random@nts-technologies.org> wrote in message
news:10padv7iam8009f@corp.supernews.com...
Hello, to do testing on a monitor involving its adjustments, I need to
"fool" it into thinking there is a signal when there is none. It refuses
to
start up without a signal, and immediately goes into suspend when the
power
button is pressed. Is there a pin I could apply power to or something
that
would give it a "signal". I don't care for test patterns, etc.

I have seen some VGA "test" schematics using PICs, etc. But I'm sure
there
could be a way into just "fool" it so it would at least stay on.


Why not just connect it to a PC?

 

[Bob Myers]

"Zach Zaborny" <random@nts-technologies.org> wrote in message
news:10padv7iam8009f@corp.supernews.com...

Hello, to do testing on a monitor involving its adjustments, I need to
"fool" it into thinking there is a signal when there is none. It refuses
to
start up without a signal, and immediately goes into suspend when the
power
button is pressed. Is there a pin I could apply power to or something that
would give it a "signal". I don't care for test patterns, etc.

It would depend on just what the monitor considers an
"active signal" from the standpoint of its power-savings
features. Most out there in the field right now will still be
relying on the old VESA "DPMS" system, which simply
requires that you have sync signals applied to the sync
inputs that are within the recognized frequency range.
A roughly 10% duty cycle (10% high) TTL-level signal of over
10 kHz applied to the horizontal sync input, plus something
similar in the low 10's of Hz applied to the vertical, will
generally suffice. But it very likely IS going to be easier
just to find a PC somewhere and use that.

Bob M.

I have seen some VGA "test" schematics using PICs, etc. But I'm sure there
could be a way into just "fool" it so it would at least stay on.

-Zach

 

[Zach Zaborny]

Yes, it would be easier by connecting it to a PC, but am not willing to do
that in this situation (testing for project). I do see the fault in my
thinking that every monitor is different and will turn on in different
circumstances. I have seen schematics for simple VGA test-bar generators
that use the PIC microcontroller and I will probably end up using that.
Thanks for the input.

-Zach

"Bob Myers" <nospamplease@address.invalid> wrote in message
news:ZNrld.2884$gE4.194@news.cpqcorp.net...

"Zach Zaborny" <random@nts-technologies.org> wrote in message
news:10padv7iam8009f@corp.supernews.com...
Hello, to do testing on a monitor involving its adjustments, I need to
"fool" it into thinking there is a signal when there is none. It refuses
to
start up without a signal, and immediately goes into suspend when the
power
button is pressed. Is there a pin I could apply power to or something
that
would give it a "signal". I don't care for test patterns, etc.

It would depend on just what the monitor considers an
"active signal" from the standpoint of its power-savings
features. Most out there in the field right now will still be
relying on the old VESA "DPMS" system, which simply
requires that you have sync signals applied to the sync
inputs that are within the recognized frequency range.
A roughly 10% duty cycle (10% high) TTL-level signal of over
10 kHz applied to the horizontal sync input, plus something
similar in the low 10's of Hz applied to the vertical, will
generally suffice. But it very likely IS going to be easier
just to find a PC somewhere and use that.

Bob M.

I have seen some VGA "test" schematics using PICs, etc. But I'm sure
there
could be a way into just "fool" it so it would at least stay on.

-Zach

 

[Art]

If you are doing this commercially you may want to contact Sencor Equipment
and at least view their service products. May even find them on the web.
"Zach Zaborny" <random@nts-technologies.org> wrote in message
news:10pcrejgum11vef@corp.supernews.com...

Yes, it would be easier by connecting it to a PC, but am not willing to do
that in this situation (testing for project). I do see the fault in my
thinking that every monitor is different and will turn on in different
circumstances. I have seen schematics for simple VGA test-bar generators
that use the PIC microcontroller and I will probably end up using that.
Thanks for the input.

-Zach

"Bob Myers" <nospamplease@address.invalid> wrote in message
news:ZNrld.2884$gE4.194@news.cpqcorp.net...

"Zach Zaborny" <random@nts-technologies.org> wrote in message
news:10padv7iam8009f@corp.supernews.com...
Hello, to do testing on a monitor involving its adjustments, I need to
"fool" it into thinking there is a signal when there is none. It
refuses
to
start up without a signal, and immediately goes into suspend when the
power
button is pressed. Is there a pin I could apply power to or something
that
would give it a "signal". I don't care for test patterns, etc.

It would depend on just what the monitor considers an
"active signal" from the standpoint of its power-savings
features. Most out there in the field right now will still be
relying on the old VESA "DPMS" system, which simply
requires that you have sync signals applied to the sync
inputs that are within the recognized frequency range.
A roughly 10% duty cycle (10% high) TTL-level signal of over
10 kHz applied to the horizontal sync input, plus something
similar in the low 10's of Hz applied to the vertical, will
generally suffice. But it very likely IS going to be easier
just to find a PC somewhere and use that.

Bob M.

I have seen some VGA "test" schematics using PICs, etc. But I'm sure
there
could be a way into just "fool" it so it would at least stay on.

-Zach

 

[Jerry G.]

The monitor will require the proper sync pulses to be active. At must have a
scan reference, or there will be no full start-up. This is the way that they
are designed.

Invest in a small monitor test generator, or use a PC to run it.

--

Jerry G.
======

"Zach Zaborny" <random@nts-technologies.org> wrote in message
news:10padv7iam8009f@corp.supernews.com...

Hello, to do testing on a monitor involving its adjustments, I need to
"fool" it into thinking there is a signal when there is none. It refuses
to
start up without a signal, and immediately goes into suspend when the
power
button is pressed. Is there a pin I could apply power to or something that
would give it a "signal". I don't care for test patterns, etc.

I have seen some VGA "test" schematics using PICs, etc. But I'm sure there
could be a way into just "fool" it so it would at least stay on.

-Zach

 

[Andre]

"Jerry G." <jerryg50@hotmail.com> wrote in message news:<2vpatkF2oanlbU4@uni-berlin.de>...

The monitor will require the proper sync pulses to be active. At must have a
scan reference, or there will be no full start-up. This is the way that they
are designed.

Invest in a small monitor test generator, or use a PC to run it.

Better idea:- program a PIC 12C508 or similar to generate the two
waveforms.

This has the advantage that its relatively cheap (47p) and you can use
this for a number of other purposes such as testing VCR's.

-A

--

Jerry G.
======

"Zach Zaborny" <random@nts-technologies.org> wrote in message
news:10padv7iam8009f@corp.supernews.com...
Hello, to do testing on a monitor involving its adjustments, I need to
"fool" it into thinking there is a signal when there is none. It refuses
to
start up without a signal, and immediately goes into suspend when the
power
button is pressed. Is there a pin I could apply power to or something that
would give it a "signal". I don't care for test patterns, etc.

I have seen some VGA "test" schematics using PICs, etc. But I'm sure there
could be a way into just "fool" it so it would at least stay on.

-Zach