Keeping your monitor out of blue / lost signal screen

[dr_serious]

I have a old laptop 15.4" LCD screen that i converted to a monitor with a **broken link removed**. I'm planning to use this screen as a screen to view a signal that i recive from a wirless transmitter. But when my signal is to far from the source i loose the image and my screen goes in signal lost or blue screen until i recive a new signal. But every time I get the signal back theres a second delay until i get the image back becouse the monitor is slow i guess.

Now im looking for a solution to trick the signal that the monitor gets with another noise signal. So when i lose the signal the monitor wil get the noise and dont lose go in no signal mode...

Can you guys point me in the right direction with a circuit or something?

The signal i receive is a video stream of a live camera NTSC: 510(H)*492(V) or PAL: 500(H)*582(V). (I would rather have it working with PAL then NTSC)

I have a basic understanding of electronics/ circuits but I have totally no knowledge about video data.

Thx

 

[BradtheRad]

There could be a line on a circuit board inside, that changes state when a valid signal is coming in. If you could tie this line hi or lo (whichever is needed), then you might force the screen to always display whatever's incoming.

However it might not work either. Digital transmission is not like analog transmission. We have analog vcr's that show a blue screen when no signal is on a tape being played. If I fast play forward or rewind, that's when I see the snow on the tape.

However with digital, if the signal is unsuitable, the digital screen may not even display snow. Snow is not supposed to be part of the digital vocabulary. It may show the last image received, with block mismatches, or pixelation, or other odd effects.

From my slight experience with digital equipment when it loses signal, there will be a moment's pause while it checks to see if an acquired signal is strong enough and consistent enough to be displayed.

In other words, it may not work if you rig a signal generator at the same reception frequency, either inside the screen or as a wireless. Your screen will probably perform the same length of delay as it switches between your data source and your alternate source.