javacookies :
Hi,
I'm really curious. This is not too life breaking
. Since I replaced my VGA cable with DVI, my monitor always blinks for about 1 second whenever I turn off a particular light. There are two lights near my PC but only the one in our living room triggers the blinking. So what's up with that? I'm also worried that it could be a serious matter. Thanks.
javacookies and other victims of the mystery,
Your description of a computer monitor blinking off when a light is turned off is very similar to the TV monitor in my bedroom. In my example I have a Samsung Blu-ray player with WiFi that streams Netflix to a 32" LCD TV via HDMI. The TV and Blu-ray player are plugged into a reasonable quality and recent surge strip. When I turn
off the light in the bathroom, the monitor can go off for several seconds and then returns. In some cases- 1 out of 10, when the monitor returns, the sound is lost and I have to cycle the Samsung off > on and restart Netflix. If it's playing a disk, the sound does not go off.
What I think is going on > The TV, Samsung Blu-ray, and the light are on the same electrical circuit- and in fact the light and the TV are only about 6' apart- but with two walls in between. I think the important factor is that the light is a fluorescent and with a miraculous ballast that is 45 years old- the same age as the house. And in some way, that elderly ballast- possibly in some kind of failure mode- is causing some kind of intense RF interference when switched off that is interrupting the HDMI signal or there is some capacitor discharge that is it is simply making an undervolt -or surge on the circuit.
I have a computer nearby on this circuit with a 27" monitor connected by DVI and it has not been affected. It is however, plugged into an 8- outlet. 11 Amp Powervar isolation transformer power conditioner- the kind used for hospital equipment and that has a robust RF and surge protection.
I agree, mysterious and troubling! The oddest feature is that it happens only when turning the light
off.
Questions for you > Is the light in question a flourescent? Is that light on the same circuit as the monitor?
Here's the stranger part. I took a break while writing this and connected the TV and then the Samsung to a long extension cord connected to the power conditioner. The TV did not blink off if either one or both were connected to the conditioner. However, when I plugged the TV and Samsung back into the surge strip, I can not get the TV to blink off- whether with disk or WiFi ! All I can think of is that repetitive switching of the fluourescent light is getting some capacitance discharged.
Or, it's demonic possession,..
I'll try some other things report back.
Cheers,
BambiBoom