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Monitor Blinks when turning lights off

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January 2, 2013 11:14:04 AM

Hi,

I'm really curious. This is not too life breaking :D . 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.
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January 2, 2013 11:24:53 AM

well its nothing that serious though...i suspect your electric wiring must be responsible for that.

you should try checking that out with an electrician.
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January 2, 2013 11:46:36 AM

but it only started happening when I used DVI instead of VGA. I doubt it's the wiring :D 
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January 2, 2013 11:50:49 AM

well that may be due to the reason because the dvi cable is more sensitive to electromagnetic field than the vga one.
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a c 112 U Graphics card
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January 2, 2013 12:18:32 PM

This one is interesting, what kind of monitor and what kind if light. Most screens should have more then enough reserve in the power supply to avoid blinking. I have never seen a VGA OR DVI/HDMI cable pick up this kind of interference.
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January 2, 2013 12:33:50 PM

It's a circular fluorescent light. I have a 22" LED monitor. I tried turning on and immediately turning off the light and the monitor did not blinked. It seems that it only reacts to the light itself not electrically.
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January 2, 2013 12:38:12 PM

You don't happen to have a screen with some kind of light sensing eco mode(dims in darker rooms to save power) you you?
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January 2, 2013 12:49:20 PM

@javacookies i hav the same problem XD the reason is because bad wiring around u r house r some thing like that causing a power leak deep inside the circuit causing u r monitor 2 blink r turn off for 1 sec r 2 u can fix this by getting a electrician and ask him to check the wiring all round u r house its not u r pc's fauls ;)  gimme a thanx if this helped! :D  :D  :D 
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January 2, 2013 12:56:01 PM

Yah it could really be in wiring but it's not turning off. Only the screen dims and the led indicator is still on.
@nukemaster i'm not sure. i have Samsung s22b310. The thing is, the kitchen light should cause the blinking if it's really a light sensor. It's the one with direct light to the monitor. Now i'm becoming more curious :) 
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January 2, 2013 12:59:36 PM

you should indeed check out with an electrician
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January 2, 2013 1:19:05 PM

That looks to be just like the Samsung s22b300. The 300 has HDMI and not DVI, but other then that that look the same.

The only thing I can think of that would adjust the brightness on a screen like that would be dynamic contrast(Damn I hate that feature), but chances are it is NOT that in your case since it happens with the light and not how dark or bright the image on the screen is.

You do have some ECO options, but they are manual and should not do things without you telling them to.

I would try to plug it into another outlet, but it is strange that VGA did nothing and DVI does.

Either way, you can TRY to look into the settings on the screen, maybe something is set different from one to the other.
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a b U Graphics card
January 2, 2013 1:52:02 PM

Earth connection problem. make proper earth connection. Current leak due to wire damage / Voltage fluctuation .
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January 2, 2013 1:56:22 PM

@hytecgowthaman i dont think its because of earthing because if it was he would get an electric shock every time he touched his PC r any device connected to it
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January 2, 2013 2:26:53 PM

Earth/Ground is a SAFETY feature and should NOT cause you to get a shock. It prevents shocks if somehow power comes in contact with the metal casing of the computer/power supply, but by that point, you would have a MUCH bigger issue and would likely blow a fuse or trip a breaker.

If that screen uses the same power supply as the s22b300 model(damn they look close), it does not even have a ground wire.
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January 2, 2013 2:48:19 PM

I have a UPS. Maybe that's causing it??? anyway I'll try to investigate on this more. Thanks for all your inputs about this matter.
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January 19, 2013 2:39:12 PM

I tried to use VGA cable again just to check and yes! it does not blink. Switched to DVI and boom it blinks. Hmmmmm.....I'm really curious what's causing it.
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January 19, 2013 2:54:40 PM

I have honestly never seen this issue. Only other thing you may try is another cable, but even the cheapest cables I have seen do not do this.
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June 7, 2013 6:18:29 PM

Ever find A solution? I have the same problem. Samsung 23" Syncmaster P2370HD, HD5770, Dell XPS8300, 8 gb ram, Intel core i7 3.40, Win 7. Every time water cooler, AC, light switch, stove ect turns on my monitor blinks. Just recently started after I removed my video card to install a second Hard drive. I doubt it's the wiring in my apt.
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June 10, 2013 1:05:11 PM

Hey, I'm also having this problem!! Monitor turns off then turns back on after 1 sec when turning random lights in my apartment. Can this cause a problem for my rig or monitor? :( 
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June 10, 2013 3:36:56 PM

Update: I tried opening my catalyst control center and it would not open even after uninstalling it and reinstalling. I seen a post here giving instruction to right click on user folder in C drive and showing hidden files to repair the control center. After doing so my User folder became corrupt and was unusable. I looked up a work around creating 3 accounts on the Microsoft website to no avail. I then did a complete reinstall of Windows 7 on my XPS 8300. After re-installation everything works fine again my video card and my monitor, no more blinking and everything's back to normal. So I figure it was software related and nothing to do with hardware or the wiring in my dwelling. I'd suggest backing up your files right away before any become corrupt and be sure to run a virus/malware scanner prior to doing so. Hope this helps.

Forgot to add, I also was having no problem with the VGA out just the DVI port with an HDMI converter connected to my monitor.
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June 10, 2013 7:51:23 PM

javacookies said:
Hi,

I'm really curious. This is not too life breaking :D . 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
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June 11, 2013 9:32:11 PM

@bambiboom: I'm also thinking the same problem! The freakin' ballast could be the culprit of this one.. My monitor also turns off when a fluorescent bulb is turned off. I'm also connected to a fused extension wire (some sort of a surge protector, not as expensive as yours though! haha).
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June 12, 2013 6:00:12 AM

adimeister,

Certainly, I would think the kind of light has to be the key. Earlier on in this thread- January!, our friend nukemaster asked, ",.. what kind of monitor and what kind of light?" and javacookies replied, "It's a circular fluorescent light." Now, including yours, all (three) the mentions of the type of light is fluorescent.

Fluorescents are little generators of complex RF effects >

http://www.ieice.org/proceedings/EMC09/pdf/22S3-3.pdf

> and you see in this paper the field effects are bizarrely non-linear, have wide frequency bandwidths and the field strength is proximity-related = dirty little buggers if you're nearby!

Would it be too much to ask if you would try replacing the lamp that is causing your problem with an incandescent? I would try this except in my case the light is hard-wired / wall mounted.

Two more thoughts> LCD monitors are backlit with cold-cathode fluourescents and LED's are switched with ballast resistors that operate on voltage drops. It's a conspiracy of ballasts and I'm going to start wearing a tin foil hat!

I can see it now, "Ballasto: Legacy of Darkness", the exciting first 1D game played on a completely black screen.


Cheers,

BambiBoom
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June 12, 2013 12:17:08 PM

@bambiboom: hahaha you're hilarious bro. :D  In spite of me being entertained by you, I can't replace it too. It's also hardwired to the ceiling bro, and I don't have any experience on replacing fluorescent whole assembly to the direct incandescent bulb (direct PnP type of bulb, without the ballast and starter hahaha)

So, I guess we'll have to wait for another victim huh. haha I'm worried, will this have an effect on my monitor or rig?? Because I'll try to buy an AVR next week. That might solve the problem because I currently plug my whole system directly to the wall......
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June 12, 2013 2:45:04 PM

adimeiester,

O.K. Now we're getting somewhere- 1> all the lights identified (javacookies' is a circular kitchen light) are hard wired fluorescents and 2> Since last evening, I've had the TV plugged into my isolation transformer power conditioner- on the same circuit as the fluourescent light and after many tries, the TV has not suffered from the flourescent switching off syndrome.

I've poked about a bit looking for fluourescent RFI and switching noise data and there's enough, along with the results from trying the TV on a power conditioner to convince me that the problem has to be with from ballast switching RFI. An odd item > there were a couple of mentions that the switching noise is less on the old magnetic- those heavy Iron ballasts than the new electronic ones- I would have thought it was the reverse.

I think that anytime an electronic device is functionally interrupted by anther device is a time to worry about stress on the circuits. The TV is an old banger off Craigslist, but if it were happening to my monitor I would work out a solution. I think there are only a couple of choices- replace the fixture with incandescent- probably the less expensive idea, or find a good RFI supressor power strip or conditioner. In my Los Angeles power paranoia- the voltage varies from 109 to 131V and there must thousands of RF signals just passing through, I ended up with six Powervar and OneAC isolation transformer conditioners. These were expensive new- a 12A OneAC new was $1,100, but you can get the 6A ones off Ebahh for reasonable prices- $60-75. (600W = 5A). There's an 8.3A Powervar on Ebay for $90. No guarantees it would solve it, but I wonder if one of the following might not only solve the problem but be a general act of kindness to a computer system>

http://www.sweetwater.com/store/detail/M8x2/

> which is Furman conditioner- not an isolation transformer, but having very good RFI filtering and surge protection- $65. these are intended for audio - mainly recording systems. Furman also makes power strips with RFI filtering in the $35 range.

I might not only wear a tin foil hat, but add a grounding strap and power crystal so the NSA can't check my email,..

Let me know what happens!

Cheers,

BambiBoom


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June 12, 2013 9:54:31 PM

Bro I'm not in the US. I'm currently living in Macau. I don't have those resources. haha And the next solution that I would try is to just buy a computer AVR. I hope that would solve my problem.....
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June 13, 2013 2:51:59 AM

adimeister,

1> I'd only heard of AVR for generators- output devices- and didn't realize they were made for computers- as an input device. This seems to be a really useful idea, but I couldn't find anything very specific on a consumer level- can you give an example of one that you might use?

2> When you mentioned Macau, a place I only knew as being across a Bay from Hong Kong, I had a look at Macau in Google Earth, and saw what seemed the strangest thing I've ever seen on Google Earth- the street and place names in Macau.

Thee names are so amazing in that they are so unexpected. There is small bay called Guan Zhacun. To the south and slightly west of that bay is an area with several city blocks of square 4 or 5 story buildings- with central courtyards, probably flats called strangely, "Our Lady of Fatima's Parish". Street names include, "Avenida Leste do Hippodromo", Rua de Graciosa", "Avenida do Dr. Francisco Vierira Machado", "Avenida do Admirante Magalhaco Correira", Avenida de Artur Tamagnini Barbosa". There were very, very few Cantonese names and it struck me as odd as if I looked at a map of Mexico City and all the names were in Swedish.

At first I thought these were simply the Portuguese translation of Cantonese but because the names of people were so Iberian, I had to remember there was a Portuguese influence in Macau in the way there was an English one in Hong Kong.

This just seemed impossibly exotic- a wonderful surprise that really woke me up this morning!

Regards to Macau!

BambiBoom
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June 13, 2013 10:03:24 PM

@bambiboom: hahaha you've researched it huh. Yea, Macau has been raped by the portugese. haha There are a lot of pretty Macanese (cross breed of Chinese and Portugese variants HAHAHAHAHA) here.

Anyway, I think the problem here now is the wiring in the apartment. Because when I was cooking, I turned on the big-ass exhaust fan then the monitor blinked again.... Oh well. Chinese quality.... hahaha

AVR like this would do I guess. http://pcrxcomputing.com/Accessories/UPS-AVR?product_id...
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June 13, 2013 11:17:45 PM

adimeister,

Macau > Whenever I have a conversation with someone from a place I've never been- I've never been East of Budapest nor West of Hawaii- I use it as an excuse to see what the cities are like. As an architect, street layouts, type of housing, proportion of of parks, the kind of cars, and so on are always interesting.

Yes, as I thought more about it, the problem is not probably RF ( I may not need the tin foil hat after all), but a simple electrical surge or undervolt from switching noise. If I had a DVM, I'd try in on the TV outlet and see what the numbers are when the bathroom light is switched.

I had a look at the AVR to which you linked- it has a pleasant industrial quality to the appearance. Is it possible that it's 300 Philippine Pesos- $7-8 US!

I'm still running my television machine from the power conditioner.

Cheers,

BambiBoom
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June 14, 2013 9:52:02 PM

@bambiboom: Wow bro, you're an architect! That's nice. :)  I tried to be an engineer when I was in college, got lazy. Now I regret, really.. Stuck on a sucky job, etc.. Enough ranting now. hahaha

Really?? I never realized that the "colonizers" would have that advantage, I always thought that the countries which got colonized would always have the advantage. Like having a better economy, adapting to Western or European food, having better genes (sound funny but I'm happy with this one!), etc...

I'm originally from Philippines, we have so much beautiful people there because the Japs, Spaniards, and Americans raped our ancestors. hahaha So we have a lot of western influence, more than you can imagine!! But I'm happy with it, unfortunately we have so much corrupt politicians so we never really had a chance to prosper after the Americans left us. Oh well.. hehehe

Where are you from bamiboom?

I'll try to find an AVR here in Macau, hopefully they have one. The people here are 60% well off so they don't really care about their money and surge protectors or anything like that. It's not a "thing" here. They tend to always buy the newest tech here..

The streets here are in Portuguese and Cantonese, thank God! It would be such a headache if it would have the four numbers that you said. haha
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June 14, 2013 11:32:24 PM

adimeister,

Computer content > Had a long day of CAD today- designing a beach house on the East Coast US- and was slightly alarmed at the temperatures of the RAM- 83 C (typically about 72-75) and the CPU cores were warm too- 65C (usually 61-63). The highest RAM temperature I've seen was 85C and I panicked until I learned that DDR-2 is hot, hot, hot. I felt a little better when I read of those with DDR2 seeing 89 and 93 C. The odd thing was that I had placed a fan on the floor focusing air at the lower front grille (Dell Precision T5400) and which has a a fan behind it drawing air in- and the temperatures went up a couple of degrees. When I removed the fan, the temperatures went down. Counter intuitive!

You bring up interesting point regarding colonization. As a kid - born in the Midwest, US- I noticed that dogs and cats of random, mixed breed seemed healthier, lived longer, and had better personalities than very pure bred ones. Later, I heard a great term the English have for this tendency> "hybrid vigour"- mutts are stronger. Likewise with people, I noticed comments about inbred royalty that more often had problems like hemophilia and epilepsy.

To me, there's no question that there are sometimes advantages to those colonized- if- it's a benign form which was rare. I liked very much the scene in the Monty Python movie , "The Life of Brian" in which the revolutionaries complain about Roman occupation, "Besides the legal system, technology, sanitation, roads, education, and military protection, what did the Romans ever do for us?" Spanish colonization of Central and South America was less pleasant- slavery, English dominance of India had a stabilizing influence, but went on about 150 years too long, so it varies.

But, you're right that a mixture introduces a vitality of a sort both culturally and even as an expansion of the gene pool- like "hybrid vigour". Culture clash though too often causes conflict and in the US- almost entirely composed of immigrants and proclaiming equality- there is an ironic / hypocritical backlash against immigrants.

And, you're right about mixed populations sometimes being very attractive and the Philippines is a good example. My cousin has lived on San Miguel since 1984 and he sends me photos of the people there- and they're all beautiful- and look very happy even though they are very poor- no general power or water system and only a mile or two of paved roads. It sounds peaceful and quiet.

In Los Angeles, I pick up food from a Chinese restaurant, where I read the free Philippines newspaper while waiting and it was always full of stories of the corrupt politicians. Years before there was Imelda Marcos and her 3,000 pair of shoes but then came the stories of the B-movie star Estrada - like Reagan- that became President under suspicious circumstances and who is said to have ordered the killing of a gambler that gave him millions in casino kickbacks. The situation seems almost comical, except as you mention, the corruption has been so widespread and so few people control all the money that it repressed the economy.

Cheers,

BambiBoom
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June 15, 2013 12:39:45 AM

@bambiboom: Damn bro that was too informative, too much detail. Makes my brain hurt. hahaha Just joking. Yea, of course there are cons (a lot of them). But I didn't live in the timeline where the colonization is taking place, so we're more lucky than our ancestors that's for sure. I also heard about that in NatGeo, crossbreed or hybrid genes brings out the best qualities. Like what you said, more healthy and more physically strong.

With that being said, we Filipinos, now feel the advantages when the US colonized us. Imagine if we were like North Korea, damn!!! We're more open minded, more exposed to other cultures, more civilized. What I'm trying to say is, we're more like ready to mingle with anyone in the world. hahahaha Unlike other countries who are more conservative and think that their norms are super normal (like eating fetus ehem ehem ehem china ehem). hahaha

Anyway, I had an experience with CAD also!! :D  But only until simple lenghts, cubes, honey comb structures. :D  hehe That was fun, more fun than the manual drawing!!

Yea, so much corruption that they want to take what is more than what they need. I don't believe corruption is absent in the US too. But if it exists, I think they only take a small amount of money just to eat at a fancy restaurant on one weekend, or spend a 3day vacation. In Philippines they steal so much that it's intended for retirement purposes. sad. haha
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June 29, 2013 8:42:53 AM

Wow! I'm surprised this thread is still alive and there are others who experience the same mysterious problem I have although the last few replies are a bit out off topic :pfff:  :lol: 

look who's here...guess what....Akalain mo nga naman....i hope he still understand that even he's in Macau now,hahaha

Anyway I want to join your very interesting conversation but i'm not an intellectual person like you :pt1cable: 
BTW just to let you know I'm still experiencing the blinking problem and I'm not taking any action about it,hahaha
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June 29, 2013 11:20:18 AM

Yea, me too. Everytime I turn off any appliance in the kitchen, my monitor blinks. hahaha Oo naman! :D 
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December 5, 2013 9:59:10 PM

I'm facing this issue with my Samsung LCD TV. It blinks on HDMI mode when I switch on or off any switch. this doesnt happen when the AV mode is on.

Any suggestions?
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December 6, 2013 12:57:17 AM

Damn it so a lot of people has this problem. I hope someone has the answer to this one. I still have this problem..
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March 4, 2014 10:45:22 AM

I am having this problem with my monitor, whenever i switched off the lights there is a CHANCE whereby my monitor will goes off for 1sec and back again... Pretty weird... which is why i decided to google this which led me to this thread.. have circular florescent light too!
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March 4, 2014 11:23:21 AM

flamesser said:
I am having this problem with my monitor, whenever i switched off the lights there is a CHANCE whereby my monitor will goes off for 1sec and back again... Pretty weird... which is why i decided to google this which led me to this thread.. have circular florescent light too!


flamesser.

Thanks for adding another fluorescent light to the evidence pile.

I decided at the time this thread was current, that the fluorescent light had to be the trouble, though I still don't know exactly. I always meant to put a DVM on the outlet and see what happened when switching the fluourescent light on. I simply plugged the Blu-Ray and TV into another outlet some distance away on a long, large gauge, outdoor three-prong cord- I think on another circuit and never again had the problem.

Cheers,

BambiBoom
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March 4, 2014 7:40:41 PM

Hey just to update too! I had that problem before when I was in a cheap apartment in Macau. Now, I've moved back to Philippines and the problem is gone!! I've played with the lights all over our house, NEVER HAPPENED AGAIN!! :D  I believe it's with the whole house's wiring system, and not with any lights bro.. Because back then when I was in Macau, when I switch on OR off any electric appliance, my monitor would turn off.
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April 2, 2014 10:12:43 AM

All right guys, I too am facing this problem and it is very frustrating. I don't have any fluorescent light in my house. I can agree with adimeister though, wiring in my house is not done properly and there's most definitely no earthing done here, however latter should not cause this. It's a new Dell S2240L and I have been using it for 2 days, bought a double battery 800VA UPS hoping it would solve the issue, but it didn't (although I had to get one anyway). I have stashed VGA cable somewhere in those boxes, will check with that tomorrow.

I was also experiencing horizontal disturbances (like Jesse's screen when they test the giant magnet in Breaking Bad), but they're almost gone since I installed the UPS.

I won't be re-doing my house's wiring because 1) I'm a tenant, landlord won't allow it and 2) that doesn't make sense as it's not causing any damage to the electronics as evident from replies above.
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April 3, 2014 7:32:01 AM

Okay, switched to VGA cable and the problem seems to have gone. Will continue using it until I shift to a better place.
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April 21, 2014 3:15:48 PM

hytecgowthaman said:
Earth connection problem. make proper earth connection. Current leak due to wire damage / Voltage fluctuation .


yes - that what i was guessing

I have doubled the voltage
( in accordance with specification)
not much help

but after a while it wend all dark

so i sent it to Samsung

let's see if they are going to change the transformer( that's what would i do if i have second chance to play with it)
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May 15, 2014 8:49:01 PM

i bought a 22' lg monitor and it started to blink for 1-2 seconds everytime i turn on the light ( fluorescent ) lamp only , but more strange than that /...,, my other monitor lg 19' in another apartment started to randomly flicker the same way but without turning on any lights ,
i started to find out why it does that until today when i turned on the bug zapper and it started to act the same every time the bug zapper catch a mosquito , and sometime not blink with the zapper but it blinks about 7 of 10 catches of zapper ..i 'm so curious to know what happens and how to fix that problem ( if we can change a cap or so in the monitor or even make a kind of pass filter to prevent what ballast does :D  ,, thx in advance >>> ( all devices works on 220v

update : both monitors work on vga cable ,, never tried to use dvi or any cable else
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June 9, 2014 10:12:41 AM

I have signed in to chime on this problem.

Every time a light[fluorescent] or my air conditioner clicks, my Dell2440L monitor flickers off for one second.
In fact any appliance I turn on or off in my room or outside surrounding area causes it.

Previously I had a problem of loud 'PAP' sound from the mini speaker when switches were turning on or off. I put in a Belkin surge protector and this sound was large minimised to a derp but it doesn't help with the monitor problem.

Wondering if anybody has had success with an AVR and what spec would you recommend.
Thanks in advance. :) 
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16 minutes ago

Shazia44 said:
I'm facing this issue with my Samsung LCD TV. It blinks on HDMI mode when I switch on or off any switch. this doesnt happen when the AV mode is on.

Any suggestions?


Hey, is this problem solved by now? I am facing this issue now. Want some help.
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