What causes picture throbbing?
10-23-00, 11:09 PM
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I have noticed a lot of picture "throbbing" on my 26" RCA TV. It is similar to what happens when you turn the contrast all the way up. The picture wil bend and shift whenever the lighting changes. But my TV does this even at the lowest contrast level. It sort of bends, or shifts the picture when light will appear on the screen. This is very appearant when I am on a DVD menu. For example, on the Final
Destination menu there is lightning in the background. Whenever the lightning strikes, the picture will bend outward on the edges.
I went into Best Buy the other day and I noticed that the televisions they have set up in the speaker rooms have this problem very very badly. The picture on the demo movie was distorting pretty severely. This was the case with all of the TVs in all of the speaker rooms. After seeing this, I started to think that the problem might have to do with all of the speakers which are set up around it. I have three fairly large speakers within a few feet of my TV. Is this some sort of electronic interferrence? Maybe something with the power supply? I really need help with this. I want to know that it is not a problem with my TV. It is really bugging me. Thanks for any help.
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[This message has been edited by caiman (edited October 23, 2000).]
Destination menu there is lightning in the background. Whenever the lightning strikes, the picture will bend outward on the edges.
I went into Best Buy the other day and I noticed that the televisions they have set up in the speaker rooms have this problem very very badly. The picture on the demo movie was distorting pretty severely. This was the case with all of the TVs in all of the speaker rooms. After seeing this, I started to think that the problem might have to do with all of the speakers which are set up around it. I have three fairly large speakers within a few feet of my TV. Is this some sort of electronic interferrence? Maybe something with the power supply? I really need help with this. I want to know that it is not a problem with my TV. It is really bugging me. Thanks for any help.
------------------
I am Jack's signature.
My very tiny, but ever-growing DVD list.
[This message has been edited by caiman (edited October 23, 2000).]
10-23-00, 11:27 PM
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It is called blooming, and happens when the white level is too high. A poor power supply or power source can cause it too.
[This message has been edited by BlondeGuy (edited October 23, 2000).]
[This message has been edited by BlondeGuy (edited October 23, 2000).]
10-24-00, 02:48 AM
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I don't think this is the problem but the magnets in drivers (speakers) can cause some pretty dramatic effects to happen on a TV if they are too close.
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Regards...
Drinker of much Pepsi, trainer of Dingo's and Jack's Aussie Moonshine importer...
John 3:16
10-24-00, 09:31 AM
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I second the "power supply" theory. Judging by the fact that the TV is 26", it must be getting old. If the power supply to the TV is not strong enough, large changes in brightness can cause the problems you described.
Other than purchasing a new TV, you can try adjusting both the brightness and contrast leves to minimize the effect. Lowering the color level can also help reduce color bleeding at lower brightness. Video Essentials disc can tell you more about these conditions.
As far as the TVs in the showroom, I'd be interested to know which brands. Also, those TVs have their brightness jacked waaay up, so any problems will be exaggerated. The proper brightness setting for a TV is well below the factory setting...
Other than purchasing a new TV, you can try adjusting both the brightness and contrast leves to minimize the effect. Lowering the color level can also help reduce color bleeding at lower brightness. Video Essentials disc can tell you more about these conditions.
As far as the TVs in the showroom, I'd be interested to know which brands. Also, those TVs have their brightness jacked waaay up, so any problems will be exaggerated. The proper brightness setting for a TV is well below the factory setting...
10-24-00, 03:55 PM
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Thanks for all the suggestions. First of all, The TV is brand new. I just got it a few months ago. I think it is one of the newer models. Second, I have worked with every setting and adjustment on the TV. I even rented Video Essentials with little success.
Now, the power supply theory is interesting to me. I do have quite a bit of crap plugged into one outlet. Could that be the problem? I am using a power strip with about 6 single outlets on it. It is filled up. Should I change this? Thanks.
PS: I also thought of the sexual conotations with the word "throbbing", but it was the best word I could think of to describe the problem.
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I am Jack's signature.
My very tiny, but ever-growing DVD list.
Now, the power supply theory is interesting to me. I do have quite a bit of crap plugged into one outlet. Could that be the problem? I am using a power strip with about 6 single outlets on it. It is filled up. Should I change this? Thanks.
PS: I also thought of the sexual conotations with the word "throbbing", but it was the best word I could think of to describe the problem.
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I am Jack's signature.
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10-24-00, 05:32 PM
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Sorry, I didn't know they were making 26" TVs.
Power supply problems are usually rooted within the TV itself. I suggest you try a few things of your own, because it can't hurt, and because I don't want to say that you got a bum TV.
Power supply problems are usually rooted within the TV itself. I suggest you try a few things of your own, because it can't hurt, and because I don't want to say that you got a bum TV.
10-24-00, 09:00 PM
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Another possibility is you may benefit from a power conditioner if you have crappy power. A power conditioner can make a huge difference in some cases. The Monster HT1000 can be bought online for about $100 and is worth it, especially if you spent alot of money on your home theater equipment. Not only do you get power conditioning but you get surge protection too.
[This message has been edited by BlondeGuy (edited October 24, 2000).]
[This message has been edited by BlondeGuy (edited October 24, 2000).]
