Plasma TVs - top-up scandal?
12 June 2002, 05:26 PM
#1
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degaussing a TV screen has nothing to do with plasma screens.
You degauss a TV when the electrical fields used to move the electron beams (blue/green/red) cause a perminant meganetising of the shadow mask that sits between the phospher screen surface and the electron guns.
Its a very simple process of taking an electomagnet and running it around the TV tube to demagnetise it, takes a few seconds to perform. When you switch your TV on, part of the warmup sequence is degaussing the tube, there is a series of electrical coils around the tube that are energised to do this.
Most serious cases of picture distortion that require degaussing are caused by locating large HiFi Speakers near the TV screen.
[Edited by johnfelstead - 12/6/2002 5:30:40 PM]
You degauss a TV when the electrical fields used to move the electron beams (blue/green/red) cause a perminant meganetising of the shadow mask that sits between the phospher screen surface and the electron guns.
Its a very simple process of taking an electomagnet and running it around the TV tube to demagnetise it, takes a few seconds to perform. When you switch your TV on, part of the warmup sequence is degaussing the tube, there is a series of electrical coils around the tube that are energised to do this.
Most serious cases of picture distortion that require degaussing are caused by locating large HiFi Speakers near the TV screen.
[Edited by johnfelstead - 12/6/2002 5:30:40 PM]
12 June 2002, 08:45 PM
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should be alright for ten years, when moving a plasma make sure it stays vertical, I know of some models which after being put on there backs never worked again!
Care to give specific examples of where this has actually happened???!!!
Quite simply... Bull$hit. Couldn't, and wouldn't ever happen. A good friend of mine works as an installer and to quote him.... "I've lost track of the number of time's our loan units come back laying down in the back of the van. Doesn't effect 'em at all..."
[Edited by kelvin - 12/6/2002 8:47:39 PM]
Care to give specific examples of where this has actually happened???!!!
Quite simply... Bull$hit. Couldn't, and wouldn't ever happen. A good friend of mine works as an installer and to quote him.... "I've lost track of the number of time's our loan units come back laying down in the back of the van. Doesn't effect 'em at all..."
[Edited by kelvin - 12/6/2002 8:47:39 PM]
06 December 2002, 03:19 PM
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I've heard that if you buy a plasma TV you need to have the "plasma" topped up every 2 years or so, a process that costs £200ish.
Is this true or a load of nonsense?
Is this true or a load of nonsense?
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06 December 2002, 04:09 PM
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This came up a while back. I said it then and I'll say it again. I reckon this will turn out to be one of the big scams relating to extended warranties. I reckon this will be used by a lot of the 'big electrical stores' with 'Johnny no stars' trying to sell you the extended warranty
The whole thing has come out of degaussing. There have been stories of people being told that the screens need degaussing once a year and it costs £100-£200 etc etc. All cr*p.
Most plasma tv manufacturers will quote a screen life expectancy of between 15000 and 40000 hours. Typically you would expect a plasma screen tv to last around 10 years (depending on usage). Generally the more you pay, the better the life expectancy.
Plasma screens are sealed, so there is no way they could degauss them even if they wanted to.
More details at the Plasma TV Buying Guide
Cheers
Chris
The whole thing has come out of degaussing. There have been stories of people being told that the screens need degaussing once a year and it costs £100-£200 etc etc. All cr*p.
Most plasma tv manufacturers will quote a screen life expectancy of between 15000 and 40000 hours. Typically you would expect a plasma screen tv to last around 10 years (depending on usage). Generally the more you pay, the better the life expectancy.
Plasma screens are sealed, so there is no way they could degauss them even if they wanted to.
More details at the Plasma TV Buying Guide
Cheers
Chris
06 December 2002, 08:33 PM
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Might not need topping up but they have a limited lifespan, we have them at work, and they've been switched on 24x7 since jkust before 2000 now they're all failing to some degree (picture quality)
- Jon
- Jon
06 December 2002, 08:56 PM
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on another subject:
chaz, your TV shop. Can you get small LCD monitors that will run from the other output on my video card ( ATI radeon 8500 ). I am trying to teach myself Autocad from online/supplied tutorials and it is a pain switching between the two programs with one display.
It would be nice to run the tut on one small screen and run CAD on the other.
chaz, your TV shop. Can you get small LCD monitors that will run from the other output on my video card ( ATI radeon 8500 ). I am trying to teach myself Autocad from online/supplied tutorials and it is a pain switching between the two programs with one display.
It would be nice to run the tut on one small screen and run CAD on the other.
06 December 2002, 08:56 PM
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Sorry - it's been a long day!!!
No offence intended! Apologies to all involved blah blah blah!!!
Hehe.
On a serious note - check out www.avforums.com if you have any questions re. AV related stuff... Great site
Kelvin.
No offence intended! Apologies to all involved blah blah blah!!!
Hehe.On a serious note - check out www.avforums.com if you have any questions re. AV related stuff... Great site
Kelvin.
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