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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Plasma TV Foggy area
I don't have this tv in hand now and also don't have the make and model of
this display at the moment but all I am looking for is general information for now. This tv has a smudged / blurry area on the screen. It looks almost like it is dirty from a oily hand but it doesn't wipe off. It is not a rectangular area. I am not familar with the common failure modes of Plasma displays. What is your best guess would cause this. Thanks in advance, Mike |
#2
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Plasma TV Foggy area
On Fri, 03 Sep 2010 23:45:09 +0900, Michael Kennedy wrote:
I don't have this tv in hand now and also don't have the make and model of this display at the moment but all I am looking for is general information for now. This tv has a smudged / blurry area on the screen. It looks almost like it is dirty from a oily hand but it doesn't wipe off. It is not a rectangular area. I am not familar with the common failure modes of Plasma displays. What is your best guess would cause this. Thanks in advance, Mike Since it only covers a non-symmetrical portion of the screen my guestimate would be the screen itself. -- Live Fast, Die Young and Leave a Pretty Corpse |
#4
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Plasma TV Foggy area
"Meat Plow" wrote in message news On Fri, 03 Sep 2010 23:45:09 +0900, Michael Kennedy wrote: I don't have this tv in hand now and also don't have the make and model of this display at the moment but all I am looking for is general information for now. This tv has a smudged / blurry area on the screen. It looks almost like it is dirty from a oily hand but it doesn't wipe off. It is not a rectangular area. I am not familar with the common failure modes of Plasma displays. What is your best guess would cause this. Thanks in advance, Mike Since it only covers a non-symmetrical portion of the screen my guestimate would be the screen itself. Thanks for the insight Meat. These aren't affected by magnets the way CRT sets are they? Sorry for the stupid questions, but I have never taken apart, owned or even used a plasma display. I am only familiar with the VERY basic principles of operation and know it uses phosphors which are similar to a CRT but uses some other method to illuminate the phosphors. I guess uses some kind of micro printed circuitry similar to an LCD display, but I could be totally wrong about that. |
#5
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Plasma TV Foggy area
"Randy Day" wrote in message ... In article , says... I don't have this tv in hand now and also don't have the make and model of this display at the moment but all I am looking for is general information for now. This tv has a smudged / blurry area on the screen. It looks almost like it is dirty from a oily hand but it doesn't wipe off. It is not a rectangular area. I am not familar with the common failure modes of Plasma displays. What is your best guess would cause this. Someone used solvent to clean the screen? Interesting idea.. That's a case where the screen could be fixed... I will have a close look at it in a couple of days. The price is right on this thing, but I don't want to sink money into it if the screen is about to crap out.. Since that's the one piece that cant be repaired. |
#6
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Plasma TV Foggy area
On Sat, 04 Sep 2010 00:18:51 +0900, Michael Kennedy wrote:
"Meat Plow" wrote in message news On Fri, 03 Sep 2010 23:45:09 +0900, Michael Kennedy wrote: I don't have this tv in hand now and also don't have the make and model of this display at the moment but all I am looking for is general information for now. This tv has a smudged / blurry area on the screen. It looks almost like it is dirty from a oily hand but it doesn't wipe off. It is not a rectangular area. I am not familar with the common failure modes of Plasma displays. What is your best guess would cause this. Thanks in advance, Mike Since it only covers a non-symmetrical portion of the screen my guestimate would be the screen itself. Thanks for the insight Meat. These aren't affected by magnets the way CRT sets are they? Sorry for the stupid questions, but I have never taken apart, owned or even used a plasma display. I am only familiar with the VERY basic principles of operation and know it uses phosphors which are similar to a CRT but uses some other method to illuminate the phosphors. I guess uses some kind of micro printed circuitry similar to an LCD display, but I could be totally wrong about that. The phosphors are illuminated by bursts of plasma emitting a UV light not an electron beam. Cells are filled with gases including a small amount of mercury. Each cell is capable of the three primary colors and depending on the amount of electricity applied to the cell controls the intensity. That's about it for my understanding. -- Live Fast, Die Young and Leave a Pretty Corpse |
#7
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Plasma TV Foggy area
On Sat, 4 Sep 2010 00:18:51 +0900, Michael Kennedy wrote:
"Meat Plow" wrote in message news On Fri, 03 Sep 2010 23:45:09 +0900, Michael Kennedy wrote: I don't have this tv in hand now and also don't have the make and model of this display at the moment but all I am looking for is general information for now. This tv has a smudged / blurry area on the screen. It looks almost like it is dirty from a oily hand but it doesn't wipe off. It is not a rectangular area. I am not familar with the common failure modes of Plasma displays. What is your best guess would cause this. Thanks in advance, Mike Since it only covers a non-symmetrical portion of the screen my guestimate would be the screen itself. Thanks for the insight Meat. These aren't affected by magnets the way CRT sets are they? Sorry for the stupid questions, but I have never taken apart, owned or even used a plasma display. I am only familiar with the VERY basic principles of operation and know it uses phosphors which are similar to a CRT but uses some other method to illuminate the phosphors. I guess uses some kind of micro printed circuitry similar to an LCD display, but I could be totally wrong about that. There is no convergance nor is there any concept of focussing. The pixels are fixed in size and location and nothing can affect that. |
#8
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Plasma TV Foggy area
"Meat Plow" wrote in message news On Sat, 04 Sep 2010 00:18:51 +0900, Michael Kennedy wrote: "Meat Plow" wrote in message news On Fri, 03 Sep 2010 23:45:09 +0900, Michael Kennedy wrote: I don't have this tv in hand now and also don't have the make and model of this display at the moment but all I am looking for is general information for now. This tv has a smudged / blurry area on the screen. It looks almost like it is dirty from a oily hand but it doesn't wipe off. It is not a rectangular area. I am not familar with the common failure modes of Plasma displays. What is your best guess would cause this. Thanks in advance, Mike Since it only covers a non-symmetrical portion of the screen my guestimate would be the screen itself. Thanks for the insight Meat. These aren't affected by magnets the way CRT sets are they? Sorry for the stupid questions, but I have never taken apart, owned or even used a plasma display. I am only familiar with the VERY basic principles of operation and know it uses phosphors which are similar to a CRT but uses some other method to illuminate the phosphors. I guess uses some kind of micro printed circuitry similar to an LCD display, but I could be totally wrong about that. The phosphors are illuminated by bursts of plasma emitting a UV light not an electron beam. Cells are filled with gases including a small amount of mercury. Each cell is capable of the three primary colors and depending on the amount of electricity applied to the cell controls the intensity. That's about it for my understanding. Hmm.. Interesting. Plasma bursts.Hence why it's called a Plasma display.. Thanks for the basic run down. |
#9
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Plasma TV Foggy area
"AZ Nomad" wrote in message ... On Sat, 4 Sep 2010 00:18:51 +0900, Michael Kennedy wrote: "Meat Plow" wrote in message news On Fri, 03 Sep 2010 23:45:09 +0900, Michael Kennedy wrote: I don't have this tv in hand now and also don't have the make and model of this display at the moment but all I am looking for is general information for now. This tv has a smudged / blurry area on the screen. It looks almost like it is dirty from a oily hand but it doesn't wipe off. It is not a rectangular area. I am not familar with the common failure modes of Plasma displays. What is your best guess would cause this. Thanks in advance, Mike Since it only covers a non-symmetrical portion of the screen my guestimate would be the screen itself. Thanks for the insight Meat. These aren't affected by magnets the way CRT sets are they? Sorry for the stupid questions, but I have never taken apart, owned or even used a plasma display. I am only familiar with the VERY basic principles of operation and know it uses phosphors which are similar to a CRT but uses some other method to illuminate the phosphors. I guess uses some kind of micro printed circuitry similar to an LCD display, but I could be totally wrong about that. There is no convergance nor is there any concept of focussing. The pixels are fixed in size and location and nothing can affect that. That's the question I was wondering.. Thanks! I've got a little better idea of how this thing works now. Before it was all speculation. |
#10
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Plasma TV Foggy area
"Meat Plow" wrote in message news On Sat, 04 Sep 2010 00:18:51 +0900, Michael Kennedy wrote: "Meat Plow" wrote in message news On Fri, 03 Sep 2010 23:45:09 +0900, Michael Kennedy wrote: I don't have this tv in hand now and also don't have the make and model of this display at the moment but all I am looking for is general information for now. This tv has a smudged / blurry area on the screen. It looks almost like it is dirty from a oily hand but it doesn't wipe off. It is not a rectangular area. I am not familar with the common failure modes of Plasma displays. What is your best guess would cause this. Thanks in advance, Mike Since it only covers a non-symmetrical portion of the screen my guestimate would be the screen itself. Thanks for the insight Meat. These aren't affected by magnets the way CRT sets are they? Sorry for the stupid questions, but I have never taken apart, owned or even used a plasma display. I am only familiar with the VERY basic principles of operation and know it uses phosphors which are similar to a CRT but uses some other method to illuminate the phosphors. I guess uses some kind of micro printed circuitry similar to an LCD display, but I could be totally wrong about that. The phosphors are illuminated by bursts of plasma emitting a UV light not an electron beam. Cells are filled with gases including a small amount of mercury. Each cell is capable of the three primary colors and depending on the amount of electricity applied to the cell controls the intensity. That's about it for my understanding. My first thoughts were it working similar to a VFD in some kind of complicated arangement... |
#11
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Plasma TV Foggy area
On Sat, 04 Sep 2010 00:47:51 +0900, Michael Kennedy wrote:
"Meat Plow" wrote in message news On Sat, 04 Sep 2010 00:18:51 +0900, Michael Kennedy wrote: "Meat Plow" wrote in message news On Fri, 03 Sep 2010 23:45:09 +0900, Michael Kennedy wrote: I don't have this tv in hand now and also don't have the make and model of this display at the moment but all I am looking for is general information for now. This tv has a smudged / blurry area on the screen. It looks almost like it is dirty from a oily hand but it doesn't wipe off. It is not a rectangular area. I am not familar with the common failure modes of Plasma displays. What is your best guess would cause this. Thanks in advance, Mike Since it only covers a non-symmetrical portion of the screen my guestimate would be the screen itself. Thanks for the insight Meat. These aren't affected by magnets the way CRT sets are they? Sorry for the stupid questions, but I have never taken apart, owned or even used a plasma display. I am only familiar with the VERY basic principles of operation and know it uses phosphors which are similar to a CRT but uses some other method to illuminate the phosphors. I guess uses some kind of micro printed circuitry similar to an LCD display, but I could be totally wrong about that. The phosphors are illuminated by bursts of plasma emitting a UV light not an electron beam. Cells are filled with gases including a small amount of mercury. Each cell is capable of the three primary colors and depending on the amount of electricity applied to the cell controls the intensity. That's about it for my understanding. My first thoughts were it working similar to a VFD in some kind of complicated arangement... What fascinates me still is the workings of a DLP. -- Live Fast, Die Young and Leave a Pretty Corpse |
#12
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Plasma TV Foggy area
"Meat Plow" wrote in message news On Sat, 04 Sep 2010 00:47:51 +0900, Michael Kennedy wrote: "Meat Plow" wrote in message news On Sat, 04 Sep 2010 00:18:51 +0900, Michael Kennedy wrote: "Meat Plow" wrote in message news On Fri, 03 Sep 2010 23:45:09 +0900, Michael Kennedy wrote: I don't have this tv in hand now and also don't have the make and model of this display at the moment but all I am looking for is general information for now. This tv has a smudged / blurry area on the screen. It looks almost like it is dirty from a oily hand but it doesn't wipe off. It is not a rectangular area. I am not familar with the common failure modes of Plasma displays. What is your best guess would cause this. Thanks in advance, Mike Since it only covers a non-symmetrical portion of the screen my guestimate would be the screen itself. Thanks for the insight Meat. These aren't affected by magnets the way CRT sets are they? Sorry for the stupid questions, but I have never taken apart, owned or even used a plasma display. I am only familiar with the VERY basic principles of operation and know it uses phosphors which are similar to a CRT but uses some other method to illuminate the phosphors. I guess uses some kind of micro printed circuitry similar to an LCD display, but I could be totally wrong about that. The phosphors are illuminated by bursts of plasma emitting a UV light not an electron beam. Cells are filled with gases including a small amount of mercury. Each cell is capable of the three primary colors and depending on the amount of electricity applied to the cell controls the intensity. That's about it for my understanding. My first thoughts were it working similar to a VFD in some kind of complicated arangement... What fascinates me still is the workings of a DLP. Agreed.. Quite amazing what can be done with a silicon chip. |
#13
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Plasma TV Foggy area
Someone used solvent to clean the screen?
A good suggestion. It's hard to imagine a plasma screen being "out of focus", as there is nothing /to/ focus -- that I'm aware of. |
#14
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Plasma TV Foggy area
Randy Day wrote:
In articleVridnT16DI5klBzRnZ2dnVY3go2dnZ2d@giganews. com, says... I don't have this tv in hand now and also don't have the make and model of this display at the moment but all I am looking for is general information for now. This tv has a smudged / blurry area on the screen. It looks almost like it is dirty from a oily hand but it doesn't wipe off. It is not a rectangular area. I am not familar with the common failure modes of Plasma displays. What is your best guess would cause this. Someone used solvent to clean the screen? --- news://freenews.netfront.net/ - complaints: --- Aren't the front of the screens made of glass??? If so, how would a solvent affect the screen? |
#15
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Plasma TV Foggy area
"Ken" wrote in message ... Randy Day wrote: In articleVridnT16DI5klBzRnZ2dnVY3go2dnZ2d@giganews. com, says... I don't have this tv in hand now and also don't have the make and model of this display at the moment but all I am looking for is general information for now. This tv has a smudged / blurry area on the screen. It looks almost like it is dirty from a oily hand but it doesn't wipe off. It is not a rectangular area. I am not familar with the common failure modes of Plasma displays. What is your best guess would cause this. Someone used solvent to clean the screen? --- news://freenews.netfront.net/ - complaints: --- Aren't the front of the screens made of glass??? If so, how would a solvent affect the screen? Yes but its coated with an anti-glare surface. Just like any quality CRT monitor had. That as well could be destroyed if you used a solvent based cleaner on it. |
#16
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Plasma TV Foggy area
On Fri, 3 Sep 2010 23:45:09 +0900, "Michael Kennedy"
wrote: I don't have this tv in hand now and also don't have the make and model of this display at the moment but all I am looking for is general information for now. This tv has a smudged / blurry area on the screen. It looks almost like it is dirty from a oily hand but it doesn't wipe off. It is not a rectangular area. I am not familar with the common failure modes of Plasma displays. What is your best guess would cause this. Thanks in advance, Mike As has already been suggested, it must be someting on the surface of the panel itself. Use of a cleaner is one possibility. Another is some sort of grease or other material. Some replacement panels have a protective film. If that was not removed at the factory, or it left a residue, that would be a possible result. IMHO, that's an extreme long shot. One good source of information on Plasma displays is to Google 'Plasma training manual Scribd' This will bring up a number of training manuals. The LG ones in particular have much information on the actual construction of the panel. The down side is it is the translation was horrible. PlainBill |
#17
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Plasma TV Foggy area
Michael Kennedy wrote:
"AZ Nomad" wrote in message ... On Sat, 4 Sep 2010 00:18:51 +0900, Michael Kennedy wrote: "Meat Plow" wrote in message news On Fri, 03 Sep 2010 23:45:09 +0900, Michael Kennedy wrote: I don't have this tv in hand now and also don't have the make and model of this display at the moment but all I am looking for is general information for now. This tv has a smudged / blurry area on the screen. It looks almost like it is dirty from a oily hand but it doesn't wipe off. It is not a rectangular area. I am not familar with the common failure modes of Plasma displays. What is your best guess would cause this. Thanks in advance, Mike Since it only covers a non-symmetrical portion of the screen my guestimate would be the screen itself. Thanks for the insight Meat. These aren't affected by magnets the way CRT sets are they? Sorry for the stupid questions, but I have never taken apart, owned or even used a plasma display. I am only familiar with the VERY basic principles of operation and know it uses phosphors which are similar to a CRT but uses some other method to illuminate the phosphors. I guess uses some kind of micro printed circuitry similar to an LCD display, but I could be totally wrong about that. There is no convergance nor is there any concept of focussing. The pixels are fixed in size and location and nothing can affect that. That's the question I was wondering.. Thanks! I've got a little better idea of how this thing works now. Before it was all speculation. Sounds like you've had one or more pixels short/burn out and caused some soot to cover the inside of the screen a bit? Jamie |
#18
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Plasma TV Foggy area
"Michael Kennedy" wrote in message ... "AZ Nomad" wrote in message ... On Sat, 4 Sep 2010 00:18:51 +0900, Michael Kennedy wrote: "Meat Plow" wrote in message news On Fri, 03 Sep 2010 23:45:09 +0900, Michael Kennedy wrote: I don't have this tv in hand now and also don't have the make and model of this display at the moment but all I am looking for is general information for now. This tv has a smudged / blurry area on the screen. It looks almost like it is dirty from a oily hand but it doesn't wipe off. It is not a rectangular area. I am not familar with the common failure modes of Plasma displays. What is your best guess would cause this. Thanks in advance, Mike Since it only covers a non-symmetrical portion of the screen my guestimate would be the screen itself. Thanks for the insight Meat. These aren't affected by magnets the way CRT sets are they? Sorry for the stupid questions, but I have never taken apart, owned or even used a plasma display. I am only familiar with the VERY basic principles of operation and know it uses phosphors which are similar to a CRT but uses some other method to illuminate the phosphors. I guess uses some kind of micro printed circuitry similar to an LCD display, but I could be totally wrong about that. There is no convergance nor is there any concept of focussing. The pixels are fixed in size and location and nothing can affect that. That's the question I was wondering.. Thanks! I've got a little better idea of how this thing works now. Before it was all speculation. It was not unknown for plasma cells on older panels to develop a 'memory' of some bright content that had been displayed, resulting in a sort of visible 'stain'. In the worst case, this could cause permanent damage to the cells in the area, but often, the effect could be negated with a special service mode that did an intense white wipe of the panel. I'm pretty sure that modern panels don't suffer from this problem, and are much less susceptible to cell burn from high intensity static displays, but if the set is more than a few years old, it might be worth checking to see if there is a service mode that carries out a panel wipe. It may even be available as a user function through one of the menus. Have a read of http://en.wikipedia.org/wiki/Plasma_display For a good description of the principles involved Arfa |
#19
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Plasma TV Foggy area
"Michael Kennedy" wrote in message
... "Randy Day" wrote in message ... In article , says... I don't have this tv in hand now and also don't have the make and model of this display at the moment but all I am looking for is general information for now. This tv has a smudged / blurry area on the screen. It looks almost like it is dirty from a oily hand but it doesn't wipe off. It is not a rectangular area. I am not familar with the common failure modes of Plasma displays. What is your best guess would cause this. Someone used solvent to clean the screen? Interesting idea.. That's a case where the screen could be fixed... I will have a close look at it in a couple of days. The price is right on this thing, but I don't want to sink money into it if the screen is about to crap out.. Since that's the one piece that cant be repaired. Lets not get ahead of ourselves - do we know for sure it's really a plasma and not an LCD? My customers often confuse the two. If not damage to anti-glare coating which has been suggested, it does sound more like an LCD type problem to me. Mark Z. |
#20
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Plasma TV Foggy area
On Sat, 04 Sep 2010 01:58:16 +0100, Arfa Daily wrote:
"Michael Kennedy" wrote in message ... "AZ Nomad" wrote in message ... On Sat, 4 Sep 2010 00:18:51 +0900, Michael Kennedy wrote: "Meat Plow" wrote in message news On Fri, 03 Sep 2010 23:45:09 +0900, Michael Kennedy wrote: I don't have this tv in hand now and also don't have the make and model of this display at the moment but all I am looking for is general information for now. This tv has a smudged / blurry area on the screen. It looks almost like it is dirty from a oily hand but it doesn't wipe off. It is not a rectangular area. I am not familar with the common failure modes of Plasma displays. What is your best guess would cause this. Thanks in advance, Mike Since it only covers a non-symmetrical portion of the screen my guestimate would be the screen itself. Thanks for the insight Meat. These aren't affected by magnets the way CRT sets are they? Sorry for the stupid questions, but I have never taken apart, owned or even used a plasma display. I am only familiar with the VERY basic principles of operation and know it uses phosphors which are similar to a CRT but uses some other method to illuminate the phosphors. I guess uses some kind of micro printed circuitry similar to an LCD display, but I could be totally wrong about that. There is no convergance nor is there any concept of focussing. The pixels are fixed in size and location and nothing can affect that. That's the question I was wondering.. Thanks! I've got a little better idea of how this thing works now. Before it was all speculation. It was not unknown for plasma cells on older panels to develop a 'memory' of some bright content that had been displayed, resulting in a sort of visible 'stain'. In the worst case, this could cause permanent damage to the cells in the area, but often, the effect could be negated with a special service mode that did an intense white wipe of the panel. I'm pretty sure that modern panels don't suffer from this problem, and are much less susceptible to cell burn from high intensity static displays, but if the set is more than a few years old, it might be worth checking to see if there is a service mode that carries out a panel wipe. It may even be available as a user function through one of the menus. Have a read of http://en.wikipedia.org/wiki/Plasma_display For a good description of the principles involved Arfa If the screen protector was damaged by some solvent it would be easy to tell using a little oblique lighting -- Live Fast, Die Young and Leave a Pretty Corpse |
#21
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Plasma TV Foggy area
Michael Kennedy wrote:
I don't have this tv in hand now and also don't have the make and model of this display at the moment but all I am looking for is general information for now. This tv has a smudged / blurry area on the screen. It looks almost like it is dirty from a oily hand but it doesn't wipe off. It is not a rectangular area. I am not familar with the common failure modes of Plasma displays. What is your best guess would cause this. Thanks in advance, Mike Is there anything between the front of the plasma panel and the user? Dust/Dirt gets sucked in by fans and deposits itself on any available internal surface. |
#22
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Plasma TV Foggy area
"Mark Zacharias" wrote in message ... "Michael Kennedy" wrote in message ... "Randy Day" wrote in message ... In article , says... I don't have this tv in hand now and also don't have the make and model of this display at the moment but all I am looking for is general information for now. This tv has a smudged / blurry area on the screen. It looks almost like it is dirty from a oily hand but it doesn't wipe off. It is not a rectangular area. I am not familar with the common failure modes of Plasma displays. What is your best guess would cause this. Someone used solvent to clean the screen? Interesting idea.. That's a case where the screen could be fixed... I will have a close look at it in a couple of days. The price is right on this thing, but I don't want to sink money into it if the screen is about to crap out.. Since that's the one piece that cant be repaired. Lets not get ahead of ourselves - do we know for sure it's really a plasma and not an LCD? My customers often confuse the two. If not damage to anti-glare coating which has been suggested, it does sound more like an LCD type problem to me. Mark Z. To be honest Mark, I'm not sure that as described, it actually sounds like any kind of display technology fault that I have seen. I would be struggling to think of any kind of LCD problem that would result in an irregular smudgy-looking mark, unless it was an actual physical mark on the surface of the panel ... Arfa |
#23
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Plasma TV Foggy area
"Arfa Daily" wrote in message news "Mark Zacharias" wrote in message ... "Michael Kennedy" wrote in message ... "Randy Day" wrote in message ... In article , says... I don't have this tv in hand now and also don't have the make and model of this display at the moment but all I am looking for is general information for now. This tv has a smudged / blurry area on the screen. It looks almost like it is dirty from a oily hand but it doesn't wipe off. It is not a rectangular area. I am not familar with the common failure modes of Plasma displays. What is your best guess would cause this. Someone used solvent to clean the screen? Interesting idea.. That's a case where the screen could be fixed... I will have a close look at it in a couple of days. The price is right on this thing, but I don't want to sink money into it if the screen is about to crap out.. Since that's the one piece that cant be repaired. Lets not get ahead of ourselves - do we know for sure it's really a plasma and not an LCD? My customers often confuse the two. If not damage to anti-glare coating which has been suggested, it does sound more like an LCD type problem to me. Mark Z. To be honest Mark, I'm not sure that as described, it actually sounds like any kind of display technology fault that I have seen. I would be struggling to think of any kind of LCD problem that would result in an irregular smudgy-looking mark, unless it was an actual physical mark on the surface of the panel ... Arfa I will let you know if I finally get a chance to see this thing again.. I saw it very briefly and it wasn't a major flaw. Had I not been told about it, I'm not sure that I would have noticed right off. Seeing it I thought it was a very strange fault if electronic, but I haven't seen a plasma fail except in getting darker or burn-in. Anyway. . Hopefully I will see it tomorrow and solve this mystery. |
#24
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Plasma TV Foggy area
"Michael Kennedy" wrote in message ... "Arfa Daily" wrote in message news "Mark Zacharias" wrote in message ... "Michael Kennedy" wrote in message ... "Randy Day" wrote in message ... In article , says... I don't have this tv in hand now and also don't have the make and model of this display at the moment but all I am looking for is general information for now. This tv has a smudged / blurry area on the screen. It looks almost like it is dirty from a oily hand but it doesn't wipe off. It is not a rectangular area. I am not familar with the common failure modes of Plasma displays. What is your best guess would cause this. Someone used solvent to clean the screen? Interesting idea.. That's a case where the screen could be fixed... I will have a close look at it in a couple of days. The price is right on this thing, but I don't want to sink money into it if the screen is about to crap out.. Since that's the one piece that cant be repaired. Lets not get ahead of ourselves - do we know for sure it's really a plasma and not an LCD? My customers often confuse the two. If not damage to anti-glare coating which has been suggested, it does sound more like an LCD type problem to me. Mark Z. To be honest Mark, I'm not sure that as described, it actually sounds like any kind of display technology fault that I have seen. I would be struggling to think of any kind of LCD problem that would result in an irregular smudgy-looking mark, unless it was an actual physical mark on the surface of the panel ... Arfa I will let you know if I finally get a chance to see this thing again.. I saw it very briefly and it wasn't a major flaw. Had I not been told about it, I'm not sure that I would have noticed right off. Seeing it I thought it was a very strange fault if electronic, but I haven't seen a plasma fail except in getting darker or burn-in. Anyway. . Hopefully I will see it tomorrow and solve this mystery. Forgive me if this is a double post. It seems that it didn't work. I had a closer look at the TV today. It is a Hitachi W32-P5000. Upon closer inspection it appears that the "fog" is on the inside of the front glass. I can tell by looking closely and moving side to side. The pixels were obviously clear and the front glass is fogged. The next question is that if the front glass is attached to the Plasma display. If its not this should be an easy fix. |
#25
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Plasma TV Foggy area
On Mon, 06 Sep 2010 21:05:34 +0900, Michael Kennedy wrote:
"Michael Kennedy" wrote in message ... "Arfa Daily" wrote in message news "Mark Zacharias" wrote in message ... "Michael Kennedy" wrote in message ... "Randy Day" wrote in message ... In article , says... I don't have this tv in hand now and also don't have the make and model of this display at the moment but all I am looking for is general information for now. This tv has a smudged / blurry area on the screen. It looks almost like it is dirty from a oily hand but it doesn't wipe off. It is not a rectangular area. I am not familar with the common failure modes of Plasma displays. What is your best guess would cause this. Someone used solvent to clean the screen? Interesting idea.. That's a case where the screen could be fixed... I will have a close look at it in a couple of days. The price is right on this thing, but I don't want to sink money into it if the screen is about to crap out.. Since that's the one piece that cant be repaired. Lets not get ahead of ourselves - do we know for sure it's really a plasma and not an LCD? My customers often confuse the two. If not damage to anti-glare coating which has been suggested, it does sound more like an LCD type problem to me. Mark Z. To be honest Mark, I'm not sure that as described, it actually sounds like any kind of display technology fault that I have seen. I would be struggling to think of any kind of LCD problem that would result in an irregular smudgy-looking mark, unless it was an actual physical mark on the surface of the panel ... Arfa I will let you know if I finally get a chance to see this thing again.. I saw it very briefly and it wasn't a major flaw. Had I not been told about it, I'm not sure that I would have noticed right off. Seeing it I thought it was a very strange fault if electronic, but I haven't seen a plasma fail except in getting darker or burn-in. Anyway. . Hopefully I will see it tomorrow and solve this mystery. Forgive me if this is a double post. It seems that it didn't work. I had a closer look at the TV today. It is a Hitachi W32-P5000. Upon closer inspection it appears that the "fog" is on the inside of the front glass. I can tell by looking closely and moving side to side. The pixels were obviously clear and the front glass is fogged. The next question is that if the front glass is attached to the Plasma display. If its not this should be an easy fix. You'd have to get ahold of someone who has either tried to separate the front glass or who has successfully separated it. This is going to be a real challenge because it is not something that is normally done. I don't think I'd toss $160 at the owner either for the chance to find out on my own. -- Live Fast, Die Young and Leave a Pretty Corpse |
#26
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Plasma TV Foggy area
I'd get in touch with Hitachi today, or tomorrow at the latest (even though
"in touch with tomorrow" was Toshiba's slogan). I'm not so sure this is a case of the protective front surface pulling away from the panel. |
#27
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Plasma TV Foggy area
"Michael Kennedy" wrote in message
The next question is that if the front glass is attached to the Plasma display. If its not this should be an easy fix I would pass on this unless you can live with it as it is. I am definitely no expert but it sounds like and internally caused flaw or manufacture flaw that was not originally seen by the owner. |
#28
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Plasma TV Foggy area
"William Sommerwerck" wrote in message ... I'd get in touch with Hitachi today, or tomorrow at the latest (even though "in touch with tomorrow" was Toshiba's slogan). I'm not so sure this is a case of the protective front surface pulling away from the panel. My best guess by looking at it is something that is on the inside of the panel, but certainly not the actual pixels. It is definitely tolerable. If anyone saw it they would think the TV just needed to be cleaned in that spot. |
#29
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Plasma TV Foggy area
On Wed, 08 Sep 2010 01:47:51 +0900, Michael Kennedy wrote:
"William Sommerwerck" wrote in message ... I'd get in touch with Hitachi today, or tomorrow at the latest (even though "in touch with tomorrow" was Toshiba's slogan). I'm not so sure this is a case of the protective front surface pulling away from the panel. My best guess by looking at it is something that is on the inside of the panel, but certainly not the actual pixels. It is definitely tolerable. If anyone saw it they would think the TV just needed to be cleaned in that spot. The construction on the viewing side is a dielectric layer then the front glass. Sandwiched in the dielectric are electrodes. I think the front glass seals the gas cells so there would be no chance of removing it if this is the case. I don't know what the dielectric is made of, possible glass with an oxide coating. If that were the case one would assume that seals the cells. -- Live Fast, Die Young and Leave a Pretty Corpse |
#30
Posted to sci.electronics.repair
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Plasma TV Foggy area
My best guess by looking at it is something that is on the
inside of the panel, but certainly not the actual pixels. It is definitely tolerable. If anyone saw it they would think the TV just needed to be cleaned in that spot. It would drive me stark raving bonkers. |
#31
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Plasma TV Foggy area
On Tue, 07 Sep 2010 13:51:29 -0700, William Sommerwerck wrote:
My best guess by looking at it is something that is on the inside of the panel, but certainly not the actual pixels. It is definitely tolerable. If anyone saw it they would think the TV just needed to be cleaned in that spot. It would drive me stark raving bonkers. My son for some untold reason scratched the glossy protective cover on my 51" Panasonic rear projector. It was done with a pencil and maybe an inch long vertical. It took me a very long time to stop staring at that particular spot that wasn't anywhere near the center of the screen. I think too that it would be too much of a distraction for me to watch a set with a big smudge anywhere on the screen. -- Live Fast, Die Young and Leave a Pretty Corpse |
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