TVs & Home Theaters forum

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hot spotting, on dlp, lcd r p tvs

by rhpoolshark / September 30, 2005 1:42 AM PDT

hi everyone, need some advice/ was all set to get a new modle sonny 50" rp, but i was checking it out, and when i turned the set off, it had a white blurr in the center of the screen?, so i checked all of the rear projections,same thing/ some worse ? any ideas? and will it get worse, over the years? mebby sears guy knows? the salesmen didnt have a clue, but they could see it too. thanks any help will be great

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Where have all the physicists gone?
by R. Proffitt Forum moderator / September 30, 2005 1:55 AM PDT

The oddities of what you may see on screen during power up and power down could be explained by an electronics engineer or most physicists. But today's consumers may take such normal effects as a sign that something is wrong. I had some thinking that a certain lighting system still used electrical power when turned off because of the afterglow.

Sorry, but if the vendors can't see their way to explaining how TVs and such work, you'll have to hit the web on sites like to catch up on electronics, projection systems and more. I can't condense all that you need to know in this small space.

-> In short, it's normal.


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hot spotting or gosting
by rhpoolshark / October 2, 2005 2:16 AM PDT

the white image that i saw on the rear projection tvs, all of them, wasnt when you powered up or off, you can see a round white blurr, about the size of a grapefruit, in the scerrn no matter how long they have been turned off, if youre sitting in your dining room, and look at your new tv in the living room, the first thing you will see is a white image in the screen? you will think something is wrong ? does sears guy have any idea? and will the gosting get bigger,and brighter over the years. thanks

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Depends on the design.
by R. Proffitt Forum moderator / October 2, 2005 3:53 AM PDT

I don't have enough about the model to write either way but my projection unit will have that normal glowing grapefruit for some number of minutes and I see it dissipates with time.

If this bothers you then don't buy it.


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hot spotting, on dlp, lcd r p tvs
by jcrobso / October 3, 2005 1:47 AM PDT

Well on some CRT TVs when you turn the set off there will be a small round fuzzy circle as the set dissipates the residule charges, this will last for a few seconds to a minute or so depending on the set.
This would also be true for CRT rear projectors.
Now keep in mind that on projection TVs room light can go throuh the screen and reflect off the mirrors inside and bounce backout. You would never be able to see this when the set is on, but when it is off you can. John

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rear projectiom, spotting
by rhpoolshark / October 3, 2005 2:43 AM PDT

hi, i was thinking the same thing might cause the large white spotting, but we stood a few feet back from a tv that had been off for a coupple of days, same thing, then we could make the blurr out in dark seens, like landscapes that panned slowley across the screen, we tried blocking any light ,same thing? Ron

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Since the unit is off, why is this an issue?
by R. Proffitt Forum moderator / October 3, 2005 2:45 AM PDT

Just wondering.

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we tried blocking any light ,same thing?
by jcrobso / October 3, 2005 3:31 AM PDT

You would have to be a completly dark room no light at all,, But I agree with Bob, the set is off... John

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