image burn plasma

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CR45HER

11 posts

Geek

#28422 29-Nov-2008 00:10

Can anyone please help me with a HTPC problem

would anyone have any idea why a
panasonic viera TH-42PY800, heats up while in desktop mode browsing,

folders or internet, just your normal desktop stuff, and you can still

see the words faintly after you close the aplication, its really

noticable becouse i have a black desktop, but yet when we are watching

freeview, its sweat as and stays cool, but things like the C4 and outher images that stay still for a while,
stay longer than ment to, im runing hdmi cable from

AsusEN8800gtx to hdmi1 on the tv

Computer specs are:
Asus p5b deluxe, Quadcore 2.5, GP card AsusEN8800gtx, 4gig ram, vista

64bit, 4x500 gigs, termaltake 600watt psu

sbiddle

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#181024 29-Nov-2008 06:24

This is normal for a Plasma. They do heat up and "ghost" images will appear for some time after things with bright contrasting colours appear on screen.

The only real issue is if you are leaving the same image in place for extended periods of time, you will then experience screen burn which can't be fixed.

CR45HER

11 posts

Geek

#181027 29-Nov-2008 07:32

Thanks for your reply, i thought the TH-42PY800 model, did away with this, what i might do is put a txt document on a memory stick and take it into town and try it on the same model see how it holds up, i dont know why i didnt think off it earlier

sbiddle

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#181033 29-Nov-2008 08:36

It's something that is happens with every Plasma TV - there is nothing wrong with your TV. It is not permanemt image burn.

To quote Wikipedia

Plasma displays also exhibit another image retention issue which is sometimes confused with burn-in damage. In this mode, when a group of pixels are run at high brightness (when displaying white, for example) for an extended period of time, a charge build-up in the pixel structure occurs and a ghost image can be seen. However, unlike burn-in, this charge build-up is transient and self corrects after the display has been powered off for a long enough period of time, or after running random broadcast TV type content.

Image burn on the other hand does still occur though but it's nowhere the issue it used to be. For day to day use it's not going to affect you. Use a plasma for a display and leave a news ticker bar running continuously (such as CNN or Sky news) and you will see image burn over time.

As for the heat problem that's perfectly normal as well. Plasma TV's always run very warm. A 42" Plasma is probably sucking through ~300W when running. That energy has to go somewhere!

CR45HER

11 posts

Geek

#181207 30-Nov-2008 09:29

Thanks, Do the big 42"+ LCD screens have the same issue with ghosting and image holding,

sbiddle

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#181219 30-Nov-2008 12:14

CR45HER: Thanks, Do the big 42"+ LCD screens have the same issue with ghosting and image holding,

Yes. All LCD's and Plasma's have this issue. The term is actually image persistance.

LCD's don't suffer from permanent screen burn however like Plasma's can.

Masterpiece

247 posts

Master Geek

#181837 3-Dec-2008 17:53

THe main issue is that PC content is quite often at max or near max output.

ie 0,0,0(Black)~255,255,255(White) Where a great proportion is running above 200.

This is significant because video is 16(black)~235(white) with a typical signal level of 40~75%, ie middle of the range overall with typically short periods at high luminance levels.

THis is why Plasmas and PC's aren't a good combination for long periods, they are designed for video inputs.

Static txt and Plasmas don't mix, once pixels go past the retension stage they enter burn which actually means those pixels are aged compared to the surrounding pixels. They are in effect dimmer when burned. Retension actually as discribed holds the charge and stays luminace, thus more evident in dark images.

If you have the option, set PC outputs to video.

Run movie mode.

Use screen savers.

Remove idle short cuts and other stuff off the desktop.

Set the start bar to disappear from view when inactive.

Me:"I'm not a robot!"

ET: "Maybe; you have some freewill, but you chose your path by arrangement"

Me "That sounds like a program with no freewill?"

ET: "We will catch up when you end this cycle"

Me: "Sounds like a 'KPI'!"

ET: "Did you read the terms and conditions?"

Me: .....

CR45HER

11 posts

Geek

#182361 5-Dec-2008 19:12

Thanks for that, its a great help and confirms what i suspected