Plasma panels and heat.

DigitalJunkie · 24th November 2009, 09:13 PM

Hey guys,

I've got a Daewoo plasma TV here,it's defunct,but a new logic board should fix that.(I hope- PSU and everything else checks out.)I'm more concerned with this green coloration on the screen,I'm wondering if plasma's are sensitive to heat?
Here's a video of the beast: YouTube - Daewoo plasma on acid?
Might those green areas be caused by excessive heat? The sustain boards are behind those green areas,and I'm wondering if that could be caused by something other than a faulty logic board,like heat,magnetic fields,etc?
In other words,is it likely to be a problem with the plasma display itself?
It might just be artifacts from the FUBAR logic board,but I'd like to be sure.

Cal Weldon · 24th November 2009, 10:13 PM

Well I can't speak for plasmas as mines not old enough to know yet but the old JVC D-ILA system (liquid crystal on silicone) is affected by heat. The left side that turned green is closest the gas fireplace and the right side, still purplish is away from the heat. (progressive colour change) I'd be interested in what others have to say also.

peanut123 · 5th January 2010, 11:58 PM

Yes, Plasmas and LCDs are both affected by heat.

sheldonstv · 22nd April 2010, 11:57 AM

depending on model that could be an expensive repair.....ysus and zsus could be faulty +the drivers.....these boards are not repeairable unless you have the necessary repair experience ant tools for surface mount repair....also you may have a faulty ssb panel too.
thing to do is obtain the service manual for this set and go from there ...
one more item that may be faulty is the pdp itself due to failure of sm parts on the cof connectors themselves -in which case yr set is scrap....

DigitalJunkie · 22nd April 2010, 12:41 PM

I did manage to get this set working,very briefly. I found the service manual online,and checked/adjusted the voltages for the display panel (they were fairly close to what was marked on the sticker on the back of the panel,but not exact),and checked a few other things.
Then it suddenly went into fits,and started blowing the scan driver chips..then it suddenly popped one of the COF chips,and it's associated resistors.. it's FUBAR.

This thing has been a headache from day 1,almost like it's possessed!

24th November 2009, 09:13 PM	#1
DigitalJunkie diyAudio Member Join Date: Apr 2003 Location: Portland,Oregon Blog Entries: 4	Plasma panels and heat. Hey guys, I've got a Daewoo plasma TV here,it's defunct,but a new logic board should fix that.(I hope- PSU and everything else checks out.)I'm more concerned with this green coloration on the screen,I'm wondering if plasma's are sensitive to heat? Here's a video of the beast: YouTube - Daewoo plasma on acid? Might those green areas be caused by excessive heat? The sustain boards are behind those green areas,and I'm wondering if that could be caused by something other than a faulty logic board,like heat,magnetic fields,etc? In other words,is it likely to be a problem with the plasma display itself? It might just be artifacts from the FUBAR logic board,but I'd like to be sure.

24th November 2009, 10:13 PM	#2
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	Well I can't speak for plasmas as mines not old enough to know yet but the old JVC D-ILA system (liquid crystal on silicone) is affected by heat. The left side that turned green is closest the gas fireplace and the right side, still purplish is away from the heat. (progressive colour change) I'd be interested in what others have to say also. __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

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5th January 2010, 11:58 PM	#3
peanut123 diyAudio Member Join Date: Aug 2008	Yes, Plasmas and LCDs are both affected by heat.

22nd April 2010, 11:57 AM	#4
sheldonstv diyAudio Member Join Date: May 2005 Location: united kingdom	depending on model that could be an expensive repair.....ysus and zsus could be faulty +the drivers.....these boards are not repeairable unless you have the necessary repair experience ant tools for surface mount repair....also you may have a faulty ssb panel too. thing to do is obtain the service manual for this set and go from there ... one more item that may be faulty is the pdp itself due to failure of sm parts on the cof connectors themselves -in which case yr set is scrap....

22nd April 2010, 12:41 PM	#5
DigitalJunkie diyAudio Member Join Date: Apr 2003 Location: Portland,Oregon Blog Entries: 4	I did manage to get this set working,very briefly. I found the service manual online,and checked/adjusted the voltages for the display panel (they were fairly close to what was marked on the sticker on the back of the panel,but not exact),and checked a few other things. Then it suddenly went into fits,and started blowing the scan driver chips..then it suddenly popped one of the COF chips,and it's associated resistors.. it's FUBAR. This thing has been a headache from day 1,almost like it's possessed!