Question about Panasonic PT L720E Multimedia Projector

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Panasonic PT-L720E For some reason we have a green tinge from the bulb. If you have nothing coming throught the projecctors there is a green tinge and it seems to go from the bottom up. Any ideas why the bulb is not old but has been sitting for a year unused.

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  • chestrfield Apr 27, 2009

    Hi i have the same problem, when my PT-l720E is a large circular glow of green right in the centre of the image being viewed. I have checked the lamp and seems fine. And even before any cables are plugged in the greem still remains so cant be cable problem. Infact when the projector is switched off and you look right into the lens it a greenish colour that i can see at the back of the lens.

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Normal 0 Im not sure if you are still looking for thesolution to this - i may have some info to aid, but im afraid its not acomplete solution!

Basically it sounds to me (as i have the same problem with the same unit) thatone of the LCD polarisers has melted. inside the light engine, beneath the motherboardat the very centre of the unit there are three screens, Red green and blue,measuring 22.86 mm diagonal (type 0.9). (there is no known part number - buton mine are the letters printed " TEEC5079 >PC< "
They are mounted on small plastic arm brackets and screwed/aligned meticulouslyinto place. if one of them melts (i.e. the coloured surface attached to themmelts)then you get colour problems and blob like bleeds on the image projection.My display was showing a purplish/bluish bleed on the screen, and when i checkedout the RGBs i saw that the red had almost completely burned and melted. Theglass was intact, it was the red surface that had melted.

Unfortunately it is EXTREMLY difficult to get one of these parts. I have beenon the phone to Panasonic at least 12 times, and also been in my local store. Ihave found that they:
a) don’t know anything about the part in question
b) don’t know the part number
c) are unwilling to talk to a single consumer (as this is a business product)
d) will likely forward you to a 3rd party electronics company (who will referyou back to Panasonic arghh!!)
e) Will pass you from call centre to call centre, from Britain to India
f) will not reply to emails, as i have sent 3 over a month ago

The only solution i can think of, and am currently attempting is to use a red camerafilter on the screen. (do a search for “cokin” or “hoyle” filters on ebay alongwith colour required)I have carefully removed the burned remaining residue fromthe LCD screen, so its just a clear piece of glass now. there are no scrapes (iused my fingers/nails as opposed to a tool, which could scrape the surface) andi cleaned the glass with a micro fibre clothe (you can get these from anyoptician)

I went out and purchased some camera filters - in my instance it was red. redis generally used for people taking black and white pictures - to add depths tothe spectrum. anyway i now have a bunch of red filters, some are gel - meaningthey are like plastic sheets that you can attach, others are glass. its now ajob of trying to accurately attach the filter to the clear screen (bare in mindthis thing is 22.86 mm) then refitting.

problems are - how to accurately attach the filter without any defects on thesurface (high temp oven glue perhaps? up to 260 degrees c)
-temperature - inside the light engine it gets really hot, so it is possiblethe filter may burn instantly

I would appreciate any feedback or suggestions on this matter. I have tried toattain this part abroad as well as at home - its near impossible.

many thanks in advance.

Paolo A
Glasgow

Posted on Nov 08, 2008

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To Paoloman,

I have this same problem and I purchased some heat resistant color gels from a theater supply company and put a red filter in place. Well after about 30 seconds you could see the picture change colors. I turned it off and the plastic filter had warped and melted a little.

Anyways just wondering if you found a solution.

email me back if you see this, jakenutt(at)gmail(dot)com

Posted on Apr 06, 2010

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Hi thebeach

This is most definitely not your lamp that is causing this.

It could however be a whole number of other things like the LCD's or the Mainboard.

Rather take it step by step.

Have you tried using a different cable yet ?

If you have and this persists , try checking if this occurs on a video input as well.

If it does , then this could be a faulty Mainbaord , that will either need replacement or repair.

Posted on Apr 30, 2008

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