AE 700 Picture problem

It is the same problem as posted by me on January, but now I can describe it more precisely (because of the soccer world championship):

In "soccer-mode " there is somewhat like a line emerging from the lower left diagonal to the mid of the picture. It is visible especially when the green soccer field is projected, like green shifted slightly towards yellow. As this looks a bit lighter than the rest of the picture, this can not be dirt I think. It is also a very straighten line.
In a light grey picture this line appears as a slightly darker grey line. In respect of brightness vice versa to that in green areas! It has nothing to do with the screen as it moves according to lens shift adjustments. It is not a sharp line (more diffuse) but can be focused somewhat. Best visible at the optimal focus of the picture.
At other colors this line is also visible but more less. In native green, blue or red mode I can not recognise this line. My physical knowledge is not sufficient enough to identify the source of this phenomena within the optical system of the Pana. Can it be diffuse reflection? Is it from one of the panels, the prism, (dichromatic) mirrors or the entrance of the light into the optical system?

I hope my description is sufficient enough for the experts to find the cause of this problem.

Best Regards

Folketing

[paulfoley]

Is it a diagonal or vertical line? If its vertical then its almost certainly fixed panel noise or vertical banding. The latter can be tweaked out using the flicker adjustment (hidden in a secret menu). Fixed panel noise however is inherent in all LCD Projectors/TV's (& other displays). I see it on my AE500 but it only shows itself on green or grey backgrounds i.e. the fog scenes in Master & Commander or football matches/tennis.

I started to convince myself that I need to sell up & get a plasma or go back to a CRT. I then saw vertical banding in the background on a pubs plasma & on my brother in laws panasonic CRT (all showing football). I have found one solution - wear old glasses where the perscription is out of date or just sit back another 5 feet!

[The Fatty]

@paul - he said what way the line is going...lower left "diagonal" to the mid of the picture.

last time i checked bertical banding goes right the way across and is, well um...vertical lol.

your problem does seem very odd, i must say. can you take a picture?

[paulfoley]

Sorry got confused with the description. Now that is very odd! I googled the problem & found allsorts:

Somebody in Canada said he had seen "diagonal interference lines" & got round it by using DVI only. Another user got rid of the lines by switching output from his DVD player to 480p rather then 720P? One guy suggested it may be caused by a ground loop, have you tried powering the PJ with different sockets? You could also try some better screened cabling as I read that "Mains interference will often manifest itself in the form of diagonal lines right across the picture."?

Hope something here helps ?

Thanks for your opinions.

I just got a kind answer from Panasonic service. They said this would be a problem which could only be fixed in the workshop. They want to fix it by valid warranty although the beamer is 13 months.

I will report

Folketing

Service team said: all things within specifications, nothing to be done

How can I post a picture of this fault in this forum? Pictures say more than thousand words.....


Folketing

[sbowler]

With reference to the power supply, some guys using a UPS device report improvements in pic quality. I use one myself but cant say it makes a vast difference. Something to do with the UPS filtering out a lot of interference from the mains supply.

Hello again!

Here is a link to a picture taken with my camera. Because the ambitious light was very dark the photo is not very sharp.
Within the red box you can see the problem:

http://x5.freeshare.us/view/?117fs493878.jpg
http://x5.freeshare.us/117fs493878.jpg


In the meantime I opened the pj and cleaned the whole analysis unit with compressed air and took a look at all mirrors and polarizers. I could not see any abnormality on them. The line still exists after the procedure. As the best focus of this line is almost at the best focus of the picture, I believe the problem has to be close to one of the LCD´s. Moreover I think it has to do with one of the polarisers (in front or behind one LCD-panel) and not the lenses or dichromatic mirrors.
As I could not see anything at all, my problem is to distinguish the faulty polarizer now (I do not want to buy all of them. price is about 70Euros for one!!).
Has anyone an idea??
Thanx in advance

Folketing

[JorisS]

Have you tested using a different source input cable/signal and power output, as suggested above by some? Just to rule such factors out.

It looks a bit like when one would have a scratch on the lens... but I reckon you checked that? Also in that case, I guess that rotating the lens during focus would mean that the line would change location?

It's odd as the line is straight as can be, which normally wouldn't be the case for a scratch imho.... so an edge of some kind?

Sorry for the hardly useable post, just thinking a bit out loud. One never knows if it brings another to a bright new thought...

The line is not rotating while using focus and zoom (but the line is of course also "zoomed"). The outgoing lens system was also checked (I removed also two of the lenses and cleaned them. There are quite a lot of ways for dust entering the interior of the projection lenses. ..). I missed to tell that I already tested different inputs (scart, PC, s-vhs) with different "house-connections" for power supply. Moreover changing the picture aspect (16:9 to 4:3) has no effect at all.. -it is always the same on always the same area)
On the photo you can see the color-shifting. Perhaps a more experienced optical expert can distinguish the responsible filter/polarizer.

Folketing