Panasonic PT-AX100U Tweak/Calibration Thread - Page 7

Originally Posted by mflanagan

Im going DVI out from an Oppo DVD player. Hopefully your source can help you thru some troubleshooting steps.....let us know what you find out. Also you may want to try a Minimum setup (1 cable then add on) to try to narrow down your problem.

Originally Posted by Xander

I can confirm that I get the exact same ghosting as what you are. I'm using a DVI->HDMI cable feeding from my Radion 9000 HTPC. I can now see that it is for this precise reason that I stated in one of my other posts that my AE500 was probably marginally sharper when viewing the windows desktop. I would be very keen to get a resolution for this issue.

Originally Posted by mflanagan

Do you get ghosting when looking at text in the Panasonic's menu or just from a windows desktop?

Originally Posted by tvted

Just curious, is your Nvidea card of recent vintage? I had similar issues with my 700. I was utilizing two different Radeon cards - the 9500 PRO and the 9550. It wasn't until I upgraded to a NVidea 6600GT that the problem went away.

ted

Originally Posted by HiHoStevo

The 63% is measured from the center of the screen..........

Originally Posted by ctviggen

63 percent of whatever the height of screen is.

Originally Posted by ctviggen

I think we really need a FAQ to answer this question, as it's asked over, and over, and over. (And I can see why, as it is confusing.)

63 % is 36 inches. This means that you can put the centerline of the the lens 36 inches above the centerline of the height. As the difference between the centerline of the height is 58/2 or 29 inches, you can put the centerline of the lens at 36-29 or about 7 inches above the top of the screen. I say "about" because we performed some rounding, so there's another half inch or so in the "real" calculations.

Make sense?

To further confuse things, 63% is 13% more than 50%, which means that you can put the centerline of the lens 13% of the height of the screen above the top of the screen. 13% of 58 is 7.54 inches, which means you can put the centerline of the lens 7.54 inches above the top of the screen. This is exactly what we get using the calculations given above (if we didn't round down, that is).

These are two different ways of looking at the same thing.

Originally Posted by zee12

Hi All,

Let me try, since I am in the same situation I think I know what he is asking. He has a LOW ceiling.

The answer is that you can mount the projector UP TO A MAXIMUM of 7 inches above the top edge of the screen. The closer you get it to dead center of the screen the better.

So if you can have it lower than the top of your screen do it. If you cannot, you can go no more than 7" above the top edge of your screen.

I am currently installing the AX in the same type of low ceiling situation (7'6") ceiling with a 120" screen. It is mounted on my ceiling about 3" down from the top edge of the screen and am experiencing excellent results. Convergence is almost bang on.

Hope this helps,

z

Originally Posted by caesar1

How far is the lens itself from the ceiling, due to the mount and the projector body?

Originally Posted by Steve McRae

Yes - I have tried this with a HDMI connection straight from a Pioneer DVD player and the image is mint. =)

When it is done through a DVI/HDMI connection straight to a computer, you see the horizontal ghosting.

..........



I am beginning to suspect that this could be some issue with DVI / HDCP and Panasonic? At this point, I could not recommend this projector to anyone who plans to digitally hook their HTPC up to it. In that sense it has been a great disappointment for me. Fantastic image right from a DVD player however. . .

Originally Posted by zee12

About 22" to lens center.

z

Originally Posted by caesar1

Almost 2 feet? That sounds like a lot. Is that on a pole?

Originally Posted by Steve McRae


I am beginning to suspect that this could be some issue with DVI / HDCP and Panasonic? At this point, I could not recommend this projector to anyone who plans to digitally hook their HTPC up to it. In that sense it has been a great disappointment for me. Fantastic image right from a DVD player however. . .

Originally Posted by Ballan

This makes me nervous as all my video will come from an HTPC. Is anyone getting a sharp desktop with HDMi? If so which video card are you using and which adapter are you using? My PX-100 is on the way . . . .should I cancel my order?

Originally Posted by Steve McRae

There seem to be alot of experienced people here and I am hoping that I can get some help.

I am a noob to the world of projectors. I recently purchased a ax100. I was waiting for some cables from monoprice to come so I hooked it up to my older pioneer 480i dvd player. The image quality was impressive to my eye.

My cables arrived from monoprice and I hooked up my HTPC via a DVI / HDMI converter to a 35' HDMI cable.

I noticed first that movies played full screen did not have the same 'pop' that the 480i dvd player has.

Even worse I am getting some strange ghosting around pixels in certain circumstances as seen in the images below. Notice that the 100% image has no ghosting. You can see the ghosting most clearly in the 70% image. This is extremely disappointing for me as the HTPC was going to be the primary source for the projector.

Any time you have white or black text on grey background, you see this problem.

The video card is a nVidia and outputing at 720p and the photos are in perfect focus.



Is there something wrong here? I read in the manual that using DVI / HDMI adapter is not recommended - is this the reason why? Are there any techies that have any insight into this strange problem?

Originally Posted by Steve McRae

JHouse - good tips

mflanagan - here is what I know thus far:

a) The effect happens when the computer is putting out 1280x720 (native resolution). It may happen at other but this is really the only resolution that I care about. =). The 'artifact' or 'ghosting' is very precise and would be harder to detect when using a non native resolution
b) The effect does not happen when you use a vga cable (or rather, you could make an argument for seeing some of the artifacts but you can sort of tune it out using some of the menu options (dot options etc.).
c) The effect is not seen when watching dvd video through the same HDMI cable. However the DVI/HDMI cable adapter is not being used in this setup.
d) The effect is seen when using a $50 monster DVI/HDMI adapter. There seems to be no difference between the monster adapter and the $5 monoprice one.
e) I have tried two different video cards (5700 Ultra and 7600 GS) - exactly the same result on both

Because the signal is digital, I would not think that you would see this ghosting in this manner. The ghosting is also very precise, it is 2 pixels on either side. The 70% image demonstrates this well - look at the '7'; on either side of it you can see another '7' in white.

A question for you mflanagan: do you have your projector using the DVI/HDMI adapter hooked up to a computer or a DVD player?

Originally Posted by Steve McRae

There seem to be alot of experienced people here and I am hoping that I can get some help.

I am a noob to the world of projectors. I recently purchased a ax100. I was waiting for some cables from monoprice to come so I hooked it up to my older pioneer 480i dvd player. The image quality was impressive to my eye.

My cables arrived from monoprice and I hooked up my HTPC via a DVI / HDMI converter to a 35' HDMI cable.

I noticed first that movies played full screen did not have the same 'pop' that the 480i dvd player has.

Even worse I am getting some strange ghosting around pixels in certain circumstances as seen in the images below. Notice that the 100% image has no ghosting. You can see the ghosting most clearly in the 70% image. This is extremely disappointing for me as the HTPC was going to be the primary source for the projector.

Any time you have white or black text on grey background, you see this problem.

The video card is a nVidia and outputing at 720p and the photos are in perfect focus.



Is there something wrong here? I read in the manual that using DVI / HDMI adapter is not recommended - is this the reason why? Are there any techies that have any insight into this strange problem?

Originally Posted by xnaron

Ok I have the ax100 hooked up via dvi to hdmi using my radeon 9800 ati card. As soon as I read this post I had to see if I had the same problem.... well I did. Mine was easily seen is the ati catalyst control center on the display options screen where there is a lot of black text on gray background. I immediately went to the projector menu on the ax100 and started playing around with settings trying to get rid of the ghosting. Well I found something that WORKED! I went to options and then aspect ratio and switched away fom 16:9 and then back to 16:9. When I switched back to 16:9 ghosting was completely gone. Someone else please try this out and let us know if it works.

thanks,
Brendin

Originally Posted by Steve McRae

This is GREAT news - so we know that it is something to do with the signals that PC's are sending out and that perhaps that the projector is not interpreting them properly. At least we now know that it can be fixed in software at some level.

Originally Posted by xnaron

I'd like someone else to try it to confirm....

I left the projector on and powered down my HTPC completely off. I turned it on and booted into xp. I went to the catalyst control screen and ghosting was again there as I expected it would be. I used the aspect button on the remote and cycled through the ratios till I got back to 16:9... ghosting is gone! Changing aspect ratios must make the projector resync correctly to the PC.

Brendin

Originally Posted by Steve McRae

it worked, it worked, it worked!!!!

thank you very much - I can now enjoy HTPC bliss as originally intended =)

Originally Posted by Steve McRae

wow - so it was the remote aspect ratio that you were playing with, not anything in the ATI drivers?

Originally Posted by jazjon

Wow, hey what's this ax100 talk doing in the +$2500 projector side of the house?

DVI ghosting issues? Interesting..............

I'm going on 100+ hours, and everything looks good via HTPC(DVI-HDMI) and XBOX 360(COMPONENT). XP Desktop is sharp.

I'll need to do a complete black/white image test like the images below to see if I have ghosting that I didnt notice yet. I have a slight astigmatism in my left eye so that doesnt help either. I'll look up close and take photos when I can.

Here is my complete HTPC setup. (I use a 50 foot monoprice HDMI cable)
I run everything through my HDMI AVR. (720p)
http://www.avsforum.com/avs-vb/showt...43#post8842043