Sharp 10k edge ghosting, wired picture

Second Pic

my first screen shot. No my camera was not level sorry. i was hand holding it. Yes I am still tweeking my colors. I just started.


But I will take ANY suggestions or comments good or bad.


you can see the ghosting ot line in bewteen green and magenta.

Check the seating of the RCA connectors very carefully. If one of them has worked loose, it can cause this kind of bleeding or smearing. If the outer ring of the RCA connector (the shielding) isn't secure but the central pin (the signal) is in contact, you get what looks like color-bleed or ghosting.


If all the cables are completely secure and tightly plugged in at both ends, then there may be a problem with the shielding of the cables themselves.


Try this experiment: Move your DVD player close to the projector and connect it with a set of short (like 6 foot), good quality cables. If the ghosting/smearing/bleeding goes away...you know you've got cable problems.


You don't have to spend a fortune for cables of 50 feet length, but at that length you should use component cable that is constructed from three separate RG6 cables or the equivalent, as you say you've done. But if you terminated those yourself, or used "plain old" RG6 from the parts bin, they may not be up to the task. Take a look at BlueJeansCable.com or BetterCable.com and figure on spending a couple hundred $U.S. Compared to what you've already spent to create and project a great picture, it's not too much to spend to transmit the picture.

-H.

Consider upgrading your cable. I had a hand created RG6 based set of RGBHV cables I had been using for my CRT projector. When I changed over to my Sharp 10k, I reused them and was really unhappy with the clarity. Granted, I had a 25' run, but still. Electrically & mechanically, the connections were good (I make a lot of cables and do a fair amount of testing, so I have at least some confidence in them).


I went to BetterCables.com and got the silver serpent reference line. The result was really, really remarkable (like night and day). It hurt to pay for those cables, but again, the result was spectacular.


On the shorter cable runs, consider higher quality cables too. Originally, I had my Sony 300 DVD player going to my 10k over that BetterCables cable and was thrilled. Then I added a HD cable box and wanted my pre-amp (a Rotel 1066) to switch the component (I didn't want to run two component cables to the projector).


Running the DVD player into the preamp and then to the projector created quite a noticeable degradation of the signal I put the fault on my preamp, but everyone I talked to said that Rotel component switching was very good and shouldn't introduce any artifacts. Then they suggested the cables might be at fault.


I scoffed at that - I had 1m/3' monster component cables from the player to the preamp - there was no way such a short run with a reasonable (though not great) cable brand could cause this. But, after two weeks of trying, I finally decided to test this out and ordered a 1m/3' silverserpent from bettercables.


Well, as you are probably already suspecting, all the noise and crap in my picture went right away. In fact, with the signal going from the DVD player to the prre-amp and then the projector I could not see any diff in picture vs a straight DVD->Projector run.


I am *not* a fan of expensive cables. I honestly think that for regular audio signals, a reasonably good cable is more than enough. For speakers, 12 gauge stranded copper is fine. At the very low frequencies audio operates on (relative to video), these are more than fine and all the extra stuff is, IMHO, a waste.


But I am now a believer on using quality video interconnects - especially when routing HDTV class signals around. BetterCables was a good company to deal with and their reference line are pretty nice. You may get the same from a less expensive cable and it's probably worth checking it out. For me, since things were so bad, I decided to start "at the top" and once the result was so great, I didn't want to risk going back

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That could be a factor, depending on what "right next to" means in distance from the sub's magnet and electronics. My component cables pass about 1 foot from the back of my Revel sub (110 pounds of box and magnet!) and I see no ill effects, but your situation may be different. You can easily experiment by disconnecting and moving the sub away from your cables while you view the screen. It'll either make a difference or won't. If it does make a difference, you may not have to move the sub very far, since I think the magnetic field strength decreaes as the cube of the distance.


Again, good cables with impeccable shielding may well reduce any interference danger from the sub.

-H.

gduprey, sorry if my post was inflammatory.


Seriously, I doubt this is a cable issue. Having used VE and DVE on my HTPC and LG DVD player--both connected to my 12K via a high quality 6' DVI cable and set to 1:1 pixel mapping at 1280x720--I can tell you that the source is the culprit. DVI can fall victim to certain digital artifacts, especially over long cable runs, but it certainly isn't susceptible to ghosting or ringing when set to the native rate of the display device and the display device truly passes the signal unprocessed.


When connecting analog sources, the Sharp does employ edge enhancement to a degree, but this can be mitigated with the sharpness control. Since Horta has already tried that and it didn't fix the problem, I'm convinced that this is just the poor quality of the test pattern being revealed by a high quality display. As he said, the same pattern in Avia looks better. No reason for the same test pattern to look better unless there's a difference between the quality of the program material itself.


If he can return the new cables at no cost, he can certainly try them out. I don't think he'll find that it fixes the issue.


Honestly Horta, I think you should invest in a cheap DVI player capable of upscaling to 720p along with a decent 6' DVI cable. It's not a 300 disc changer, but if you spend that much on a projector, you should pair it up with a source of similar capability. Just don't be surprised when you see the same issues

Hey All


Well I have been playing around with my 10k. I must say yes this ghosting thing is weird but I have an Amazing Picture when watching a regular movie and not using test patterns. I have notice the ghosting lines do become more or less obvious depending if I am using VE or DVE or Avia. Sometime more prevalent sometimes not. I do also see them when I pull up the THX Optimode test. I do believe this issue has to be impeding my PQ somewhat but like I said when watching a movie PQ is awesome.


I did find out my Sunfire Sub was totally the cause for the full screen with of faint horizontal lines on my screen. I was noticing the lines but then realized it was ONLY when the sub really hit. SO last night I just pulled the cables Off and away from the sub and the little faint line were no longer there when I played back the same scene. Very cool. This weekend I will relocated my Sub to the other side of the wall unit. No I'm wondering if the magnetic interference could be the cause of some of the weird ghosting I'm seeing.


I 'll now more this weekend.


Thank you all so far for your ideas and suggestions. AVS is a true asset to this crazy, expensive, time consuming hobby of ours!


Jerry