Wasn't sure which forum to post this in, but since RPTV owners are the ones most likely to be affected, I thought I'd post here -
There is a problem with upconverting DVD players and certain model TVs (especially CRT RPTV sets). I have found very little about it in all my net research and hope that someone may be able to offer some insight.
Basically, the 1080i component output of certain DVD players is the only way that those of us with non- DVI / HDMI sets can watch upconverted DVDs. Problem is, when there is a bright scene, flash of light (like an explosion) or sometimes simply high contrast, the picture becomes unstable. Some people describe it as flashing, some say it looks like v-hold instability, or jittering etc..
Some have reported their TV loses signal entirely, but I haven't determined yet whether or not this is the same, a related, or separate issue.
This only seems to happen with upconverting DVD players, other 1080i component sources such as DVRs and DVHS players don't cause the problem. Don't know if it occurs in 720p since my set doesn't have that option.
Obviously, we can solve it by switching our DVD players down to 480p, but who wants to do that?
Here is the information I have gathered on the problem so far:
The Avel Linkplayer 2 by IO-DATA has this problem, as does the OPPO model DV-970HD. Maybe so do all upconverting DVD players, but those are the two I've tested personally.
The TVs that exhibit this problem seem to be:
Mitsubishi WS65819 (the one I have)
Phillips 32" 720 panel
Sony XBR (non-RPTV)
Possibly many more, but these have all been mentioned specifically.
Examples of DVDs that caused the problem (regular store bought DVDs, not copies or streaming files) -
Gladiator - Balls of fire crashing into trees in the opening battle scenes.
Pirates of the Caribbean - Cannon fire when the Black Pearl arrives in Port Royal at night
O Brother Where Art Thou? - much of the movie, possibly due to high contrast?
Chronicles of Riddick - opening net gun chase.
Any scene from any movie that cuts to a bright shot of mostly sky, snow or sand. Black text one white background.
Here is some input so far that others have given:
"My problem only occurs on the Linkplayer whether or not it is connected directly to the TV or not. The other HD components do not do this no matter how they are connected. I believe the player is exceeding the 1080i timing specifications and my Mitsubishi is old enough that it must have tighly conforming signals at 1080i. I'm still requesting that IOData allow the user to adjust the video timings like many of the other netwroking players do. I should be able to adjust the image so that the overscan is reduced and adjust it to the left, right, up, or down to best match my TV. All this capability is within their chipset, other similarly based network players are doing it now and don't have this problem."
"bigDvette wrote: (2/1/2006)
Well, I can tell you my experience with this and I have just fixed it in the last week. I saw this ever so slightly on my Sony XBR (non RPTV) on bright scenes. I was also seeing this with my HD Tivos. It only shows up in 1080i and if you go to 480p it goes away.
I purchased this box before Christmashttp://www.video-storm.com/proddetail.asp?prod=CRM84
and it made the issue worse. Luckily this was a new product for video storm and I was working with the guy because there was a few firmware issues. Luckily it made the issue so bad I made it my mission to fix. Now on my Samsung 5078w (brand new 1080i set) I did not have this issue. I had 3 source components that made my Sony TV do this (both Tivos and the AVEL). This did not happend with the XBOX or the OPPO DVD player.
In working with the video-storm tech (very nice guy) we realized this was happening with all the AC Coupled sources. Most CE products are DC Coupled so they sync on a DC signal. AC Coupled devices are prone to ground loops, but they also don't suffer from distribution as much because they don't require DC Restorization to keep the signal strong.
Anyway, he modified the firmware on the switcher a few times to try and adjust the clamping speed (the speed that the signal syncs) The Switcher was operating even faster than the TIVO or AVEL so it was making the problem worse. We slowed it down and it made it a little better but any bright transtion on CSI or Las Vegas or movies where there is fast movement with bright transitions like on CSI where the go white during scene transitions made the TV flash bright to black.
We couldn't get this to go away and I got fed up a few nights ago and decided to go in to the service menu on the Sony. I ignored all the color settings and adjusted everything else 1 at a time. I came across a setting on the Sony called HSEP. I changed the value from 0 to 1 and that clipping as I called it went away completely. I was using the AVEL to test and kept FF and REW over a scene that was predictible.
I then found this documenthttps://www.vancebaldwin.com/shop/re.../KF42WE610.pdf
and it had a diagram of the TV board and what HSEP controlls. I sent it to the video-storm tech and when he looked at the diagram his comment was:
Great find on the HSEP control! It looks like it is controlling the sync seperator, probably changing the clamping currents to the bi-level setting (which is faster). That should be a good way to correct this.
Anyway, that fixed my problems. no more TIVO problems or AVEL problems on the Sony in 1080i.
I hope this helps in some way. I had to change it for each input while the TV was viewing a 1080i source. Maybe these other TVs have a similar setting. In reality it is both a TV and source issue because they use incompatible sync seperator value.
I'm hoping someone at AVEL can comment on what kind of setting the AVEL uses as that might help some people talk to a tech for their TV and see if there is a like setting on their TV."
As far as input from the player manufacturers -
IOData stated that they were working to fix it in a future firmware update, but that never happened (that was a couple years ago).
Oppo just told me on the phone the other day that they are aware of the problem but that it relates to inadequate power supply in certain sets and there's nothing they can do about it.
So, that's where I'm at. I don't remember anything in the service menu of my MITS relating to HSEP so trying that is not an option (maybe there's a similar control called something else?). Would love to hear from a calibrator as to whether or not this problem can even be fixed. This is a major issue for me and if it can't be solved it might mean that I can no longer properly enjoy my lovingly calibrated RPTV.
I can live with no DVI/HDMI for a while, and my set has many good years left on it, but now that I've seen how good upconverted DVDs look in 1080i, my choices might be down to going back to 480p (yuck) or buying a new set (ouch).