CurtPalme.com Home Theater Forum

[CIR Engineering]

One of my clients has a Madrigam MP9 that is having a problem. The photos below explain it all. The issue occurs only at 72Hz. The resolution is 818x1920 @ 72Hz and I am running it with 930x2200 total pixels. Anyone have an idea?









Thanks all.

craigr

[macgyver655]

I would think its in the video processing, vim, clm, maybe DPB. Dont have boards to swap to narrow it down?

[CIR Engineering]

[macgyver655]

I'm thinking that since both vert and horz are affected and its on all three colors then that eliminates a large number of boards. Those ones I mention were the most likely ones left.

But we all know to well that stranger things have been shown on boards not likely considered, LOL.

[tse]

Well, 930x2200 @ 72Hz can mean a couple of things. 930 pixels x 2200 lines (Eurpoean (Metric?)) would mean 158.5kHz horizontal rate. American style 2200 pixels x 930 lines is a more reasonable 66.96kHz which should work ok. The Marquee needs a minimum of 1us horizontal sync width to work right. What are the other sync and blanking parameters?

Scott

[cmjohnson]

I've occasionally seen that exact same thing occur on my own 9500LC at 1080P-60. It went away after I reseated all the chips on the daugher board of the HDM, as well as all other socketed chips on the HDM, cleaned the contacts between the daughter board and the
HDM, and reseated the HDM carefully. So I can only say that in my case, it was apparently a connection issue on the HDM.

The top of the picture vibrates rapidly from side to side. As you get farther down the picture, the amplitude of the vibration reduces.


Any idea what the firmware revisions are on the chips on the HDM? And on the CLM, for that matter? I wouldn't be surprised if it
turns out that later revisions work better at higher scan rates.


CJ

[CIR Engineering]

[CIR Engineering]

It is an "Active Area Scanning" resolution for 1080p without the black bars being sent to the projector.

http://archive2.avsforum.com/avs-vb/showthread.php?t=737385

craigr

[macgyver655]

I'm not Scott but I'm wondering is there any odd noises coming from the projector, like buzzing or such. I wanted to include HDM in my list but I just cant convince myself of it cause of the vert anomaly also there.

[CIR Engineering]

[CIR Engineering]

[CIR Engineering]

The client just emailed me that the problem only occurs after the projector has been running 90 minutes or more.

craigr

[Nashou66]

Hi Craig, I agree with CJ. Some times seating the main boards on the CLM is not enough. Each chip especially the U7 Chip on the Deflection Processor board.
Also like CJ said the HDM chips on the daughter board and the daughter board itself.

Scott is right about the 1us sync timing, I had an issue at .87us, waves on the vertical edges or lines.

I know you probably did this with the original set up but an initialization will clear out the memory and any corrupt memories. Might be that one is bad.

Mac, you could be right too about the HDM but it does have some wave forms coming from the VDM, it might go through that daughter board, I can't remember right now for sure.

Athanasios

[tse]

The h sync thing is important. Your format needs at least 150 pixels for the h sync width, that makes it 1us. If the video processor is unhappy about a parameter that it doesn't like strange things can happen. If the convergence isn't going wild the problem is probably in the h sweep. Deflection processor bd would be a likely culprit. Check the processor, though.

Scott

[macgyver655]

Yeah, that first image surely looks like it has vert movement. DPB is high on my list also.

[Nashou66]

[CIR Engineering]

[Nashou66]

There have been lots of different distortions from that board if it has issues, its a place to start at least right?

Tom

[CIR Engineering]

[CIR Engineering]