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9PG Xtra Constantly rescanning

post #1 of 16
Thread Starter 
I have a 9PG Xtra that seems to be working fine when running at higher resolutions. I can get it to run at 1080p and look really good, so I don't understand why I keep hearing that it cant do it...

Anyhow, my real problem. I just got a new cable box that does HDTV. When running on HDTV channels, it works perfectly. When I have low def channels, the box can either scale it and I lose a lot of the area of the screen. I have tried setting the box to change res to 480i/p when it gets a low def channel. It does that fine, but the projector constantly rescans, which takes about 5 seconds. It basicly flickers to a black screen, waits, then displays exactly what it did before. The OSD is also completely scrambled and looks horrible. Needless to say, it is very annoying. Does anyone have any idea why this may be happening?

Also, sometimes the projector 'forgets' it has matching resolutions at high def, and declares it is an 'Unregistered signal'. It is kind of annoying having to change the aplitude so I get the proper aspect without simply changing the 'input list'. I think the two problems could be related.
post #2 of 16
You've either got some issues with the oscillator parts of the Deflection board...


Or....the dreaded scrambled mess, which is a system board on the way out..

Search on dreaded scrambled mess (don't forget the archives).
post #3 of 16
Thread Starter 
Are these just defects that can happen randomly? Or do they only come after a lot of usage? After watching it with it flickering a few dozen times, it stops flickering and just works... Even the OSD seems to start working fine...

What is considered high-hours on these? According to the hour meter, it says it is at 1800 hours, which seems rather high to me... How long will one of these last? The picture seems great to me, but I've never seen one setup properly to gauge my inexperienced setup against...
post #4 of 16
IdleGod,
Usually the system board problem 'Dreaded scrambled mess' will come from power related 'brown outs' or high earth ground to neutral voltages above 1VAC. Check your receptical between the center prong and the wide spade. You can disconnect the RGBHV cable and see what happens with no signal, if the menus are scrambled then a good chance its the system board.

1800 hrs is on the low side depending what contrast your running. If you have bad line power it wont really matter how many hours.

This can also be weak caps on the deflection board but depends on the no signal check out. Doug
post #5 of 16
Thread Starter 
Its taken me some time, but I finally tried unplugging the BNC's. While its flickering, it is OK.

It has also started happening on some other, high def content, but not all. To me, it is starting to smell like the Component -> RGB device I have... My computer, which is directly connected to my extron, has no issues. Only component devices are having trouble....


Edit:

It also seems to be quite hot.. My father has placed as many of our massive heat producing equipment all on the same rack... and crammed as much in as possible.. As this is a work in progress, to me it is stupid. Especially since I need access to the back of the rack quite often...

Could heat on the devices also cause this?

BTW, the Component -> RGB I have is from Crescendo. Normally all works pretty well, I just hope the heat hasn't damaged it....
LL
post #6 of 16
Those numbers are wrong.

15.1khz video signal, but a 33.9 hz? That's wrong. Not sure if it's the oscillator circuits on the deflection board, or the transcoder is screwing things up. That should be 30.0 hz.

What happens if you connect a PC at, say 640x480 at 60hz? Does it report the numbers correctly (matching powerstrip would be a good test)?
post #7 of 16
Its also saying sync on green. That is coming out of the Crescendo? Doug
post #8 of 16
Thread Starter 
That picture is with the BNC's disconnected at the Extron end. So its conencted to nothing but empty ended cables.

It seems to report the rates correctly, including the syncs. I don't usually go as low as 640x480/30Hz as its difficult to change that on X without reloading the server. I will confirm the numbers it is getting at 1080i from my PC tonight when I get home.
post #9 of 16
Thread Starter 
fh = 33.8KHz
fv = 60.8Hz

1080i. Those numbers are about right, unless I really suck at math.
post #10 of 16
That sounds right.
post #11 of 16
Thread Starter 
Ok, I have done a few more tests to see what exactly is happening... Interlaced seems OK, except at 480i. When its that low, it seems the res is kinda wrapped, which I think is causing that.

When in progressive mode, it chops it to hell. 1080p, 720p... Just the OSD. I am trying to run it at 480i right now, and no rescanning yet. (I hadn't really given it much of a chance at 480i).

This is all so confusing...

The 9PG Xtra is able to do progressive, no? Is there a setting I am missing?
post #12 of 16
I am not sure if this is a problem with pg's as well as xg's but are all of the input selections on the same page in your input select option? This is a NEC problem and you need to move all of your input selections onto the same page or screen then the PJ will find it and sync. to it when it switches from signal to signal.
post #13 of 16
Umm, ahh, I've never heard that one before, and I have had both PGs and an XG.
post #14 of 16
Thread Starter 
Theyre all on the first page... :S That specific problem isn't really a bother to me, since I can just set the 'default' convergence and it catches it pretty well. The real issue is the OSD blowing up when in progressive scan mode, and it rescanning when in low def.

It is strange, since the regular video is fine, but the OSD is all wonky. Obviously I want to tweak some things when in progressive mode (1080p), since its kinda chopped pretty bad, but since I cant see the test pattern or the OSD correctly, it makes it almost impossible...
post #15 of 16
Doug or I can test the boards for you. At this point it seems you either need a second set of boards to swap or send your boards to someone with a spare set.
post #16 of 16
Thread Starter 
Which boards specificly? The ad-ins? Or the main boards as well? IIRC there is a card or two inside of it.

The only problem is then I won't have a TV for a few weeks, as this is my primary TV. (hence how I've more then doubled the hours in 6 months).

What would the 'worst case' be for replacing boards? Specificly cost wise. If the most expensive board in the unit was dead, how much would that run me basicly.

We recently moved a lot of the AV equipment to a different place, where the same power line that drives the projector is connected to some older, shadey looking power bars. I wonder if I get a UPS it would clean up the power, and perhaps solve this. Would it be worth giving that a try?
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