CurtPalme.com Home Theater Forum

[Rittberg]

Hi,
In the last days I am facing a problem with the 1209s,
Suddenly the picture becomes very dim (similar to a situation that the contrast and brightness set to zero) on the screen you see nothing. Only when looking into the tubes you can see the picture. After a while (few seconds – few minutes) the picture is back and good again
The Barco's menu behave the same, pressing the menu when the picture is good -> the Barco's menu is bright/OK , when the picture become dim, Barco's menu is dim too.
I have many boards (hopping that they are good) so I replaced:
The SMPS board.
The G2 board.
The RGB Gain control board
The Quad decoder board
The HORIZONTAL DEFLECTION board
The MAGNETIC FOCUS & HOR. SHIFT board
The QUADRUPLER
But NO-GO
In the video chain I am using EXTRON ( a monitor is connected), The picture in the monitor is always at the same level even when the picture become dim on the Barco. I replaced the Extron with another one but still NO-GO.

All leds in the G2 board are green even in the dim situation.

Thanks for any Idea.

[CasetheCorvetteman]

What about the splitter?

[Rittberg]

Thanks,
Changed the splitter this morning, I run the Barco for 2 hours The problem shows again one time for few secondes,
I will test it again for longer time this evening.
Thanks.

[CasetheCorvetteman]

Sounds like a bad connection there somewhere to me, but i dont know enough about Barco projectors to know where you should look.

[Curt Palme]

THis is a strange problem. It could also be a neck board/video amp on the back of the CRTs, that's where the AKB/auto brightness circuit takes its feed from. A long time ago I had a dim 1209s and it turned out that one neck board was bad, causing all 3 tubes to go dim.

[Curt Palme]

THis is a strange problem. It could also be a neck board/video amp on the back of the CRTs, that's where the AKB/auto brightness circuit takes its feed from. A long time ago I had a dim 1209s and it turned out that one neck board was bad, causing all 3 tubes to go dim.

[Rittberg]

Update.
The problem shows but less, yesterday for 3 hours was OK but this morning one time (by switching the Extron to off and on again the Barco is back from the dim mode).
After replacing the splitter I find that I have to recalibrate the convergence, geometry and the electronic focus – is it normal?
Re. the electronic focus, at the left side of the screen I have to push it to 99% and it seems that I need another 10-15%, is there another way to adjust the electronic focus at the left side?
Thanks.

[CasetheCorvetteman]

That splitter may be no good. I cant comment further than that, but i do have a spare splitter here that came with my CineMAX that has "blury, no focus" written on the side of it.

So not having tried it, id say it is still possible the splitter is causing at least that focus issue, but ill let Curt confirm that.

[Curt Palme]

The splitter is a bit out of tolerance, but we're not concerned about that right now. Is it still going dim with the new splitter?

[Curt Palme]

The splitter is a bit out of tolerance, but we're not concerned about that right now. Is it still going dim with the new splitter?

[Rittberg]

It seems that replacing the splitter didn't solve the problem.
right now I am watching the Barco and it become dim every 10-20 minutes. after 15 -30 seconds the picture is back to the right level without touching any thing from my side.

[Curt Palme]

All I can suggest is to swap whatever boards you haven't swapped yet. Without getting in there with a scope or meter, this is going to be near impossible to repair via email. If you've swapped all the boards, my guess would be a bad connection on the motherboard. I've never had that happen before, but then again I've also not had your Barco's problem before either.

[Curt Palme]

All I can suggest is to swap whatever boards you haven't swapped yet. Without getting in there with a scope or meter, this is going to be near impossible to repair via email. If you've swapped all the boards, my guess would be a bad connection on the motherboard. I've never had that happen before, but then again I've also not had your Barco's problem before either.

[Rittberg]

Thanks,
I didn't replace yet the EHT and the neck board (I have only one....).
Where is located the motherboard or what is the part number of that board ?

[Curt Palme]

The motherboard is what all the smaller boards plug into. I believe it is riveted in place, there's no way to change it except for swapping the whole chassis. I actually would have a whole chassis for you if you want it, but shipping would be expensive. Try the neck boards first. I have spares if you need one.

[Curt Palme]

The motherboard is what all the smaller boards plug into. I believe it is riveted in place, there's no way to change it except for swapping the whole chassis. I actually would have a whole chassis for you if you want it, but shipping would be expensive. Try the neck boards first. I have spares if you need one.

[CasetheCorvetteman]

Mother board got no actual components on it though does it?

[Rittberg]

Thanks,
The SYNC & VERTICAL DEFLECTION board was not replaced yet (It is not in my inventory), may this board cause the dim issue? Should I look after that board?

Thanks.

[Curt Palme]

[Curt Palme]

[Rittberg]

Update,
After the recommendation to check the neck boards and if this doesn't help to swap the whole chassis, I buy another 1209s for spare parts.
I checked again with the new boards that I didn't have in my inventory before the new 1209s arrived , started with the RGB input+ Switching boards - R762719
It seems that that board caused the dim problem, since last Saturday the PJ is running OK.

Thanks for your inputs.