| Author |
Message |
secstate
Joined: 20 Mar 2006
Posts: 720
|
| Posted: Sun Feb 08, 2009 2:37 pm Post subject: Barco Data 808s Spot Kill? Problem |
|
|
Well my old reliable Barco Data 808s had decided to start acting up and this is an odd one. On shutdown, the green tube and green tube only shows a "lighting strike" and then collapse of the beam to a dot. It is somewhat dim (so no tube burn yet) but it does show up on screen. Not good. This problem only shows up on green, red and blue are fine.
I have had a Barco 180DVB with the "firework" light show that sometimes develops in the the tubes at and this is not that as that effect is much more diffuse than this. My projector has about 5800 hours on the clock, of which 700 are from my ownership. Tubes are newer and were installedl by me and have about 900 hours on them (they were installed in another projector first).
Things I have tried so far. I have swapped RGB amplifer with spare I have and problem was still there. I also swapped out the G2/Diagnostics board and that did not help either. I have a spare non-S chasis here but unfortunately it seems most boards in the back are different numbers so not much more to swap.
Any ideas?
|
|
| Back to top |
|
 |
Tom.W
Joined: 09 Mar 2006
Posts: 6635
|
|
| Back to top |
|
|
secstate
Joined: 20 Mar 2006
Posts: 720
|
| Posted: Sun Feb 08, 2009 7:56 pm Post subject: |
|
|
Tom, that some interesting reading. I have come the conclusion based on more experimentation that it is the tube in some shape, form or fashion. The tube exhibits no other issues other than the fireworks at shutoff. The raster on green is no darker or lighter that I can tell when compared with either two tubes. When I first had these tubes (new GL surplus) the blue had an internal short that caused noticeable variation in the brightness of the projected image. Some careful but firm whacking on the neck of the tube dislodged whatever was causing the short and it went away.
My previous Barco 808 Data had another set of tubes in it where the red experienced something similar the difference being that on that tube it was more of a circular explosion rather than a vertical line that turns into a diffuse dot and disappears. Unless I come up with something else to pursue I guess I will live with it as the "fireworks" show is considerably dimmer than the projected image and it is fairly difuse and therefore does not appear to represent a danger to the tube. It just bums me out that such low hour tube would have this problem.
|
|
| Back to top |
|
|
Tom.W
Joined: 09 Mar 2006
Posts: 6635
|
| Posted: Sun Feb 08, 2009 10:10 pm Post subject: |
|
|
I also have a BD 808 but I had the same problem of fireworks on shutdown on the Blue CRT. Also it never really turned fully off. The Sencore 7000 cleared the short and no more problems with the Blue CRT... 
|
|
| Back to top |
|
|
secstate
Joined: 20 Mar 2006
Posts: 720
|
| Posted: Sun Feb 08, 2009 10:58 pm Post subject: |
|
|
|
I might have to look at getting a Sencore if it starts to impact the operation of the tube rather than just the shutoff. I will have to look closely again tonight but other than the normal AKB glow on all three tubes, I didn't notice anything other than a very dim raster that was more or/less the same on all three tubes. On the other hand maybe this is a good excuse to get one of the Runco 1100s I got last weekend up on the ceiling instead .
|
|
| Back to top |
|
|
macgyver655
Joined: 22 Aug 2007
Posts: 8508
|
| Posted: Mon Feb 09, 2009 12:07 am Post subject: |
|
|
|
The only way to verify if its the tube or not is to swap neckboards between the green and another color, wires and all if they are long enough, or if the wires are not long enough, swap the green tube with the red or blue tube. Or if you have another known good tube of any color.
|
|
| Back to top |
|
|
Ile
Joined: 09 Mar 2006
Posts: 1491
Location: Jyväskylä, Finland
|
| Posted: Mon Feb 09, 2009 8:24 am Post subject: |
|
|
|
Try crt run in cycles (service menu) few hour and see if it helps.
|
|
| Back to top |
|
|
perisoft
Joined: 29 Aug 2007
Posts: 2920
Location: Ithaca, NY
|
| Posted: Mon Feb 09, 2009 3:21 pm Post subject: |
|
|
Just keep it running.
_________________
|
|
| Back to top |
|
|
secstate
Joined: 20 Mar 2006
Posts: 720
|
| Posted: Tue Feb 10, 2009 12:31 am Post subject: |
|
|
| Ile wrote: | | Try crt run in cycles (service menu) few hour and see if it helps. |
Thanks for the suggestion a friend of mine suggested the same thing and I have been running it for about 5 hours now. Still get the spot on shutdown but it might, just might, be less. If that doesn't work I will remove the tube and carefully bang on the neck as that was the only thing that fixed my blue when it had the same problem.
|
|
| Back to top |
|
|
jkruger
Joined: 24 Oct 2007
Posts: 2435
Location: Carlsbad, CA
|
| Posted: Tue Feb 10, 2009 3:11 am Post subject: |
|
|
|
I had a similar issue on blue, I tapped on the neck while it was still in the PJ and it cured it.
|
|
| Back to top |
|
|
secstate
Joined: 20 Mar 2006
Posts: 720
|
| Posted: Wed Feb 11, 2009 2:42 pm Post subject: |
|
|
|
Just to update folks for the record. Over 17 hours of the CRT run in cycle and the shutdown light show is still there. Light tapping on the tube in the projector has not helped either. I am going to remove the tube this weekend (or at least attempt to do it while the projector is celing mounted) and try a bit more aggresive tapping of the tube while I can support the neck more securely. That is what finally cured my blue tube issue when it was new.
|
|
| Back to top |
|
|
jkruger
Joined: 24 Oct 2007
Posts: 2435
Location: Carlsbad, CA
|
| Posted: Wed Feb 11, 2009 3:00 pm Post subject: |
|
|
| secstate wrote: | | Light tapping on the tube in the projector has not helped either. |
Bigger hammer! or a Sencore.... 
|
|
| Back to top |
|
|
macgyver655
Joined: 22 Aug 2007
Posts: 8508
|
| Posted: Wed Feb 11, 2009 4:00 pm Post subject: |
|
|
|
I'm not going to say that it is definitely not the tube, but WHY are you hammering on it without verifying it IS the tube first?
|
|
| Back to top |
|
|
jkruger
Joined: 24 Oct 2007
Posts: 2435
Location: Carlsbad, CA
|
| Posted: Wed Feb 11, 2009 4:04 pm Post subject: Re: Barco Data 808s Spot Kill? Problem |
|
|
| secstate wrote: | Well my old reliable Barco Data 808s had decided to start acting up and this is an odd one. On shutdown, the green tube and green tube only shows a "lighting strike" and then collapse of the beam to a dot. It is somewhat dim (so no tube burn yet) but it does show up on screen. Not good. This problem only shows up on green, red and blue are fine.
I have had a Barco 180DVB with the "firework" light show that sometimes develops in the the tubes at and this is not that as that effect is much more diffuse than this. My projector has about 5800 hours on the clock, of which 700 are from my ownership. Tubes are newer and were installedl by me and have about 900 hours on them (they were installed in another projector first).
Things I have tried so far. I have swapped RGB amplifer with spare I have and problem was still there. I also swapped out the G2/Diagnostics board and that did not help either. I have a spare non-S chasis here but unfortunately it seems most boards in the back are different numbers so not much more to swap.
Any ideas? |
I thought he had swapped neckboards already....
|
|
| Back to top |
|
|
secstate
Joined: 20 Mar 2006
Posts: 720
|
| Posted: Wed Feb 11, 2009 4:43 pm Post subject: |
|
|
|
Yeah I swapped the RGB driver and the simple neckboard on the back of the tube (they are two seperate parts on this Barco) and that made zero change to the tube. Unfortunately the cabling in the Barco is too short to run the red or blue feed to the green tube. That said I have swapped several other boards where they were the same as what was in the non-S Barco 808 spare chassis I have and that made no difference. Unfortunately I sold all my spare 8" tubes several months ago because I figured at the 200-300 hours I put on the projector a year that my existing tubes which have less than 700 hours on them now would last me until I went digital. So I would rather remove one tube to carefully whack it, rather than remove and replace two, to test the green tube on the red or blue channel.
|
|
| Back to top |
|
|
macgyver655
Joined: 22 Aug 2007
Posts: 8508
|
| Posted: Wed Feb 11, 2009 6:38 pm Post subject: |
|
|
Did you try the decoder driver module or the output boards for each color? Output being different from socket board. The IBCL line is sent to each individual output board from the driver module.
This is why I suggested what I did. There is more then just 1 or 2 boards involved in this. Swapping the entire chain would verify whether its the tube or not.
But if you must hammer away then oh well.
|
|
| Back to top |
|
|
macgyver655
Joined: 22 Aug 2007
Posts: 8508
|
| Posted: Wed Feb 11, 2009 6:47 pm Post subject: |
|
|
| secstate wrote: | | So I would rather remove one tube to carefully whack it, rather than remove and replace two, to test the green tube on the red or blue channel. |
So lets see. Rather then take the time to swap tubes to verify its definitely the tube, you would rather whack on it for the heck of it and see what happens. Then if you break, it your done.
|
|
| Back to top |
|
|
Tom.W
Joined: 09 Mar 2006
Posts: 6635
|
|
| Back to top |
|
|
km987654
Joined: 25 Jul 2007
Posts: 2874
Location: Australia
TV/Projector: Barco BG809s
|
| Posted: Thu Feb 12, 2009 8:50 am Post subject: |
|
|
|
Have you changed the RGB switcher board??
|
|
| Back to top |
|
|
secstate
Joined: 20 Mar 2006
Posts: 720
|
| Posted: Thu Feb 12, 2009 6:42 pm Post subject: |
|
|
Tom, thanks I missed that I will try that once I pull the tube out this weekend.
|
|
| Back to top |
|
|
|
|
