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cosaw
Joined: 08 Mar 2006 Posts: 159 Location: Nottingham, England
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Link Posted: Tue Dec 30, 2014 1:24 pm Post subject: Barco Data 500 Blue tube streaking after bang and flash! |
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Here's what happened. I took the red tube out to defungus. I didn't get the correct syringe in the post for the job so I put the red tube back in while I wait for the new year post. I think it's unrelated but a few hours after having the pj back on I get a blue flash with a crack from inside the pj. I imediately think it's HV. The image collapses momentarily but then comes back up and I quickly notice horizontal streaking in the image.
So far I have identified the streaking is on the blue tube. I've swapped the RGB amp boards and ruled that out. Now I'm thinking neck boards or focus board. I've got both spare somewhere but need to do some rooting cos everything is still all over the place since a house move.
What do you guys think? Any help much appreciated.
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Curt Palme CRT Tech
Joined: 08 Mar 2006 Posts: 24301 Location: Langley, BC
TV/Projector: All of them!
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Link Posted: Tue Dec 30, 2014 2:48 pm Post subject: |
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Does the crosshatch pattern also streak? I also would have said video amp. I can't see it being the CRT socket. It could also be the blue tube if it has an internal short.
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cosaw
Joined: 08 Mar 2006 Posts: 159 Location: Nottingham, England
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Link Posted: Tue Dec 30, 2014 3:04 pm Post subject: |
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Thanks for your input Curt. Crosshatch seems fine but will check again tonight. It's most obvious in dark scenes in video - turn the brightness up so you can see the rasters on screen and it's plain to see.
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cosaw
Joined: 08 Mar 2006 Posts: 159 Location: Nottingham, England
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Link Posted: Tue Dec 30, 2014 7:31 pm Post subject: |
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Quick update. Can't see any streaking on a genlocked pattern. I think because it's static and the streaks seem perfectly horizontal.
Didn't see before but the red LED on the horizontal board is very dimly lit. However I seem to remember it's always been like that and I guessed that when it came on proper it would be brighter. Anyway I'll first try to find my spare horizontal board to rule that out then I'll go from there.
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Curt Palme CRT Tech
Joined: 08 Mar 2006 Posts: 24301 Location: Langley, BC
TV/Projector: All of them!
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Link Posted: Wed Dec 31, 2014 1:38 am Post subject: |
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It won't be the H board. video issue only.
that dim red light is normal for some 500/800 sets.
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cosaw
Joined: 08 Mar 2006 Posts: 159 Location: Nottingham, England
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Link Posted: Wed Dec 31, 2014 1:16 pm Post subject: |
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Thanks Curt. You've saved me from rooting round unnecessarily for the H board.
You're saying it's a video issue - or have I misunderstood? I'm feeding with 5 bncs so I can swap round the RG and B but I can't see it's that because of the flash and crack within the machine.
Don't know how to proceed. Maybe I'll swap the blue and red tubes round and see if it follows the tube - rule out the tube short.
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CasetheCorvetteman
Joined: 09 Nov 2008 Posts: 6319 Location: Australia
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Link Posted: Wed Dec 31, 2014 2:32 pm Post subject: |
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Try swapping the locations on the splitter for red and blue.
_________________ Barco CineMAX, 120" OZ Theatre Majestic 16:9 screen, H/K AVR 7.1...
RUNCO DTV991 LC ( NEC XG 852 LC ) 100" 4:3 screen, H/K AVR 5.1...
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Curt Palme CRT Tech
Joined: 08 Mar 2006 Posts: 24301 Location: Langley, BC
TV/Projector: All of them!
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Link Posted: Wed Dec 31, 2014 2:39 pm Post subject: |
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Cosaw, do swap the RGB inputs and the quad decoder and RGB switching board before swapping tubes.
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cosaw
Joined: 08 Mar 2006 Posts: 159 Location: Nottingham, England
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Link Posted: Wed Dec 31, 2014 2:55 pm Post subject: |
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Thanks Case. Have tried that but no harm trying again.
Thanks Curt - I hear you. Unfortunately I think the only spare board I'm missing is one of the quad decoder or the RGB switching board - will only know that when I find the spares!
_________________ Simon
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CasetheCorvetteman
Joined: 09 Nov 2008 Posts: 6319 Location: Australia
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Link Posted: Wed Dec 31, 2014 4:11 pm Post subject: |
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I dont think itll show you anything but its so easy to try
_________________ Barco CineMAX, 120" OZ Theatre Majestic 16:9 screen, H/K AVR 7.1...
RUNCO DTV991 LC ( NEC XG 852 LC ) 100" 4:3 screen, H/K AVR 5.1...
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cosaw
Joined: 08 Mar 2006 Posts: 159 Location: Nottingham, England
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Link Posted: Wed Dec 31, 2014 4:43 pm Post subject: |
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Yes you're right there case - I reasoned the same.
_________________ Simon
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cosaw
Joined: 08 Mar 2006 Posts: 159 Location: Nottingham, England
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Link Posted: Wed Jan 07, 2015 8:04 pm Post subject: |
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Ok. Here's where I'm up to. I switched the RGB bnc cables on the rear to see if the streaking moved tube. It did move tube but I really didn't understand why. How could a streaking issue on the blue tube, from the source (HTPC), cause a blue flash and crack twice in my Barco?
Well in actual fact it just seems to be a really unusual coincidence. I tried the dvd in my laptop and noticed that the streaking was still there in the image so that for definite points to the streaking coming from the source. I tried other dvds in my HTPC and none of those streaked over the pj. So that's that covered. The dvd in question was The Dark Knight, 01:03:50 to 01:04:50 gives a good example of the streaking on the dvd - and yes it does only affect blue!! That's PAL though so an NTSC version will be at a different time - look around there though and if the NTSC disc has the same problem you won't be far away from spotting it, look in dark scenes and make your raster visible to see it easily. it seems to affect most of the disc actually as I skip through chapters - less so in the beginning chapters maybe. Did a search on the internet and can't seem to find any evidence of anyone picking up on this before - maybe most people have got the Blu-ray.
So it seems that I got an arc around about that time (as stated above) while watching the film. A coincidence! I think because I thought the machine was going to shut down I examined the image closer, with hyper-vigilance, and noticed the almost bizarrely coincident streaking coming from the dvd.
What am I to make of this? I must assume, for now, that when I put the red tube back I overstressed the HV wire and cracked it somewhere and now I've got an arc. Either that or part of the HV circuit is failing regardless of me playing with the red tube. I'm feeling no that it's either a cracked HV cable on red or a failing splitter.
All I can do is keep an eye on the set and hope not to have anymore freaky and confusing coincidences. Keep an eye on it and wait for it to arc over again. Incidentally my 10 cm syringe needle has arrived so I may get on with cleaning the red tube out anyway.
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Curt Palme CRT Tech
Joined: 08 Mar 2006 Posts: 24301 Location: Langley, BC
TV/Projector: All of them!
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Link Posted: Wed Jan 07, 2015 8:16 pm Post subject: |
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it is a coincidence. My guess is that the shield on the blue cable has lifted.
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cosaw
Joined: 08 Mar 2006 Posts: 159 Location: Nottingham, England
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Link Posted: Thu Jan 08, 2015 8:49 am Post subject: |
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Quote: | it is a coincidence. My guess is that the shield on the blue cable has lifted. |
Wait a minute Curt - I don't follow. Sorry I couldn't make my last post briefer/clearer but it seems that you missed my point slightly.
Streaking was definitely tracked to one DVD - and yes just the blue component!! It was evident on another laptop through a different cable to a computer monitor. I just didn't check sooner cos I though it must have to be the pj.
That would rule out the shielding on the BNC cable to the pj and other dvds look fine. Or are you talking about the red HV cable?
Thanks in advance.
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macgyver655
Joined: 22 Aug 2007 Posts: 8508
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Link Posted: Thu Jan 08, 2015 2:40 pm Post subject: |
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It is possible that the natural oil on your hands that was transferred to the tube was enough to cause the arc. Might not hurt to wipe down tube with alcohol during install.
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Curt Palme CRT Tech
Joined: 08 Mar 2006 Posts: 24301 Location: Langley, BC
TV/Projector: All of them!
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Link Posted: Thu Jan 08, 2015 2:52 pm Post subject: |
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AS usual I speed read. Very strange on the DVD. I missed the line where no others DVDs did it. Tubes do arc every once in a while, it's in their nature.
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cosaw
Joined: 08 Mar 2006 Posts: 159 Location: Nottingham, England
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Link Posted: Thu Jan 08, 2015 3:36 pm Post subject: |
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Many thanks mac - if I may call you that. I will take note. Do I need to worry about the actual bell of the tube? Isn't it covered with some X-Ray shielding or something? Don't know how alcohol will interact with that.
Thanks Curt I'll keep an eye on the situation - I gathered you'd read quickly. As long as it doesn't arc while I've got my hand in there doing the astigmatism! Yes the DVD - The Dark Knight PAL, you guys in the states won't be able to check that out - now I look through it I find it's littered with the problem while at a quick look, Batman Begins and The Dark Knight Rises are not!
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macgyver655
Joined: 22 Aug 2007 Posts: 8508
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Link Posted: Thu Jan 08, 2015 5:00 pm Post subject: |
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cosaw wrote: | Many thanks mac - if I may call you that. I will take note. Do I need to worry about the actual bell of the tube? Isn't it covered with some X-Ray shielding or something? Don't know how alcohol will interact with that.
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Mac is fine. You don't want to drench it with alcohol, just dampen a cloth with it and just a light wipe is all just to remove any residue. And don't worry about areas you did not touch.
I think I remember some devices having problems playing the dark night and some other titles. Some requiring a firmware update and others just unable.
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cosaw
Joined: 08 Mar 2006 Posts: 159 Location: Nottingham, England
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Link Posted: Thu Jan 08, 2015 5:12 pm Post subject: |
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Thanks for the further details Mac.
Regarding the Dark Knight - it's like the sort of compression artifact that loads of dvds manage to get away with on say an old 32" 16:9 crt but will stick out readily on the big screen. Suppose I need to get with the times and move past DVD!
_________________ Simon
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