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piratepowwow
Joined: 27 May 2010
Posts: 51
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| Posted: Tue Jun 14, 2011 5:20 am Post subject: Color Balance Went Crazy All of a Sudden Green is Yellow |
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Reds are extremely dull, and greens and yellows are indistinguishable. Not sure how it happened, and no idea how to get it back looking decent.
I thought it might be the port 3 input i was using, but I switched to port 5 and it's the same story.
Anyone know where I should begin?
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6326
Location: Australia
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| Posted: Tue Jun 14, 2011 6:00 am Post subject: |
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You should begin by telling us what sort of projector it is.
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piratepowwow
Joined: 27 May 2010
Posts: 51
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| Posted: Tue Jun 14, 2011 6:08 am Post subject: |
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Touche' sir, I just panicked and made a post.
It's a Barco Graphics 1208.
I want to say the culprit is the red tube at this time. I can look directly into the red lense with no discomfort. Blue and Green are blinding. Just now did a G2 adjustment so that is in order but had no effect on the red tube.
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6326
Location: Australia
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| Posted: Tue Jun 14, 2011 6:13 am Post subject: |
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Are all the connections firm on the neck board?
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draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
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| Posted: Tue Jun 14, 2011 5:30 pm Post subject: |
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sounds like a dead tube or bad neck-board. You can swap neck-boards with Blue and see if the problem follows. Luckily used good Red tubes are common
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piratepowwow
Joined: 27 May 2010
Posts: 51
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| Posted: Tue Jun 14, 2011 7:42 pm Post subject: |
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To isolate whether the problem is the neckboard or the tube, I just swap the red and green signal leads that connect to the neckboards and see if the problem follows the lead, right?
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draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
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| Posted: Tue Jun 14, 2011 11:28 pm Post subject: |
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| piratepowwow wrote: | | To isolate whether the problem is the neckboard or the tube, I just swap the red and green signal leads that connect to the neckboards and see if the problem follows the lead, right? |
no typically to check a neckboard you would swap over the entire board from tube to tube. Swapping leads would simply check the Video board and that's highly unlikely for low emission.
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Tue Jun 14, 2011 11:59 pm Post subject: |
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Do both. I have had RGB input boards cause low gain (rare but possible), but do swap the whole CRT socket/video amp over. Let us know. I've got all the spare parts you need as well to get back up and running.
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piratepowwow
Joined: 27 May 2010
Posts: 51
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| Posted: Wed Jun 15, 2011 1:54 am Post subject: |
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I swapped the the leads and the problem didn't follow. I've left the projector unplugged since last night with the power button on so hopefully the thing will be discharged before I mess with swapping the neck boards.
Thanks alot yall!
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Wed Jun 15, 2011 2:00 am Post subject: |
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There's no high voltage on the neck boards. Go swap them!
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6326
Location: Australia
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| Posted: Wed Jun 15, 2011 6:58 am Post subject: |
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You dont need to pull out the HV leads!!
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RVonse
Joined: 09 Mar 2006
Posts: 3152
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| Posted: Wed Jun 15, 2011 10:45 am Post subject: |
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I had this very same problem a couple of years ago and changing the red tube is what finally fixed it.
But with my 12xx, my red is fading away again so I am wondering if there is anything a Barco chassis could cause a red tube to blow out. I know Marquee had a filament issue with their sets. Aren't the filament voltages all tied common in a Barco set? Other than too high of filament voltage, how else could a chassis ruin a red gun over time? Right now I have my red white balance slammed all the way max for the picture to look watchable. But with normal settings my symptoms would be very similar to the OP.
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piratepowwow
Joined: 27 May 2010
Posts: 51
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| Posted: Wed Jun 15, 2011 1:48 pm Post subject: |
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In that case I'm swapping those neck boards on my lunch break. I saw a capacitor almost the size of my fist under the hood of this thing...and I don't know what it's connected to. Not sure if this is normal or not, but I got a pretty hefty tingle while touching one of the neck boards with one hand and the case with another hand while I was connecting the jumper for G-2 adjustment.
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draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
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| Posted: Wed Jun 15, 2011 3:38 pm Post subject: |
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| piratepowwow wrote: | | but I got a pretty hefty tingle while touching one of the neck boards with one hand and the case with another hand while I was connecting the jumper for G-2 adjustment. |
was the machine turned off? 
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piratepowwow
Joined: 27 May 2010
Posts: 51
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| Posted: Wed Jun 15, 2011 6:39 pm Post subject: |
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I swapped the red and green neck boards with one another. No dice. Green is fine and red is still dim...and bleeds to the right.
Pulled the RGB switcher card and reseated it. No dice there either.
Tube not getting enough HV?
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draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
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| Posted: Wed Jun 15, 2011 10:24 pm Post subject: |
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| piratepowwow wrote: | | Tube not getting enough HV? |
tube filament burned out, you need a new tube.
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Thu Jun 16, 2011 1:42 am Post subject: |
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It does indeed sound like a bad tube. I've got them if you need one.
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Ile
Joined: 09 Mar 2006
Posts: 1491
Location: Jyväskylä, Finland
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| Posted: Thu Jun 16, 2011 6:55 am Post subject: |
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| RVonse wrote: | | Aren't the filament voltages all tied common in a Barco set? |
Yes they comes from same line and that line is usually stable.
| RVonse wrote: | | Other than too high of filament voltage, how else could a chassis ruin a red gun over time? |
It's probably just ageing, red doesn't wear so fast that others so it's leaved in when blue and green tubes are swapped. So in many projectors red tube have least twice as much hours that blue and green.
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draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
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| Posted: Thu Jun 16, 2011 3:55 pm Post subject: |
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[quote="Ile"] | RVonse wrote: | | So in many projectors red tube have least twice as much hours that blue and green. |
at least, 2 or 3 greens and blues before 1 red usually.
Good news for pirate is that makes them also cheap to buy
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piratepowwow
Joined: 27 May 2010
Posts: 51
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| Posted: Fri Jul 08, 2011 4:28 pm Post subject: |
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The projector has a run time of 7001 hours. Does that include standby time? I always leave it in standby.
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