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Tim in Phoenix
Joined: 21 Oct 2006
Posts: 4409
Location: Phoenix
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| Posted: Mon Aug 27, 2012 11:12 pm Post subject: Noiseless HV arc, Marquee 9" Blue fixable? |
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Guys
Just installed three NOS Panasonic tubes in a 9500 Ultra; the high voltage crashes and comes back into focus every 3-4 seconds. Unplugging anodes one at a time isolated the problem to the blue tube. Could this be fixable by tapping on the gun? Problem was worse with higher contrast. I have only seen this twice in twelve years.
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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Tim in Phoenix
Joined: 21 Oct 2006
Posts: 4409
Location: Phoenix
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| Posted: Tue Aug 28, 2012 1:39 am Post subject: |
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| Nashou66 wrote: | Did you try a different neck board?
Nashou |
No, but a different tube works with the original neckboard.
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digitalayon
Joined: 02 Mar 2009
Posts: 921
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| Posted: Tue Aug 28, 2012 7:32 am Post subject: |
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What tubes are these?
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km987654
Joined: 25 Jul 2007
Posts: 2874
Location: Australia
TV/Projector: Barco BG809s
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| Posted: Tue Aug 28, 2012 7:36 am Post subject: |
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What about a different HT spot on the splitter. Switch splitter socket.
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dvh99
Joined: 25 Dec 2009
Posts: 2158
Location: nederland
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| Posted: Tue Aug 28, 2012 12:21 pm Post subject: |
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did you squeeze the aquadag connectors before reinstallment?
_________________
1 answer always poses multiple questions.
marquee 9500ultra HD10L moome hdmi1.3 v3+ some mods.
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Tim in Phoenix
Joined: 21 Oct 2006
Posts: 4409
Location: Phoenix
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| Posted: Tue Aug 28, 2012 12:51 pm Post subject: |
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Guys
These are LCP09s. All connections are tight. This projector is crated to ship out this morning so it will be a few days before I have another chassis on the bench to test with. I want to take the focus and flare yokes off for a better look.
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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 Aug 28, 2012 1:27 pm Post subject: |
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My guess is an intermittent H-K short or some similar contamination within the tube neck. Super rare, but possible. I would try a different neck board for S and G first though.
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Tim in Phoenix
Joined: 21 Oct 2006
Posts: 4409
Location: Phoenix
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| Posted: Sat Sep 01, 2012 7:38 pm Post subject: |
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This is really weird.....
I pulled out this tube again, I wanted a better look at the arcing problem, so I pull off the flare and focus yokes so I can look into the gun. I fire it up and........it doesn't arc now!. I am wondering if the yokes were damaged somehow and induced the arcing.
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