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lydmann
Joined: 12 Aug 2006
Posts: 56
Location: Norway
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| Posted: Sat Apr 15, 2017 6:54 pm Post subject: shortcut in tube, anything to do? |
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We manage to make a shortcut in the tube. So it is very bright and you can see retrace lines in picture. Any tricks to repair the damage?
I found this.. but I am unsure if it relevant .
https://www.repairfaq.org/REPAIR/F_monfaqa.html
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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: Sat Apr 15, 2017 8:02 pm Post subject: |
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What tube?
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cmjohnson
Joined: 03 Apr 2006
Posts: 5180
Location: Buried under G90s
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| Posted: Sat Apr 15, 2017 8:16 pm Post subject: |
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Some Sencore CRT analyzers/restorers have a "clear G2 short" function.
The presence of retrace lines indicates that you have a G2 short, probably to the cathode.
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lydmann
Joined: 12 Aug 2006
Posts: 56
Location: Norway
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| Posted: Sat Apr 15, 2017 8:57 pm Post subject: |
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p22-30 green 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: Sat Apr 15, 2017 9:50 pm Post subject: |
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H-K shorts in a front projection tube usually can't be cleared, so I think you need to replace it. I know I killed the filament in an NEC XG that I tried to do it to years ago.
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gjaky
Joined: 05 Jun 2010
Posts: 2802
Location: Budapest, Hungary
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| Posted: Sun Apr 16, 2017 1:05 pm Post subject: |
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If the tube is otherwise in good condition, for a H-K short I'd experiment with isolated DC-DC power supllies for the filament supply instead, that is less risky.
_________________
projectors in the past : NEC 6-9PG xtra, Electrohome Marquee 6-7500, NEC XG 1351 LC ( with super modified Electrohome VNB neckboard !!!)
current: VDC Marquee 9500LC
The MOD: VNB-DB, VIM-DB
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barclay66
Joined: 27 Jun 2011
Posts: 1304
Location: Germany
TV/Projector: Marquee 9500 Ultra
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| Posted: Sun Apr 16, 2017 5:24 pm Post subject: |
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Hi,
I managed repairing several tubes with shorts using my Müter crt analyzer/restorer (german brand). You could send it to me if you run out of options. It can't get worse after all...
Regards,
barclay66
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