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Old 07-18-2018, 02:56 PM   #1
sixstringartist
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Default CCFL wire insulator breaking down

https://imgur.com/a/yjEmFzT

The white spot here is where the wire insulation to the CCFLs has broken down. This monitor has a 2 second to black problem and I can see an arc for a second when powering up the monitor and the backlight is lit.

Is this a common failure pattern? Are there any component failures that are likely to be associated with a fault like this? Can I get by with wrapping the problematic area in electrical tape?
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Old 07-18-2018, 03:05 PM   #2
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Default Re: CCFL wire insulator breaking down

Not really, bad insulation, you can try.
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Old 07-18-2018, 04:41 PM   #3
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Default Re: CCFL wire insulator breaking down

i would spray it with insulator spray .. and separate the wires .
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Old 07-18-2018, 09:05 PM   #4
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Default Re: CCFL wire insulator breaking down

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Originally Posted by petehall347 View Post
i would spray it with insulator spray .. and separate the wires .
Like this stuff? https://www.amazon.com/3M-Electrical.../dp/B074T4D93R
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Old 07-18-2018, 09:29 PM   #5
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Default Re: CCFL wire insulator breaking down

A couple layers of electrical tape on both wires should work fine.
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Old 07-19-2018, 07:00 AM   #6
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Default Re: CCFL wire insulator breaking down

If you have a piece of 3M Hi-voltage splicing rubber tape that would work as well>
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Old 07-19-2018, 08:19 AM   #7
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Default Re: CCFL wire insulator breaking down

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Originally Posted by sixstringartist View Post
yes .i use a clear one .
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Old 07-19-2018, 08:43 AM   #8
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Default Re: CCFL wire insulator breaking down

can you remove that one wire out of the plug? (sometimes you can use a pin and press down on a lug and pull wire out of plug) then i would use some heat shrink tubing.
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Old 07-19-2018, 09:40 AM   #9
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Default Re: CCFL wire insulator breaking down

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Originally Posted by vinceroger69 View Post
can you remove that one wire out of the plug? (sometimes you can use a pin and press down on a lug and pull wire out of plug) then i would use some heat shrink tubing.
I probably could do that, Ive done similar work in the past and I have the heat shrink tubing. Is the tubing much of an insulator though? Ive always used it as a more professional looking ziptie.
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Old 07-19-2018, 09:43 AM   #10
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Default Re: CCFL wire insulator breaking down

Im not 100% sure but i would add two layers on each wire if possible and i think it would work fine i would certainly try it myself if i had this issue.
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Old 07-19-2018, 08:17 PM   #11
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Default Re: CCFL wire insulator breaking down

turns out at least 3 of the CCFL bulbs are toast. Fixing the cable is the least of my problems. Buying CCFLs online seems expensive. How to people normally replace these? Ditch the monitor? Pull from a donor? Thanks all for the responses.
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Old 08-03-2018, 07:15 AM   #12
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Default Re: CCFL wire insulator breaking down

How did you determine that 3 (or more) of the CCFLs are bad? I think that's very very unlikely. They may be getting old and starting to pull more current, but it's very unlikely all 3 will fail at once.

As for the wire insulation: I suggest using at least several layers of electrical tape and then heat-shrink tubing on top. Most electrical tapes, if I remember correctly, are rated around 300-600V per insulating sheet/layer. So several layers should provide plenty of insulation. The reason I like to put heat-shrink tubing on top is because I often find that electrical tape tends to unwind/undo itself or just get loose and move around. The heat-shrink tubing will keep it all in one place.

Last but not least, as far as replacing CCFLs: if you have a donor monitor of the same size, that should work fine. I've bought discount bulbs before from CCFL warehouse, and they weren't too expensive ($5 per bulb with $5 shipping total). But they didn't come with wires, so I had to re-use the ones from the old bulbs, which is a bit more work - especially when it comes to making sure things are well-insulated. Otherwise, the more expensive bulbs should come with all leads/wires.

That said, what's the brand and model of this monitor, and how important is it to you? If it's just a standard 17/19" monitor, it's probably not worth going through all the hassle of replacing the CCFLs, unless you're doing it just for learning purposes. For bigger and/or some specialty application, it may be worthwhile doing. But again, that all depends on how much you value your time and what you're trying to achieve.

Last edited by momaka; 08-03-2018 at 07:18 AM..
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