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End banded CCFLs

End banded CCFLs

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Anyone else seen CCFLs end band? These were all starved and have since been recycled
They came out of a 37" LCD TV

IMG_20140820_193247_855.jpg

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Filename:IMG_20140820_193247_855.jpg
Album name:RCM442 / CCFL
Keywords:Lamps
File Size:63 KB
Date added:Sep 22, 2015
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Lumex120
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Multicolor NE-2s


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Sep 22, 2015 at 10:56 AM Author: Lumex120
I have a blue Logysis CCFL fan in my Powermac G5. The ends have started blackening like this after a few hundred hours. They will still work fine, however, since there is no emmiter to be lost.

Any machine is a smoke machine if you operate it wrong enough.

RCM442
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Sep 22, 2015 at 10:58 AM Author: RCM442
From what I have seen, these either go starved, like the ones above or the blackest end burns through.

Linear fluorescent will never lose to LED!
I am not Anti-LED, as I have some in use at my house.
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Florence


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Sep 22, 2015 at 09:21 PM Author: themaritimegirl
These all came from one TV? Interesting, I always thought CCFL-lit displays only had one or two tubes.

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RCM442
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Sep 22, 2015 at 09:27 PM Author: RCM442
Yep, for screens of this size, they need to use a bunch of them, otherwise the image would be uneven, I repair electronics and tinker with them as a hobby! A computer monitor usually has 1 or 2 of these, just a smaller diameter, I think these are T1

Linear fluorescent will never lose to LED!
I am not Anti-LED, as I have some in use at my house.
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Sep 23, 2015 at 09:08 AM Author: Ash
I replace CCFLs in LCD monitors. They definitely band up, get black "sleeves", and even melt the glass and crack near the electrodes at EOL

(powering one that is nearing EOL, or an EOL one while bypassing the cutoff in the ballast, will let you see why they melt and shatter - a spot on the cathode gets orange hot)
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Sep 23, 2015 at 09:13 AM Author: RCM442
Yep..I've had a couple that failed like that

Linear fluorescent will never lose to LED!
I am not Anti-LED, as I have some in use at my house.
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Sep 23, 2015 at 10:06 AM Author: TL buis
This is very common for CCFL lamps. Mercury starving is quite uncommon for these lamps. Did you wait long enough to heat up lamp??
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Sep 23, 2015 at 10:07 AM Author: RCM442
It was left on overnight..stayed a dim pink so yes, either that or they are contaminated

Linear fluorescent will never lose to LED!
I am not Anti-LED, as I have some in use at my house.
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120/240VAC @ 60HZ


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Sep 23, 2015 at 10:08 AM Author: LampLover
I tried to replace a CCFL in an LCD security monitor but I accidentally cracked the LCD while trying to separate it from the difuser panel. I got the lamps (There was two of them as it was only a 17" display) out but not in one piece That monitor must have had a whole lot of hours because (I would think it was on 24/7/365 until died as it was for the security systems cameras) as Ash described both ends were a black "sock"

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Sep 23, 2015 at 10:40 AM Author: Ash
Most 17 monitors i opened have 4 lamps. Only ones that are noticably dim (even when viewing an intact monitor) suffice with 2, this may be something specific to the security monitor if it was a specialised device....

My take at separating the LCD is, after i pull off the metal frame and get the LCD in the plastic frame, i stand it on the bottom edge or lay it LCD face down on a flat desk with some plastic wrap etc on it, and lowly separate them as slow as it goes.... In few monitors there is not actual attachmetn there, so i can just life the LCD off

I take out the board on the back, if the LCD is totally free, you can lift it by that board without much risk of tearing the flat cables (as you pull very evenly on all of them), but only if you really pull evenly and without much force, otherwise your attempt is doomed
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Zack


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Sep 22, 2018 at 07:33 AM Author: Fluorescent05

Yep, for screens of this size, they need to use a bunch of them, otherwise the image would be uneven, I repair electronics and tinker with them as a hobby! A computer monitor usually has 1 or 2 of these, just a smaller diameter, I think these are T1

I have a 17 inch edge lit Dell computer monitor (E173FP) and it has 4 CCFL lamps (2 on top and 2 on the bottom. I'm guessing those were T1 and the glass actually was able to be bent a little bit!

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