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Question about CCTUBEGN 12.5''TUBE Fluorescent Lamp Kit

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When to replace

How do I know when a florescent lite needs replacing?

Posted by Anonymous on

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Inside a fluorescent light, electricity is delivered to a ballast, which sends a spark through the mercury-vapor-filled tube (or bulb), creating light by activating phosphors that coat the inside of the tube. If any of the components are faulty, the light won't work right. Once you pinpoint the problem, most fixes are very easy. Remember to turn off the power first! Old bulbs blink off and on just before they die; repairs are often simply a matter of replacing the tube or bulb. This problem may also be occurring because of poor contact between the pins at the ends of a tube and the tube holders. If the pins are bent, use needle-nose pliers to straighten them. Clean up the pins and socket contacts with fine sandpaper, and brush away residue. Though gray bands at the ends of tube are normal, black bands indicate that the tube needs to be replaced. If only one end is dark, turn the bulb end-for-end. If the tube is new and these fixes don't work, you may have to replace the starter or ballast. Some fixtures ("A-rated") are quieter than others are, but most fluorescent lights have a slight hum. If the sound seems too loud-- or if you can smell electrical burning-- shut off the power. The ballast is probably either the wrong type, improperly installed, or defective. Replace it or call an electrician. Brand new tubes tend to flicker, as do bulbs that are cold. If an old tube still flickers after it has had a chance to warm up (or after you've warmed up the room), rotate it a couple of times in the tube holders. Try cleaning the tube's end pins. If it still doesn't work, replace it. If only the ends of the tube glow, either the starter or the ballast is defective. Replace the starter, then the ballast.

Posted on Jan 18, 2006

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How to restore your LCD TV's blank picture

Is your LCD TV powering on and playing sound, but displaying only a black screen even though your screen isn't cracked? If so, you may be in need of backlight repair.
There is a florescent tube backlight in most LCD TVs located right behind the screen itself. Its purpose is to light up the images displayed by the screen; without the backlight, these images are virtually invisible.
It is not always the florescent tube (or tubes) themselves that need to be replaced, but sometimes their inverter. An inverter is a special circuit that powers florescent lights by feeding them AC (alternating current) at a high frequency.
If either of these are damaged, it will cause the symptoms described above. But how do you know if you need to replace them?
Upon opening up your TV, the problems may be apparent-- and they may not. The tubes may be cracked, but even if they show no obvious damage, they could still be malfunctioning. The same goes for the inverter, usually there will be no signs even if they are damaged. Although sometimes there may be visible scorch marks on the inverter board. The point is that you may have to conduct a little trial and error to find out which is your problem.
But where to find replacements? A good source is ebay or any site individuals sell their items. You see, when people break their LCD screens, they want to try and recoup their losses a little. This means stripping down their TV and selling the parts. Just search your TV's make and model along with the words "inverter" or "backlight." You may also try the words "as is" or "for repair" to find entire broken TVs for sale that you can strip down yourself.
If you choose to dismantle your TV in any way please be sure to unplug it first, and just be careful in general; if you don't know what your doing, you coule make matters worse. Also remember that there are no guarantees. This solution has worked for me multiple times in the past, but your situation could be very different.

Well that's about it, I hope this helps people. I just joined this site today, and I've already given this exact advice to like six people so I figured it was a good subject to write my first tip thing about.
Good luck.
-- Kyle Brownell
on Mar 20, 2010 • Televison & Video

I have an overhead panel of eight 4' flourescent lights which I believe are each 40 watts. The dimmer switch that controls them all as a unit has failed. Any suggestions about where to get a replacement...

Google-search: florescent slide dimmer
You have 320 Watts, 120 volts, and the circuit uses 2.6 amps.
Volts x Amps = Watts.

1) The florescent slide dimmers seem to cost $100-120

2) If you search for florescent dimmer, the cost is lower than the slide dimmer.
Leviton sells for $50

The dimmer switch will turn on and off but wont dim the lights on a chandelier. model 6681-w. tried 2 different ones with the same results.

The Leviton 6681 is a push-button rotary-type incandescent dimmer with 600Watt capacity
If you have incandescent bulbs, the dimmer should work.
If the dimmer has different color wires, try reversing the wires.
If the dimmer replaced a 3-way switch, then this is not the right dimmer.
If you have compact florescent bulbs, you need a dimmer that also dims florescent.
Link shows the Leviton 6673 incandescent and florescent dimmer

But you also need dimmable compact florescent bulbs.


As a general rule, grounding will not affect operation of dimmer.
Type of dimmer, type of switch being replaced, type of load, and how you connect wires will affect dimmer.

Here is Lutron dimmer switch page

What is the load? Are you wiring dimmer to a ballast? Or fan? Or incandescent lights? Or florescent lights?
Are you replacing a 2-way or 3-way switch?
What color are your dimmer wires?
How many wires were connected to switch?
Can you re-install the switch, and know where each wire went?
Did you replace a light with a fan, and then want the dimmer to slow the fan? Not every dimmer will work with a fan, or florescent lights.
Dimmers cannot dim LED lights.

If I know what type switch you are replacing, and the type of load you want to control, and the specific dimmer you have, I can answer the question.

There is a constant transparent blue line down the middle of the screen

Your bacclighting sounds like florescent which means it constist of a series of tubes and if its isolated like that sounds like the tube that lites that part of the panel is failing.

Broan Fan surging and light flicking on and off


If it is a Florescent light, it may just need replacement. However, if it is a filament light, if it flickers on/off when the fan is active, there could be a wiring problem. But I doubt that...lOL :) It may just need a replacement starter sometimes if its a florescent, the tiny battery like thing that hangs a bit out :)

Acer 4720z LCD

Sounds like the backlight has gone. They are a florescent panel and like all florescent lights don't last forever. This is not something that is user serviceable, so it's time to book it in for a replacement panel.

Nintendo DS Lite

ummmm i dont know if you can do either of them i think you would be best of sending back to the makers ..... im pretty sure they are not replacable and i doubt fixable
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