Questions tagged [ccfl]
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29 questions
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CCFL(Cold-cathode fluorescent lamps) Power Source
I'm trying to understand how the inverter of a CCFL works. The CCFL was used as the backlight of an old Samsung TV.
It seems that the inverter output(secondary winding of the transformer) is a high ...
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Why does my monitor back side become energized after CCFL to LED repair?
I am repairing my old monitor Samsung syncmaster 740b from not working CCFL lamps to LED lights with a led driver. I just had a first test. I have got electricity hit, investigation shown my metal ...
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Can I use a laptop backlight inverter as a tube power supply?
I would like to build a circuit that has a magic eye in it. That needs ~290V. I was wondering if I can/should use a CCFL inverter (salvaged from an old laptop) to generate that voltage, maybe driving ...
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Is it possible to drive LEDs using CCFL inverters?
I have a Tektronix oscilloscope with a CCFL backlit LCD. The CCFL tube is toast and rather than replace it with another one that will fail, I figured I would use the opportunity to replace it with a ...
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OZ960 Intelligent CCFL Inverter Controller Diodes on OVP pin
I can't understand the purpose of the two diodes (at the red box on the picture) and how they work? Between the two capacitors the "1" diode cut off them from the GND because it is in ...
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Is there a way to dim CCFL lamps in a monitor backlight?
I use 30 inch monitor Samsung 305t that uses 16 CCFL lamps as a direct backlight. The driver consists of 8 HV transformers, each of them running 2 lamps in series. Some info about the lamps:
As you ...
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What is the typical voltage for driving LCD fluorescent backlight tubes?
I ran into this old cockpit/pilot room for heavy mining machinery in which there was an LCD display that's not lit properly, that is, the image was there but the backlight clearly was gone.
Upon ...
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Drive a magnetron with low power via a CCFL backlight driver
[EDIT] My real question here is: can a magnetron from a microwave oven be used to output low power microwaves? If so, how can I achieve this? If not, what is a source for low power microwaves? In this ...
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Extension for CCFL tubes
I have an inverter for cold cathode lights powered via a molex connector from a PC power supply, with a PCI/PCI-E slot bracket where is placed an ON/OFF switch, and I would need to use one light at a ...
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High voltage output from CCFL backlight transformer?
I have an old television inverter board I've been meaning to turn into a power supply for a plate-deflected oscilloscope CRT *. I'm not really an expert on transformers, however, and though I have ...
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Do cold cathode fluorescent lights (CCFLs) degrade as a function of idle time?
I have a HP LP2475w display with a cold cathode fluorescent light (CCFL) backlight. It is approximately 8 years old. However, it has only 9041 backlight hours, meaning it has been used for only 12.9% ...
- 1,906
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How to connect LCD backlight wires [closed]
I have bad caps in my LCD monitor. While taking it apart, I disconnected the LCD backlight wires to get to the power supply. I blame bad product design and my own stupidity for not checking how the ...
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Confusion about ccfl inverter transformer
I have this transformer that came from a ccfl inverter and the pins on it are confusing me a bit.
I've tested every pin and only pin 3 and 6 seem to form the primary winding and somehow pin 1 and 8 ...
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CCFL wire polarity; any considerations?
Are there any considerations for the polarity of wires on a CCFL tube?
I am converting a monitor from 120vAC to 12vDC using a generic inverter (AVT4029; also have AVT4168 not pictured) and LCD driver ...
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How to power CCFLs from backlight using original inverters (from a disasembled LCD screen)
I've search the net and dealers for specs of these inverters, no chance!
I'd like to make somme discreet lightings with the CCFLs, as the screen was disasembled in a hurry, without noting the ...
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Negative Voltage Ccfl Inverter from AC Adapter
I have a CXA M10M-L ccfl inverter and I need negative voltage from its output, for anode ground scheme of a photomultiplier tube. I am confused because most discussions of this topic use batteries to ...
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cheapo CCFL LCD keeps colour-drifting - what is the cause? [closed]
My display's (Phillips 231E) white point drifts continiously. Once I have created profile for it it will be fine for some time but then it will shift slightly or badly.
For example: in some cases I ...
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Can a piezoelectric inverter for CCFL work for similar sized neon tubes?
I've done some backlight work for instrument displays using CCFLs and designing custom drivers (12 Vdc to ~1000 Vac) so I have some experience with these designs. Recently a friend of mine was ...
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Dimming CCFL:s with PWM or amplified analog voltage
First post here. I have been trying to get this project going for a while, but I now think it is time to ask for help.
I want to build an array of cold cathode fluorescent lights (CCFL:s). The ...
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Lumen difference between CFL and LED
How much watt I need for LED bulb to get the same amount of light produced by 32 Watt CFL bulb?
So, comparing lumen is the right way to find out the difference between these two light source?
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Can low brigtness extend life of CCFL lamp in laptop LCD backlight?
I have really good and old laptop (IBM t60p with t61p board). I just replaced whole screen because CCFL lamp died after many years.
Can I extend life of CCFL by using laptop with reduced brightness ...
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LCD screen with a dark patch, hot, hissing and whole screen flickering: what is happening exactly?
I've just had a problem with an LCD monitor, but this question is not about solving this problem. Google did that. I want to know what is happening at the electronic and physical level. Google didn't ...
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How to make a dimmer for a 11W CFL?
I have a desk lamp, that uses 11W/827 CFLs (current one is an Osram Dulux S)
The lamp uses a power supply ("Type BL1"), but it seems the transformer acts more like an AC/AC power converter, as it ...
- 1,097
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Switching cold cathode fluorescent lights on and off without relay?
I have a few sets of 2-in-1 CCFLs that are designed to be powered off the 12V rail of a computer PSU. I'm planning to build a large 7-seg display using them so I'd like to be able to switch them on ...
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Electron Carbonization issue related to inductors and ballasts
I have searched on the internet and I found nothing on this area. Not even a wiki
page, and not on several book glossaries.
This is related to the CCFL ballasts and inductors that used to control the ...
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Inputs on Samsung CCFL Inverter
I am trying to use the backlight from a Samsung laptop for a light box but have NO idea what the input connections are. I've found some Datasheets for other models but not the right one. LTN141XB-L01
...
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LCD backlight CCFL lamps power supply
I have a quantity of LCD panels (from a wide range of dead laptop) and I would like to use only the CCFL + diffusors as a "creative" light source for a room in my house.
Is there some sort of "...
- 3,508
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How would I go about replacing a CCFL laptop LCD scrren backlight with LEDs?
Are there certain kinds of LED(s) that should be used? Is there a certain way the LED(s) should be put? If yes to any of these questions, why? Also, where is a good place from the laptop to get power ...
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Why does a CCFL in an LCD have a bigger pink lead and a small white lead?
After removing the dead CCFLs from an LCD monitor, I noticed something odd. Although both wires go to different ends of the tube and presumably carry identical currents, they are visibly and ...
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