Inverter tester using old CFL

[Bob1984]

Re: Inverter tester using old CFL

Hi this is my first post and ask, what the symbol/name of connectors of like a thread autor badm, i ask becouse i have the same in may monitor Benq E2420HD, or where i can buy this connectors.

Thanks

[Agent24]

Re: Inverter tester using old CFL

I am not sure of the technical name of the connector, but you could buy them on eBay with the wires already attached.

I bought http://www.ebay.com/itm/10pcs-33cm-L...-/170901888573
and some http://www.ebay.com/itm/1pc-1m-Unive.../190718837578?

Only problem is they don't sell either of those anymore. You can maybe try Aliexpress, or just take old plugs\wire from a smashed screen or something.

Make sure you if you need to extend the cable that you use proper HV-rated cable with correct insulation, at least 1.5kV rated I think for small screens\lamps, probably want 3kV for bigger ones, same for the heatshrink too of course.


Another option too of course is to just solder the wires underneath the PCB, to the existing solder joints on the pins of the socket on the inverter board during testing, then you don't need plugs.

[budm]

Re: Inverter tester using old CFL

http://www.ccflwarehouse.com/hivowiandha.html

[Bob1984]

Re: Inverter tester using old CFL

Thanks for help

[knoxrebel]

Re: Inverter tester using old CFL

Cool Idea, I work on a lot of laptops and salvaged a double backlight assembly and have been using it for years. Never thought about using a 120v cfl.

[rxyzm]

Re: Inverter tester using old CFL

Hi,

I joined this forum some time ago, but, have remained an infrequent visitor due to job, life and such things.

I saw many posts about opening the CFL by using hacksaw, Vice etc.

I use a fine flat-blade screwdriver that is sturdy (Should not be watchmaker's flat-blade). Just push the blade in to the slot between the cap and lamp base and twist the blade. Some time you may need to poke at 3 - 4 different spots around the circumference of the bulb.

I normally collect the high voltage (AC rectification side) electro-caps and different inductors from these boards. I have found inductors are not readily available in the markets.

[cleverone]

Re: Inverter tester using old CFL

Thank you so much for learning in this site.

[Me.Orouji]

Re: Inverter tester using old CFL

Good job

[cwolford]

Re: Inverter tester using old CFL

hope its okay to bump this.

I have a philips 47pfl5704d / f7 aka (47" lcd tv) with back light issues.

see my thread here: https://www.badcaps.net/forum/showthread.php?t=60783

see my photo: do i just hook up 2 cfl to the psu at the orange triangle?

or is that powering the lcd? I could not locate an inverter board by its self.

the photo is of another tv, but very close to mine

[budm]

Re: Inverter tester using old CFL

It looks like that LCD panel as shown in the picture used EEFL, not CCFL.
What is your LCD panel model number?

[cwolford]

Re: Inverter tester using old CFL

i will have to look tomorrow if i can find it. its 12:25 am here.

[cwolford]

Re: Inverter tester using old CFL

It looks like that LCD panel as shown in the picture used EEFL, not CCFL.
What is your LCD panel model number?

had to rip this thing apart to get this haha.

[budm]

Re: Inverter tester using old CFL

OK, LC470WUF, see spec sheet.
it does use CCFL and it has circuit board inside the panel with Balancer cap for each tube, similar setup to this one with a bunch of failed Ballast caps:
http://s807.photobucket.com/user/bud...?sort=3&page=1

CCFL-EEFL info, see page 3.

[cwolford]

Re: Inverter tester using old CFL

OK, LC470WUF, see spec sheet.
it does use CCFL and it has circuit board inside the panel with Balancer cap for each tube, similar setup to this one with a bunch of failed Ballast caps:
http://s807.photobucket.com/user/bud...?sort=3&page=1

CCFL-EEFL info, see page 3.

So tear it back down dig deeper look for bad caps. Thanks for the reply

[budm]

Re: Inverter tester using old CFL

Not yet, see your other thread.

[BookWormStud]

Re: Inverter tester using old CFL

Can we use this method to check the LED Driver board in the new LED TV where LED Driver board is separate from the Power Supply Board, like in this

Panel is LC500DUE SF/R1

[gadget]

Re: Inverter tester using old CFL

thanks . good idea and now i can test my small sanyo DP19640b 19.2inch led tv. IT lights up and works for about a minute cold then goes dark . every power recycle from then on makes it come on for about 30 seconds and goes dark with sound still there . i was told it might be the backlight . very odd as its the first one i have seen go bad or wear out. its almost always the inverter . i will try it and then i will know !

[budm]

Re: Inverter tester using old CFL

CFL is not for testing LED backlights circuit.

[SkOrPn]

Re: Inverter tester using old CFL

I force the bl_on line on mt tester board, you will have to have your monitor connected to the running PC but you do not need to have the screen T-CON connected.
You have to have 4 working lamps, if one failed or not connected, the inverter will go onto shutdown mode.

Is this also true for the 6 CCFL's models such as the 2407WFPb?

Also, do you think those UV CCFL's would work too? I am an old school computer enthusiast who's been custom building rigs for 30+ years and I have lots of UV type CCFL's, the kinds you use to make PC's look nice and glowing. The one I was thinking of trying is at the link below.

http://www.frozencpu.com/products/10...Tube_-_UV.html

[momaka]

Re: Inverter tester using old CFL

That's a very interesting idea SkOrPn. Technically... or as far as I know... those CCFLs have similar voltage and current requirements, so you might be able to use one to test a monitor inverter. I'm actually very curious if that will work, as there's a computer store near me selling an UV CCFL kit (2 lamps + inverter) for $4 total. Sounds like a good deal to me.

Now, as far as replacing the CCFLs in a monitor with UV CCFLs - I don't know about that. Most likely the colors would be way off or not there at all, as you need a white backlight. And also, a CCFL like that probably won't fit inside a monitor.