Re: Opinions on converting CCFL to LED
you can try a thin wire to connect 19v to converter..
you can try a thin wire to connect 19v to converter..
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Re: Opinions on converting CCFL to LED
Hi guys. That is actually a good idea spidey. The fact that the raw b+ is at the connector with no connection to the cable tells me that they did not intend to run this circuit with 19 volts into the inverter. My theory is that the 5 volt output going into the led backlight is not enough to drive it consistently hence the erratic problems. I took that same cable and screen and put it in my L455D with the 19v output and it works just fine. In fact, the data sheets for most of these led screens say the minimum voltage in is 6 volts. Your thoughts on my theory are appreciated.Comment
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Re: Opinions on converting CCFL to LED
Ok. I have confirmed that this board does not use raw b+ to power the inverter. Sourced the inverter part number to find that 5 volts is on pin 5 and 6 going into it. Cant find a schematic for this particular model online but got close with another. If proper operation for this led cant be maintained with the led driver board I have; I will have to take spidey up on his suggestion. I still have not answered the question as to why raw b+ is at the connector but not being used.Comment
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Re: Opinions on converting CCFL to LED
I know this is an old thread, but to anybody reading, please advise.
On my blog I document some of these LCD to LED Conversions
http://billa48.blogspot.com/
But I am stumped here. I have a Toshiba L505 and a L455, they both came with CCFL Screens, now the screens are cracked and I am trying to replace them with 15.6" LED screens.
I have all types of conversion cables and the little inverter thing. I have tried everything to the best of my knowledge. The L455 does show the desktop but no backlight on the LED screen. The L505 shows desktop and LED backlight lights up good for 5 minutes, then it turns on and off by itself, regardless of where the brightness control is.
I need a straight forward way to put these 15.6" screens into these laptops.
I have converted a Lenovo G555, and Inspiron 1545 with these same cables, worked good.
Please advise.Comment
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Re: Opinions on converting CCFL to LED
What I am fixin to do now, take apart these screens and paste them on top of the old CCFL backlight panels. Since I have display only backlight is amiss. I have done that many a times with CCFL screens, swapped out working screens with dead backlight over working backlight panels with cracked screens.Comment
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Re: Opinions on converting CCFL to LED
Yeah but arent the flat flex things at the bottom on LED screens? and at the top on CCFL ones so it could work but the screen would be upside down and thats if the glass part would fit into the frame where the backlight and all those diffuser layers areComment
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Re: Opinions on converting CCFL to LED
90% of the time the glass screen part will fit right on top of the ccfl or led backlight panel. Some plastic tab cutting may be required. These tabs are on the backlight panel, they go between the flat belt on the glass panel. If you slice them off any sort of flat cable can be seated properly.
Check my blog I have ghetto-teched what used to be a CCFL backlit screen on top of a LED backlight panel that had a cracked screen. It works both ways. And no the screen does not have to be upside down. CCFL backlight screens usually have backlight tubes in the bottom, LED backlight screens have LED bulbs in a strip in the side of the screen. So regardless of what format you put it together, you can always flip the screen, with the conversion cable you have enough room to turn the screen upside down hence, upright. So it works like an extension.
Same way, a screen with bad CCFL lamp can be transplanted on a cracked screen with good CCFL lamp. Instead of diggin out the lamp and breaking it in the process. Most manufacturers screens look exactly the same, some require adjustments, others just cut and paste. Only factory CCFL screens from HP laptops will be dim on Dell, toshiba, acer laptops. Even if you change the backlight. That applies to all 14.1, 15.4, 15.6 screens.Comment
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Greetings everyone,
I have a HANNSG Hi221 monitor that exhibits two seconds to black issues (backlight goes off, display is still on as confirmed by shining a flashlight on it) with some additional oddities...
The monitor failed on me with a standard "2 seconds to black" some time ago prompting me to initially replace most of the electrolytic capacitors (some of them were bulging/leaking).
Things kinda sorta worked for a night, then the problem returned along with some flickering and "buzzing" noises.
Upon closer inspection... -
Hi Badcaps,
You helped me replace some bad caps a few years ago and I'm hoping you can help me turn the CCFLs in those monitors into LEDs. I've attached pictures of the PS from my monitors and of the LED driver boards.
I've also included the threads I was looking at to accomplish this on my own but I'm daunted by the task. Unfortunately, those threads peter out before the conversion is replaced. If I can get some help here, I'll be glad to post complete finished conversion pics.
I'm not really looking to remove as much stuff for a "clean" install... -
Hello all! Recently one of my two LG Flattron W2442PAs kicked out with the 2 seconds to black issue. After coming across a thread with a similar issue and performing some tests using my other fully functioning W2442PA, I had determined that the issue was with the CCFL bulbs (as the board from the bad monitor would drive the good monitor's backlights without tripping the CCFL protection, and vice versa the good monitor's board would trip the CCFL protection when hooked up to the bad monitor's CCFLs).
So to resolve this issue, I ordered a LED Backlight Strip Upgrade Kit from ebay,...05-25-2020, 12:47 AM -
Hi,
This monitor previously is my main working monitor which i have been using for 8~9 years. Yesterday, when i switched on my pc from fresh to power on, the monitor is just black no display. I started dismantle to look inside the monitor power board but nothing looks suspicious or burnt. So i took my external ccfl inverter to try to power the monitor ccfl lamps which consisted of 2 lamps on upper part and 2 lamps on the lower part.
Found out the upper ccfl lamp which is supposed to connect to cn304 on the power board did not light up. Then i installed a used working... -
I decided to give this a go, I ordered some led strips to go in the 40in lcd. Would the 24v that feed the inverter board be enough to run the strips or should I add a led driver board? Should the strips be wired in series or parallel?
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