Changing from CCFL to LED Display

The original inverter with the bulb in full brightness consumes 330mA@15.9V. To increase the battery runtime I was thinking of installing an LED-Light into the display. I was looking a long time for a small LED stripe, which can fit into the little gap of the metal bracket on the display. Finally I found it here: http://www.led-tech.de/en/Chip-On-B...hip-On-Board-SLIM-Module-LT-1446_134_141.html . I bought 2 of them for my CF-29 to connect them together and cut of the last 6 LEDs. They are brighter than the original CCFL!
Additionally I bought also the constant current power supply
(which replaces the inverter): http://www.led-tech.de/en/Chip-On-B...ply-for-COB--180mA,-30V--LT-1534_134_141.html which works very efficient and did not produce unnecessary heat and also have the possibility to regulate the brightness.
The power consumption is now 110mA in full brightness!
But now I have a problem: if I use the pwm controller of the toughbook the brightness is inverted, which means:
Ur toughbook is off -> LEDs are full on
Toughbook is on and Brightness is full -> Brightness is down
Toughbook is on and Brightness is down -> Brightness is full

I was trying of using an logic-inverter, but to my bad I was soldering at the PWM-pin in a unheeding moment, as the machine was on
Now I have no signal on the pin. I destroyed probably IC106 or IC107 (in the well known schematic of CF-29 Main14 LCD I/F 5F). And at the moment I have no idea, where to find the chips on the mainboard for repair.

Anyone can help me out?


Pics:

dismantling the display
don't touch the front of the display without gloves
dismantling the screen

 

next 6 pics:
dismantling the CCFL-bracket
on the pic with the connector from the inverter u can see 2 cutted wires- this are the plus wires. The next 2 wires right of them are ground and the last one is the pwm-signal.

 

And another 5 pics:
cut the LED-stripes
isolate the backside of them with tape
Testpictures

 

Is this a picture of the screen with the led installed? All I can say is good job if that is the case.

 

onirakkiss -

Well done, as usual. Are these strips wired in series or in parallel? What is the operating voltage of the full strip?

I AM curious about these things, though I am leery of the lifespan. However... for $45-50US, it seems like not a terribly expensive experiment.

mnem
Let's get dangerous!

 

@Klonsdale: Yes, this are testpics with the LED-stripes. Really bright! But on the bottom of the screen u can see the brighter points, where an led on the stripe is. I will also install an translucent plastic-stripe between the LED-stripe and the glas of the display to avoid this.

@mnementh: 3 LED are in series, 9 of them = 27 LED on one stripe. My second stripe I have parallel soldered on the first stripe and u can cut every 3. LED, if the stripe is too long. They work on 9,6V@180mA. Hope they will work a long time

 

This sounds very interesting, when you get all the details done would love to see a tutorial, this seems like it would help us cf-28 users whose screens are not as bright as the CF-29 with the added benefit of lower power consumption and increased battery life. Please keep us posted on your progress.

 

Wow, quite a re-engineering; I am very impressed! I am sorry for you setback but look forward to reading more.

 

Simply amazing!

 

Onirikkiss... With you being in the top 1% of the "wicked smart" crowd here... I'm left wondering who has enough brain power to help you.

Kudos to you! Looks like a fantastic mod and can hardly wait to see how this turns out. I don't have any spare monitors to play with but the first I do I'd like to help out.....

Please list tutorial when possible. We'll sticky it somewhere!