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May be the first X61 tablet with LED backlight...

X60/X61 series specific matters only.
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bp409
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May be the first X61 tablet with LED backlight...

#1 Post by bp409 » Wed Nov 03, 2010 3:40 pm

At first I want to excuse me about my bad english but I am from Bulgaria/Europe and this is not my native language.
Second - everything which is described below I've made on my own risk and if anyone tryes to duplicate any part of the text, has to keep in mind that with his actions one can destroy both LCD and/or a laptop motherboard, So I WILL NOT BE RESPONSIBLE FOR ANY DAMAGES CAUSED FROM THAT !

As you know one of the problems of the X61 tabled is a low brightness of it's CCFL backlight. According to that , before nearly half a year I had an idea to implement an LED backlight but due to lack of free time I succeed to realize it this week.
What were the main goals in this project :

1. to make a LED backlight which brightness will be not less than the CCFL one.
2. the power consumption of the driver + LEDs should not be more than that of the inverter+CCFL
2. to make a driver for those LEDs to drive them with their nominal current, and with constant and equal brightness for all leds.
3. to ensure those driver to be controlled like a standard CCFL inverter - with Fn+Home @ Fn+End buttons
4. to make the LED driver with the same dimensions like the inverter and the LED strip with same dimensions like a CCFL

First after a brief lookout over a original inverter I found a MP1010B IC which datasheet helped me to understand how it is controlled. So the main supply voltage is 19.8v , enable voltage is 3v and the brightness is controlled by 1.8v PWM signal. Also it was easy to find which pin of the connector is for what.
After a little search over Internet ,the best LED driver IC for conditions above was found - TPS61181 . It is for 60 leds and the leds which I've used are those - 0603 SMT 2300mcd WLED
Other thing that we will need is a donor inverter for a power connector and part with directional buttons for tablet mode (the circle next to the fingerprint sensor). I buy it from there - inverter .

Here are some pictures of the work process:

Image

from top to bottom : a green ruler :) ; PCB for 60 leds 2mm X 250mm; a part of the LEDs in 0603 body (small yellow dots on the black strip)
----------------------------------------------------------

Image

LED driver PCB which I've made by a foto-resist method and the small black square is the TPS61181
-----------------------------------------------------------

Image

on top is drivers PCB with electronic components already soldered and below it are soldered LEDs on their PCB; on the bottom is a donor CCFL inverter

----------------------------------------------------------------

Image

Closer look of a driver PCB

----------------------------------------------------------------

Image

LED strip is connected to the LEDs driver board.......

Image

... AND IT'S WORKING :D

------------------------------------------------------------------

Image

With the red arrow I've shown the part with the buttons which had to be glued to the LED driver board

------------------------------------------------------------------

Image

LED strip vs CCFL and at the top corner you can see glued part from the donor inverter

-------------------------------------------------------------------

Here you are some pict from the assemble of the new backlight

Image

Image

Image

Image

And a few pict on LCD disassemble ( I was a little bit nervous here :) )

Image

Image

Image

Image



And because this mod is nothing without comparison between both backlights , here it is :
I don't have luxometer so I've used my camera for before and after picture comparison

Image

Image

Up is with CCFL and below is with LEDs. I've took a picture in dark room with same camera exposure w/o a flashlight ,so as it seems the LEDs are a little brighter. YEEESSSS for now - and we can go to the next comparison....

Power consumption test:
I've measured both voltage and current on inverter and LED driver in working condition ,first on min brightness and than on max brightness.
Here are the data:
for CCFL inverter,min - supply voltage: 19,9v x 0,02amp = 0,398W
for LED driver, min - supply voltage: 19,9v x 0,02amp = 0,398W

as it seems the power consumption at min is the same, lets see on max...

for CCFL inverter,max - supply voltage: 19,8v x 0,21amp = 4,158W
for LED driver, max - supply voltage: 19,8v x 0,19amp = 3,762W

That's are nice results ,with less consumption on max we've got a little more brightness than a CCFL.

In conclusion I may say that all the 4 goals are more or less completed.
If you ask me does it worth all that work, investment,time , and risks took for a little more brightness, my answer is BIG NOO except if you enjoyed working with electronics like me and /or this is your hobby. I really enjoyed this project and the positive results from it.
Last edited by bp409 on Wed Nov 03, 2010 4:10 pm, edited 1 time in total.

dr_st
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Re: May be the first X61 tablet with LED backlight...

#2 Post by dr_st » Wed Nov 03, 2010 3:47 pm

bp409 wrote:In conclusion I may say that all the 4 goals are more or less completed.
If you ask me does it worth all that work, investment,time , and risks took for a little more brightness, my answer is BIG NOO except if you enjoyed working with electronics like me and /or this is your hobby. I really enjoyed this project and the positive results from it.
That's a good summary. :lol:

Congratulations on an amazing project. You have some serious skills! :bow:
Thinkpad 25 (20K7), T490 (20N3), Yoga 14 (20FY), T430s (IPS FHD + Classic Keyboard), X220 4291-4BG
X61 7673-V2V, T60 2007-QPG, T42 2373-F7G, X32 (IPS Screen), A31p w/ Ultrabay Numpad, A21m 2628-GXU

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Re: May be the first X61 tablet with LED backlight...

#3 Post by frankiepankie » Wed Nov 03, 2010 5:34 pm

Great mod!

LED's also have a much longer lifetime, and instant on/off switching.

Is dimming the backlight still supported? Or is it always on at full brightness?
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bp409
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Re: May be the first X61 tablet with LED backlight...

#4 Post by bp409 » Wed Nov 03, 2010 5:57 pm

Thank you very much for good words!

Yes , the LED driver is controlled from the same PWM signal circuit as a CCFL inverter so it support brightness dimming with the Fn+Home and Fn+End keys.
If someone is interested I can post a picture with the inverter connector pinout where comes the PWM and Enable signal for inverter (but tomorrow because here is 01:00 am and I am going to bed 8) )

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Re: May be the first X61 tablet with LED backlight...

#5 Post by Woodenspoon » Wed Nov 03, 2010 8:05 pm

sweet pictures:)

i'm impressed by your effort lol

way beyond my skill level

darn shame there is no drop in solution for these that i know of, i guess no one is making much 4:3 lcd anymore:(

craigmontHunter
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Re: May be the first X61 tablet with LED backlight...

#6 Post by craigmontHunter » Wed Nov 03, 2010 9:29 pm

Woodenspoon wrote:sweet pictures:)

i'm impressed by your effort lol

way beyond my skill level

*****Expletives removed by Moderator***** shame there is no drop in solution for these that i know of, i guess no one is making much 4:3 lcd anymore:(
Niche Market? I could see people buying this -especially if you could figure it out for older systems with failing CCFLs.

Amazing Job.

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Re: May be the first X61 tablet with LED backlight...

#7 Post by rkawakami » Wed Nov 03, 2010 10:57 pm

Harryc posted this earlier this year: http://forum.thinkpads.com/viewtopic.ph ... 60#p551260 Alas, no conversion for IBM is currently listed.
Ray Kawakami
X22 X24 X31 X41 X41T X60 X60s X61 X61s X200 X200s X300 X301 Z60m Z61t Z61p 560 560Z 600 600E 600X T21 T22 T23 T41 T60p T410 T420 T520 W500 W520 R50 A21p A22p A31 A31p
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Re: May be the first X61 tablet with LED backlight...

#8 Post by Tasurinchi » Thu Nov 04, 2010 4:02 am

Great job! Thanks for sharing... :thumbs-UP:
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Re: May be the first X61 tablet with LED backlight...

#9 Post by Ollo » Thu Nov 04, 2010 4:24 pm

Respect 8)

ajkula66
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Re: May be the first X61 tablet with LED backlight...

#10 Post by ajkula66 » Thu Nov 04, 2010 9:32 pm

Thanks a million for posting this...priceless... :bow: :bow: :bow:
...Knowledge is a deadly friend when no one sets the rules...(King Crimson)

Cheers,

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Re: May be the first X61 tablet with LED backlight...

#11 Post by Peak2Peak » Fri Nov 05, 2010 8:41 am

A truly impressive great posting - I hope this may set the stage for similar ccfl to LED mod's for other ThinkPads/laptops - :thumbs-UP: :thumbs-UP: :thumbs-UP:
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Re: May be the first X61 tablet with LED backlight...

#12 Post by bp409 » Fri Nov 05, 2010 11:29 am

Thanks again guys. Your reaction is enough reward for me :D

As I promise , an inverter connector pinout (if someone needs it )

Image

Have a nice day!

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Re: May be the first X61 tablet with LED backlight...

#13 Post by loyukfai » Mon Nov 08, 2010 10:43 am

Thanks for the post and the information!

Any plans to sell these as mod kits? How about one for the X41T?

bp409
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Re: May be the first X61 tablet with LED backlight...

#14 Post by bp409 » Mon Nov 08, 2010 12:09 pm

loyukfai wrote:Thanks for the post and the information!

Any plans to sell these as mod kits? How about one for the X41T?
Sorry but no! As I mentioned above this is only a hobby for me. My job is entirely different and it's hard for me to find free time for such a mods ,not to mention that for x41t I have to start from scratch because of a different inverter.

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Re: May be the first X61 tablet with LED backlight...

#15 Post by bluesceada » Sat Apr 23, 2011 5:40 am

Hi, I am also very interested in maybe doing this for a normal X61. I am kind of used to tinkering with electronics an etching PCBs at home, so I should be able to do this.

Just one question: Where did you get the PCB for the row of LEDs from, or did you make it yourself? I think this might be critical to have really the right size to fit where the CCFL was before... or isn't it?

And: Could you post the Schematic of your driver board? That would make it easier for me ;-)
(How did you use the TPS61181? Looks like you used 6 sink channels, how did that fit on the small LED strip?)

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Re: May be the first X61 tablet with LED backlight...

#16 Post by bp409 » Sat May 28, 2011 11:17 pm

Too late post but I rarely check the forum ...
So, this is what I found on my computer ,hope it will help. Sorry that I'm not keeping Eagle files of the pcb ....
Download led driver.jpg from FileFactory.com

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Re: May be the first X61 tablet with LED backlight...

#17 Post by bluesceada » Sun May 29, 2011 4:36 am

Thanks! Not too late, I don't have time to do this right now anyway, but I might have in summer.

I hope this can help me, but I might just start with an own schematic and just look at yours in case I encounter some issues with the layout.

So you really etched the LED strip yourself? Did you also cut the PCB for it yourself? This is one of the bigger problems I see for me... to get the exact right size of the small light-strip PCB :?

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Re: May be the first X61 tablet with LED backlight...

#18 Post by X61-Stand » Tue Jul 19, 2011 9:45 pm

@bp409. If you're still around, I've been looking at using the new X201 LCD lamp as an upgrade for the X61. From your experience, do you think it would work? I think it's about the same size screen, a little shorter in the vertical direction, I think.

See http://www.batterycentury.com/lenovo-th ... 86714.html
http://store.lcdparts.net/LB20265LED5720_p_3657.html#

There's also this site, but, I haven't found anything specifically for Lenovo:
http://www.lcdparts.net/LI3D.aspx

So, there's lots of "parts" floating around.

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Re: May be the first X61 tablet with LED backlight...

#19 Post by crashnburn » Tue May 28, 2013 2:51 pm

I received a reply notification on this thread from the forums but it appears the post is gone.

PS: Did anyone else actually successfully do this with working Tablet functionality?
T61 8892-02U: 14.1"SXGA+/2.2C2D/4G/XP|Adv Mini Dock|30" Gateway XHD3000 WQXGA via Dual-link DVI
X61T 7767-96U: 12.1"SXGA+/1.6C2D/3G/Vista|Ultrabase
W510 4319-2PU: 15.6"FHD/i7-720QM/4G/Win7Pro64 (for dad)
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Re: May be the first X61 tablet with LED backlight...

#20 Post by rkawakami » Tue May 28, 2013 7:38 pm

I removed a spammer's post last Saturday. At least the notification system is (or was) working :) .
Ray Kawakami
X22 X24 X31 X41 X41T X60 X60s X61 X61s X200 X200s X300 X301 Z60m Z61t Z61p 560 560Z 600 600E 600X T21 T22 T23 T41 T60p T410 T420 T520 W500 W520 R50 A21p A22p A31 A31p
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Re: May be the first X61 tablet with LED backlight...

#21 Post by vavet » Mon Jun 03, 2013 2:53 am

hi,
Yesterday finished my led conversion project!!!
used this
http://www.iccfl.com/product_info.php?c ... s_id=11862
and it worked !!!

the inverted was included. It was an original inverter with modifications. So it was a simple replacement of the inverter.
As for the replacement of the back light, this wasn't that easy. I had already replaced my x61s screen with with a sxga+ (1400x1050). And the problem is that the backlight on these screens (HV121P01-100) is attached to the panel with a double sided sticky film. so taking it out without tearing the screen apart is a bit tricky. But I succeeded with some patience and accuracy. the ccfl lamp was in a metal box (u-shaped) and I just took the ccfl lamp out and put the led strip init.
Worked like a charm. and the brightness level control works fine as well.

I think that with the original xga screens it should be much easier.

Unfortunately I didn't take photos of the project, but can post the results later today.
X61 (T9300, 8gb RAM, 120gb SSD, LED SXGA+, integrated webcam, invisible touchpad, modded battery etc.)

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Re: May be the first X61 tablet with LED backlight...

#22 Post by vavet » Mon Jun 03, 2013 3:05 am

Thaks for the writeup, it is really great especially for the pinout diagram, I was looking for it before but couldn't find one.
X61 (T9300, 8gb RAM, 120gb SSD, LED SXGA+, integrated webcam, invisible touchpad, modded battery etc.)

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Re: May be the first X61 tablet with LED backlight...

#23 Post by crashnburn » Mon Jun 03, 2013 6:15 am

vavet wrote:hi,
Yesterday finished my led conversion project!!!
used this
http://www.iccfl.com/product_info.php?c ... s_id=11862
and it worked !!!

the inverted was included. It was an original inverter with modifications. So it was a simple replacement of the inverter.
As for the replacement of the back light, this wasn't that easy. I had already replaced my x61s screen with with a sxga+ (1400x1050). And the problem is that the backlight on these screens (HV121P01-100) is attached to the panel with a double sided sticky film. so taking it out without tearing the screen apart is a bit tricky. But I succeeded with some patience and accuracy. the ccfl lamp was in a metal box (u-shaped) and I just took the ccfl lamp out and put the led strip init.
Worked like a charm. and the brightness level control works fine as well.

I think that with the original xga screens it should be much easier.

Unfortunately I didn't take photos of the project, but can post the results later today.
Thanks for the link. Not a bad price to buy and keep for a project when the mod mood strikes. Effort though!
T61 8892-02U: 14.1"SXGA+/2.2C2D/4G/XP|Adv Mini Dock|30" Gateway XHD3000 WQXGA via Dual-link DVI
X61T 7767-96U: 12.1"SXGA+/1.6C2D/3G/Vista|Ultrabase
W510 4319-2PU: 15.6"FHD/i7-720QM/4G/Win7Pro64 (for dad)
T43 1875-DLU: 14.1"XGA/1.7PM-740/1G/XP (Old)

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