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R60 LED mod - inverter board - DIM?

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natumbri
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Location: Melbourne, Australia

R60 LED mod - inverter board - DIM?

#1 Post by natumbri » Tue Sep 15, 2020 6:16 am

Hi,

I'm trying to install a LED strip backlight in my R60 15" 4:3.
The inverter is a FRU 41W1126.
I have a Unboosty-Blue driver board, which I will modify to take a pwm dimmer input.
I have instructions for getting VIN, GND and ENA off the inverter board, but I don't have a location for DIM (the pwm signal that I'll feed the driver board).
Image
Can anyone assist?

Cheers,
Nik
T43 (2686-A37 + SXGA+) [broken]; R51 (2888-KM2)
X60 (1706-MPM); T60 (2623-A11)
R60 (9459-AQ9, LED mod)
R601 (originally 9459-AQ9, now 42W7822 + T7500 + SSD + SXGA+)
T500 (CTO; T9600, WSXGA+, SSD)

natumbri
Posts: 14
Joined: Wed Mar 30, 2016 2:30 am
Location: Melbourne, Australia

Re: R60 LED mod - inverter board - DIM?

#2 Post by natumbri » Tue Sep 15, 2020 7:05 pm

So the lamp driver IC on the 41w1126 seems to be the same lamp driver that IBM/Lenovo use on other inverter boards:
MP1010BEF

In PWM mode, it is recommended that the PWM signal should be connected to the DBRT pin (pin 4) directly. So that's where I'll look.

This amazing bit of pioneering work has some clues:
viewtopic.php?p=600367#p600367
T43 (2686-A37 + SXGA+) [broken]; R51 (2888-KM2)
X60 (1706-MPM); T60 (2623-A11)
R60 (9459-AQ9, LED mod)
R601 (originally 9459-AQ9, now 42W7822 + T7500 + SSD + SXGA+)
T500 (CTO; T9600, WSXGA+, SSD)

RealBlackStuff
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Re: R60 LED mod - inverter board - DIM?

#3 Post by RealBlackStuff » Wed Sep 16, 2020 2:11 am

Those inverters are made by Hitachi, I think this is what you are looking for: https://i.imgur.com/iVQi9dC.jpg
Lovely day for a Guinness! (the Real Black Stuff). And pigs CAN fly!
Check out The Boardroom for Parts, Mods and Other Services.
Covid-19: Mask it or casket.

natumbri
Posts: 14
Joined: Wed Mar 30, 2016 2:30 am
Location: Melbourne, Australia

Re: R60 LED mod - inverter board - DIM?

#4 Post by natumbri » Wed Sep 16, 2020 5:22 am

Thanks RBS - I actually went ahead and did it before you posted, using the PWM pin info from the datasheet.

I didn't have too much trouble with the inverter board, or modifying the led driver for PWM.

What I did have trouble with was getting the CCFL out of the LCD. I completely stuffed up the first one I tried. But I learnt what the inside of a LP150X08 LCD looks like. The second one went better and I managed to get the lamp out and the LEDs in without breaking anything.

Wired it all up and closed it all up. The led driver fits where the coil for the cclf used to be.

Results are pretty good, except there's a slight dimmer patch in the bottom LHS of the screen - possibly I didn't push the LEDs far enough to the left? Not incredibly annoying, except that it's not perfect.

Image

LED v Unmodified.

Now, that was a low risk project - crappy xga display, that I had a spare for anyway (luckily). Question is: should I do this again on my (dim, yellow-green) T60 SXGA+ screen?

I have the bits, do I have the courage...

(I will not be putting a LED backlight into my SXGA+ R601 - it looks great just as it is, now that the EDID thing is sorted out.)
T43 (2686-A37 + SXGA+) [broken]; R51 (2888-KM2)
X60 (1706-MPM); T60 (2623-A11)
R60 (9459-AQ9, LED mod)
R601 (originally 9459-AQ9, now 42W7822 + T7500 + SSD + SXGA+)
T500 (CTO; T9600, WSXGA+, SSD)

RealBlackStuff
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Re: R60 LED mod - inverter board - DIM?

#5 Post by RealBlackStuff » Wed Sep 16, 2020 5:41 am

I posted this years ago: viewtopic.php?f=31&t=88991

BTW: your pictures are not accessible, that Google Drive says:
Access denied.
You need access.
Ask for access, or switch to an account with access.

(I don't have a Google Drive, nor do I want/need it...)
Lovely day for a Guinness! (the Real Black Stuff). And pigs CAN fly!
Check out The Boardroom for Parts, Mods and Other Services.
Covid-19: Mask it or casket.

atagunov
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Re: R60 LED mod - inverter board - DIM?

#6 Post by atagunov » Wed Sep 16, 2020 7:07 am

@natumbri: just checking - you have removed the transformer, haven't you?
As RBS said it's not possible to view your images, I also get "Access denied". Would you like to upload to imgur.com instead?
Also perhaps the most interesting question of all - what kind of LED strips are you using?
X220, 2 *T520

natumbri
Posts: 14
Joined: Wed Mar 30, 2016 2:30 am
Location: Melbourne, Australia

Re: R60 LED mod - inverter board - DIM?

#7 Post by natumbri » Wed Sep 16, 2020 7:56 am

Yes, thanks RBS - I read that very informative post about replacing a CCFL; I just managed to stuff it up the first time around, despite the assistance available. Oh well, live and learn.

The Google drive errors should be fixed now - I forgot to turn sharing on. Let me know if it is still broken.

As for LEDs, I bought a pair of strips and drivers for ~AUD$20 from AliExpress: https://a.aliexpress.com/_msdvGWR.

The driver boards turned out to be Unboosty-Blue. I applied the PWM mode mod, although I didn't bother with the current sense resistor. Probably should have, although maybe less important for a 15" screen (more LEDs and resistors in the strip than for the 12.1" @xiphmont was working with)? Also, didn't have a low profile inductor - it fits OK with the standard inductor, but would be better with low profile.

I did remove the transformer, and the CCFL plug from the inverter board. That left enough space for the led driver board (which has a plug on it).
T43 (2686-A37 + SXGA+) [broken]; R51 (2888-KM2)
X60 (1706-MPM); T60 (2623-A11)
R60 (9459-AQ9, LED mod)
R601 (originally 9459-AQ9, now 42W7822 + T7500 + SSD + SXGA+)
T500 (CTO; T9600, WSXGA+, SSD)

atagunov
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Posts: 337
Joined: Thu Apr 02, 2020 3:11 pm
Location: London, UK

Re: R60 LED mod - inverter board - DIM?

#8 Post by atagunov » Wed Sep 16, 2020 8:40 am

He he great work, congrats on replacing the backlight! After investing this much effort I wouldn't hesitate to use the machine even if bottom-left corner was a bit too dark.

It seems you chose not to remove the IC and diode bridge that Monty suggested for removal from R60 stock inverter?
How are the colors after the mod?
Does the resulting max/min brightness make sense?

Looking closer it seems AliExpress item photos show Unboosty, but they actually sent you an Unboosty blue?
That's probably good since blue is a bit better to work with isn't it..

We should really get permission from Monty and Bill Morrow and get a copy of Monty's website hosted on thinkpads.com.. Possibly with some new instructions and that photo from RBS :)
X220, 2 *T520

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