Take a look at our
ThinkPads.com HOME PAGE
For those who might want to contribute to the blog, start here: Editors Alley Topic
Then contact Bill with a Private Message

EDID-chip location on X230, X240, X250 and newer FHD screens

X230 and later series specific matters only
Post Reply
Message
Author
RealBlackStuff
Admin Emeritus
Admin Emeritus
Posts: 20021
Joined: Mon Sep 18, 2006 5:17 am
Location: Dublin, Ireland
Contact:

EDID-chip location on X230, X240, X250 and newer FHD screens

#1 Post by RealBlackStuff » Mon Mar 25, 2019 2:33 pm

Who knows exactly where the EDID chip is located on LG IPS FHD screens such as used in FHD-modded X230, X240, X250 etc.?
Talking specifically here about LP125WF2-SPB2, LP125WF2-SPB3 and LP125WF2-SPB4

PS: never mind any mounting holes, they can be removed.
Lovely day for a Guinness! (the Real Black Stuff). And pigs CAN fly!

RealBlackStuff
Admin Emeritus
Admin Emeritus
Posts: 20021
Joined: Mon Sep 18, 2006 5:17 am
Location: Dublin, Ireland
Contact:

Re: EDID-chip location on X230, X240, X250 and newer FHD screens

#2 Post by RealBlackStuff » Tue Mar 26, 2019 3:54 pm

Found it:
You need to turn the screen over (rear facing you), then carefully peel the black tape from the PCB-strip.
You'll see a metal rectangle, that also needs to be removed (optional, read on first).
Underneath that piece of metal is the TSSOP8 EDID-chip, tiny, with 8 legs.
When you turn the LCD over again, you lift the black tape from the PCB-strip again.
You'll now find 5 EDID solder pads/test-points underneath the location of the EDID-chip.
Pad WP-7 (Write-Protect) is the one I'm after.
For pictures, see this: https://imgur.com/a/WHSZ4iM

AFAIK if you connect WP via a 10kOhm to GND/Vss you remove the write-protect.
Another option may be to unsolder/cut that WP-7 leg from the EDID and leave it 'hanging/loose, to achieve the same.

Once the WP is removed, any EDID Read/Write program can be used to modify the EDID content
and get BRIGHTNESS CONTROL working!

I have NOT YET tested any of the above.
That's why I really want some experienced person's opinion on which method is the best, or whatever else...

Tasurinchi
Moderator
Moderator
Posts: 2116
Joined: Mon Aug 17, 2009 8:38 am
Location: Zurich, Switzerland

Re: EDID-chip location on X230, X240, X250 and newer FHD screens

#3 Post by Tasurinchi » Wed Mar 27, 2019 3:27 am

RealBlackStuff wrote:
Tue Mar 26, 2019 3:54 pm
And get BRIGHTNESS CONTROL working!
Hats off! :thumbs-UP: :thumbs-UP:

That was some serious detective work you got done...
IBM Convertible 5140/L40SX/220/240/240X/2*340CSE/360PE/365XD/380D/380E/380XD/380Z/390/560E/560X/2*570/2*600/600E/750Cs/755C/760CD/760EL/760XD/770E
A20p/A22p/A31/i1600/G40/R50p/R61i/S30/SL510/2*T22/4*T4x/11*T6x/6*T40x/6*T5x0/3*W5x0/W700/3*X2x/4*X3x/3*X4x/5*X6x/3*X6xT/12*X2xx/4*X30x/Z60m/3*Z61x

RealBlackStuff
Admin Emeritus
Admin Emeritus
Posts: 20021
Joined: Mon Sep 18, 2006 5:17 am
Location: Dublin, Ireland
Contact:

Re: EDID-chip location on X230, X240, X250 and newer FHD screens

#4 Post by RealBlackStuff » Wed Mar 27, 2019 3:21 pm

For those that don't want to bother with EDID-programming, try this: DimScreen

Thinkpad4by3
Senior ThinkPadder
Senior ThinkPadder
Posts: 2562
Joined: Sun Aug 09, 2015 9:25 am
Location: N. Bellmore, ny

Re: EDID-chip location on X230, X240, X250 and newer FHD screens

#5 Post by Thinkpad4by3 » Wed Mar 27, 2019 3:37 pm

RealBlackStuff wrote:
Wed Mar 27, 2019 3:21 pm
For those that don't want to bother with EDID-programming, try this: DimScreen
I can confirm this program works for dimming the screen....just not in saving my battery life.
Thinkpad4by3's Law of the Universe.

The efficiency of two screens equally sized with equal numbers if pixels are equal. The time spent by a 4:3 user complaining about 16:9 is proportional to the inefficiency working with a 16:9 display, therefore the amount of useful work extracted is equal.

Post Reply
  • Similar Topics
    Replies
    Views
    Last post

Return to “ThinkPad X230 and later Series”

Who is online

Users browsing this forum: No registered users and 16 guests