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L512 Dispay replace FHD problem

SL300/SL400/SL500, L400-L420 and L500-L520 Series
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Gee1
Posts: 5
Joined: Wed Jan 05, 2022 11:58 am
Location: Chemnitz, DE

L512 Dispay replace FHD problem

#1 Post by Gee1 » Wed Jan 05, 2022 12:05 pm

Hi, i bought a B156HW01 V.7 FHD panel. Installation works fine and brightness regulation in Win10 works too.

But i have some stupid image quallaty, in post screen black is not black but its light green see images.. what are the diverences between v0 1 2 3 4 5 and V7 displays? I found nothing

https://ibb.co/JCqJnRg
https://ibb.co/1fYSB2g
https://ibb.co/nLC9yD7

kfzhu1229
Senior ThinkPadder
Senior ThinkPadder
Posts: 2215
Joined: Tue Sep 22, 2015 10:59 pm
Location: Toronto, Canada

Re: L512 Dispay replace FHD problem

#2 Post by kfzhu1229 » Wed Jan 05, 2022 2:21 pm

If it works perfectly fine in Windows after you have the graphics drivers installed (and shows the same problem without the graphics drivers), this would be an EDID compatibility problem.
I had this on a Dell laptop before where I replaced with the WSXGA+ screen coming out of an MSI laptop, and the same problem occurs but it's perfectly fine in Windows with the graphics driver working properly.
Curiously enough, I tried the same screen on the same laptop but the integrated graphics version, the problem is not present.
I guess the solution would be to modify the EDID information of the panel, or swap the panels with another laptop. Maybe that other laptop won't have this compatibility issue with this panel.
Dell Lat CP MMX-233 64mb 40gb W2k
600 PII-266 416mb 40gb WXP
T23 PIII 1.13ghz 1gb W7
Precision M4300 X9000 8gb 160gb WUXGA Ultrasharp fp W10
T530i 15.6" i7 16gb fp W10
UXGA:
A30p PIII 1.2 1gb W7 (IDTech)
T43p 2.26 2gb fp W10 (Sharp)
Lat C840 P4-2.5 2gb 60gb W7 (Ultrasharp)

Gee1
Posts: 5
Joined: Wed Jan 05, 2022 11:58 am
Location: Chemnitz, DE

Re: L512 Dispay replace FHD problem

#3 Post by Gee1 » Wed Jan 05, 2022 2:30 pm

its not a grafics driver problem cause i have this problem in bios also

kfzhu1229
Senior ThinkPadder
Senior ThinkPadder
Posts: 2215
Joined: Tue Sep 22, 2015 10:59 pm
Location: Toronto, Canada

Re: L512 Dispay replace FHD problem

#4 Post by kfzhu1229 » Wed Jan 05, 2022 4:32 pm

Gee1 wrote:
Wed Jan 05, 2022 2:30 pm
its not a grafics driver problem cause i have this problem in bios also
As I said, EDID compatibility problem, and this is if under Windows after the graphics drivers are installed, the issue disappears.
Dell Lat CP MMX-233 64mb 40gb W2k
600 PII-266 416mb 40gb WXP
T23 PIII 1.13ghz 1gb W7
Precision M4300 X9000 8gb 160gb WUXGA Ultrasharp fp W10
T530i 15.6" i7 16gb fp W10
UXGA:
A30p PIII 1.2 1gb W7 (IDTech)
T43p 2.26 2gb fp W10 (Sharp)
Lat C840 P4-2.5 2gb 60gb W7 (Ultrasharp)

Gee1
Posts: 5
Joined: Wed Jan 05, 2022 11:58 am
Location: Chemnitz, DE

Re: L512 Dispay replace FHD problem

#5 Post by Gee1 » Wed Jan 05, 2022 4:52 pm

The drivers are installed i also flashed the new diwplay sucessfully with a lenovo cpompatible FHD Dispaly but nothing changed maybe i damaged the display cable. I will swap back to old display and see if the image gets good again

Gee1
Posts: 5
Joined: Wed Jan 05, 2022 11:58 am
Location: Chemnitz, DE

Re: L512 Dispay replace FHD problem

#6 Post by Gee1 » Wed Jan 05, 2022 5:14 pm

i figured out the display cable is ok.

Edit: I found out i have the wrong display cable for FHD i actually have the 45M2857 but in the forum i read i need 45M2859.. I ordered it an hope it works

Gee1
Posts: 5
Joined: Wed Jan 05, 2022 11:58 am
Location: Chemnitz, DE

Re: L512 Dispay replace FHD problem

#7 Post by Gee1 » Mon Jan 10, 2022 12:37 pm

UPDATE: I changed the Cable to "75Y5628" this should be the same like "45M2859". Can someone verify that?

I still have the same Problem. bad image quality and a light green touch instead of dark black in post screen

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