W520 B156HW01 screen upgrade gone wrong

[lordsnipe]

Hi all,

I am trying to fit a B156HW01 V0 screen into my W520 which had a 1600x900 screen and am having display issues. Apologies for the blurry phone pics. Hopefully these images work.





As can be seen, the BIOS screen is blue, and the screen is split into two. This is evident in Windows 10 as the Recycle Bin is displayed twice.

Does anyone know what's going on here? I've reseated the monitor connector a number of times now and nothing changes. Reverting to the 1600x900 screen works fine. In Windows 10, the monitor is limited to 1024x768 (and is detected as such). If I try and change it to a PNP monitor, I still can't select a 1080p resolution.

I am hoping this is not a dud screen as it's my second one (and supposedly brand new). The first one I bought (a v3 model) only displayed a white screen on power up, so I thought it was a dud.

EDIT: It appears to be only an issue if the display in the BIOS is set to the integrated graphics or Optimus mode. Discrete mode will not have the blue tinge? Is it somehow an issue with the Intel HD3000 graphics only?

[RealBlackStuff]

Get the datasheets from your V0 and compare its 40-pinout with the V4 as used in T/W510 and T/W520.
You may have bought the wrong version.

[lordsnipe]

RBS, thanks for your reply. The screen is now working in 1080p without issue when discrete graphics is set in the BIOS, not optimus or integrated. If it were a pinout issue, then surely discrete only wouldn't work?

[ajkula66]

My understanding is that Intel graphics found in Sandy Bridge chipsets are not officially supported by W10. While I have no way of proving it, my hunch would be that the problem lies somewhere along that corridor.

Good luck.

[kfzhu1229]

I'm pretty sure that is not the case as a X220 installs all the drivers by itself in Windows 10 as soon as I connected to the wifi. Thats also sandy bridge.

[ajkula66]

I'm pretty sure that is not the case as a X220 installs all the drivers by itself in Windows 10 as soon as I connected to the wifi. Thats also sandy bridge.

You're missing my point.

OP's system works fine with discrete graphics, but Intel/Optimus settings are causing trouble.

Your X220 only has integrated graphics and is capable of one screen resolution only. There's no comparison between the two.

[kfzhu1229]

Ohhh. Sorry. My friend has T520 with HD+ as well. I have just done a clean Windows 10 x64 install on his new SSD 2 months ago and no problems encountered either. Same NVS 4200M and Intel HD 3k

[lordsnipe]

I don't think it's solely a W10 issue as the BIOS screens are also affected when the graphics adapter is set to Integrated or Optimus.

And with the original 1600x900 display, integrated graphics worked with no issue on the BIOS and Windows.

[FryPpy]

Just curious what Linux (Ubuntu) say about your LCD in integrated (Intel video) mode. If you can try Ubuntu in LiveCD mode.

[ajkula66]

I don't think it's solely a W10 issue as the BIOS screens are also affected when the graphics adapter is set to Integrated or Optimus.

Pull out the HDD/SSD out and start the machine then proceed to BIOS in all three modes, with a full shutdown once you've gotten there. Report back.

[jcvjcvjcvjcv]

Just because W10 installs drivers for something... doesn't mean it works. For the Intel AGN 4965 in the T61 it installs drivers from 2010... that BSOD the system. Vista drivers from 2007 work fine... but require manual install.

Having said that, my W520 works fine with W10 on Intel graphics. Although I have a feeling it's "stuck" on the nV card too often.

[lordsnipe]

Removing the SSD does not change anything, graphics are still the same when using integrated graphics.

Using an Ubuntu disk and looking through the Xorg.log, it does mention Intel HD Graphics in it.

I am thinking it may be an EDID issue as I was using Entech MonInfo (http://www.entechtaiwan.com/util/moninfo.shtm) and no realtime EDID information was showing up.

I found a datasheet for the B156HW01 v0 online that has what the EDID should be, so I'm planning to dump the EDID and compare it to the datasheet.

[ajkula66]

I found a datasheet for the B156HW01 v0 online that has what the EDID should be, so I'm planning to dump the EDID and compare it to the datasheet.

Well if you're planning to take that route I'd suggest locating the EDID for V4 and dumping that instead...

Good luck.

[lordsnipe]

I have seen a V4 datasheet too so could also use that as a comparison

[lordsnipe]

Fixed! The EDID was corrupt!

I used the instructions found at http://hubpages.com/technology/how-to-r ... upted-edid and used Ubuntu to dump the EDID out of the monitor and compared it to the datasheet that I found online. There were a number of bytes which weren't right. Corrected them, flashed the EDID IAW the datasheet and success!

I've set the BIOS back to Optimus mode so discrete graphics can be used on demand.

[RealBlackStuff]

I don't want to appear a know-all, but your V0 EDID itself might have been correct, but different when compared with V4 EDID.
Maybe the V0/V1/etc. variety only points to a screen with a different EDID Version?
If it's "just" a different EDID, there might be an interesting price-difference between Vx versions, depending on which brand/model they were destined for...
E.g. a Dell screen that can also be used in a Lenovo, costs (on average) a lot less than the equivalent Lenovo screen.

[lordsnipe]

I used a v0 EDID and not a v4 version and it wasn't correct, cos the original checksum was wrong according to edid-decode.