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While trying to replace the battery, I must have damaged certain connection to the discrete gpu. Whenever trying to use discrete gpu, the computer would freeze.

After trying to reset VRAM, it basically won't boot anymore. (There's a 5% chance of booting by juggling around reset VRAM and unplugging boards.)

I would love to fix it if possible, probably by permanently disabling the discrete gpu in some way, but not giving too much hope.

Rather I will probably just reuse my screen as external display.


So, do anyone know what's the lcd model number for it so I can get a controller board for it?

Thank you!

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  • I'd at least reset the SMC, as you've changed hardware, & check if you jogged a connection before giving up entirely. Blowing the NVRAM almost never fixes anything, but after any hardware change, resetting the SMC is always a valid option. support.apple.com/HT201295
    – Tetsujin
    Commented Aug 31, 2020 at 7:33
  • @Tetsujin resetting SMC pretty much make it worse everytime. It just make it go to the "Your computer restarted because of a problem..." screen, and won't get out without couple more hours of juggling.
    – Ranoiaetep
    Commented Aug 31, 2020 at 9:17

2 Answers 2

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Unfortunately, you cannot get the LCD panel model number from the command line as it's not stored in firmware as part of the monitor's EDID.

For example, I had to replace the the LCD of my 27" iMac due to an unfortunate incident involving a disobedient child and a fidget spinner. The model number for the panel was "LM270WQ1" where as the Apple PN# was "661-7169." Those numbers aren't present in any of the EDID data. See below

Using the system_profiler command:

$ system_profiler SPDisplaysDataType 
Displays:
    iMac:
      Display Type: LCD
      Resolution: 2560 x 1440 (QHD/WQHD - Wide Quad High Definition)
      UI Looks like: 2560 x 1440
      Framebuffer Depth: 24-Bit Color (ARGB8888)
      Main Display: Yes
      Mirror: Off
      Online: Yes
      Automatically Adjust Brightness: No
      Connection Type: Internal
    DELL U2312HM:
      Resolution: 1080 x 1920
      UI Looks like: 1080 x 1920 @ 60 Hz
      Framebuffer Depth: 24-Bit Color (ARGB8888)
      Display Serial Number: T9MJ318O630L
      Mirror: Off
      Online: Yes
      Rotation: 90
      Automatically Adjust Brightness: No
      Connection Type: Thunderbolt/DisplayPort

Using the ioreg command to get EDID

$ ioreg -lw0 -r -c "IODisplayConnect" -n "display0" -d 2 | grep IODisplayEDID | sed "/[^<]*</s///" | xxd -p -r | strings -6

s@L036"
q8-@X,E
T9MJ318O630L
DELL U2312HM

Neither have the actual panel info model because that's typically not put in by the display manufacturer. For this, you need to (unfortunately) disassemble the display and get the LCD panel model off the back. I recently replaced the LCD in a Mid-2007 MacBook (white) and it was imperative that I replace it with a compatible panel. I was inadvertently sent a panel for a later MacBook (2008) and while it physically fit and the LVDS connectors were compatible, the panel simply didn't work.

enter image description here

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You can get the panel model number from the command line:

ioreg -lw0 | grep IODisplayEDID | sed "/[^<]*</s///" | xxd -p -r | strings -6

For me it's the third line:

$ ioreg -lw0 | grep IODisplayEDID | sed "/[^<]*</s///" | xxd -p -r | strings -6
������
Color LCD
LP133WQ6-SJA4

More info at OSXDaily - Find Out Type and Model of LCD Panel in an iMac, MacBook, MacBook Pro, etc

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  • But I can’t get to command line without booting it up, or can I?
    – Ranoiaetep
    Commented Aug 31, 2020 at 7:20
  • Have you looked at apple.stackexchange.com/questions/166876/… ?
    – Volsk
    Commented Aug 31, 2020 at 7:34
  • I just tried that, and the other link you commented earlier. Couldn't get it to work tho. I was able to get into safe mode after changing nvram, but after deleting kext files, it won't work anymore.
    – Ranoiaetep
    Commented Aug 31, 2020 at 9:20
  • And using the command line in safe mode only output: ?????? and Color LCD without the model number
    – Ranoiaetep
    Commented Aug 31, 2020 at 9:21
  • That gives you Apple's info for the whole assembly, not the panel. And that info is not guaranteed to be there. EDID data is haphazard at best.
    – Allan
    Commented Aug 31, 2020 at 18:11

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