Kobo libra 2 VCOM

[nftstra]

I replaced my broken libra 2 screen with a new one, but it have a different vcom value, does anyone know how i can change the VCOM of my libra 2, the ifixit method doesnt seem to work for the libra 2 ?

Thank you!

[JSWolf]

This is from Google AI. It may or may not work. But it's not a problem if it doesn't work.

Step 1: Find the Target Screen Voltage

Every E-ink display is uniquely calibrated at the factory. The required voltage is written directly on the screen hardware.

• Open the device to view the mainboard and the display panel ribbon cable.
• Locate the printed sticker or a QR code on the E-ink display's flexible ribbon cable.
• Note the 3-digit decimal number (e.g., -2.81 or -1.23).
• Multiply this number by 1000 to get your VCOM value. For example, -2.81 becomes -2810.

Step 3: Calibrate the Value

If the recorded value doesn't match the hardware number from Step 1, apply the override:

• Open the Kobo eReader.conf file via a computer text editor (Notepad++ on Windows)
• Add your calculated value exactly as follows under the developer header:

ini

[DeveloperSettings]
VCOM=-2810

Save the file, eject your Kobo safely, and restart the device.

[PeterT]

@JSWolf I believe this info came fro m the ifixit web site and applies to the Kobo Libra Colour, Clara Colour, and Clara BW (both N365 and P365) models.

https://www.ifixit.com/Guide/How+to+...Display/170983

[JSWolf]

Originally Posted by PeterT

@JSWolf I believe this info came fro m the ifixit web site and applies to the Kobo Libra Colour, Clara Colour, and Clara BW (both N365 and P365) models.

https://www.ifixit.com/Guide/How+to+...Display/170983

The instructions on itifix say to use a vcom file to update. I'd try the kobo ereader.conf file. I can't hurt to try.

[nftstra]

Originally Posted by JSWolf

This is from Google AI. It may or may not work. But it's not a problem if it doesn't work.

Step 1: Find the Target Screen Voltage

Every E-ink display is uniquely calibrated at the factory. The required voltage is written directly on the screen hardware.

• Open the device to view the mainboard and the display panel ribbon cable.
• Locate the printed sticker or a QR code on the E-ink display's flexible ribbon cable.
• Note the 3-digit decimal number (e.g., -2.81 or -1.23).
• Multiply this number by 1000 to get your VCOM value. For example, -2.81 becomes -2810.

Step 3: Calibrate the Value

If the recorded value doesn't match the hardware number from Step 1, apply the override:

• Open the Kobo eReader.conf file via a computer text editor (Notepad++ on Windows)
• Add your calculated value exactly as follows under the developer header:

ini

[DeveloperSettings]
VCOM=-2810

Save the file, eject your Kobo safely, and restart the device.

thank you

I tried this as well but it didnt solve the problem the device keep running on the original vcom which is in my case off by a lot so its hurting the screen, the last thing gpt suggest is to change the hex files on the sd card

so im going to look how i can carefully remove the sd card and clone it on a new one and see what happens

[JSWolf]

Originally Posted by nftstra

thank you

I tried this as well but it didnt solve the problem the device keep running on the original vcom which is in my case off by a lot so its hurting the screen, the last thing gpt suggest is to change the hex files on the sd card

so im going to look how i can carefully remove the sd card and clone it on a new one and see what happens

Good luck. If you do manage to do this, please let us know what it is you did. Thanks.