Need Help Adapting Chromebook Touch Display to External Display (discuss.online)

submitted 3 weeks ago by umean2me@discuss.online to c/techsupport@lemmy.world

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I took this Chromebook touch display off of a broken Chromebook.

It’s a SHARP LQ123P1JX33/A01 .

I’ve determined that I would need an eDP 40-pin to mini-DisplayPort adapter for output to the LCD screen, but I’m having trouble finding information for what I would need (if I need anything) for this connection? I assume this is the part of the display that handles the touchscreen. Is it possible to adapt this for external use, or is it not worth the hassle?

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[-] the_riviera_kid@lemmy.world 4 points 3 weeks ago

If you are doing it because you want to then it is worth the effort. If you are doing it in a misguided attempt to save money it might not be.

No mater what its probably going to be a bit janky but thats half the fun.

[-] Thorry84@feddit.nl 2 points 3 weeks ago* (last edited 3 weeks ago)

Adding a comment in the main thread so OP gets a notification.

Looking at the picture, I think the testpoints with labels next to the connector are directly connected to the connector? If OP can confirm that?

In that case it's a I2C conection, with some extra pins. You can connect that to USB using something like a GT911 converter, found for cheap on sites like Aliexpress and Ebay. However converting the connector can be a pain in the ass, so I would just solder a ribbon cable to the test points and do the same on the side of the converter.

When choosing a converter be sure it's 3.3V and not 5V. So maybe add a level shifter, or choose a converter with a level shifter. The touch screen might be 5V tolerant, but it's a risk to try it.

[-] umean2me@discuss.online 2 points 3 weeks ago

Yes the test points are directly connected. This seems like the answer I was looking for, so I’ll shop around and try and get that to work. Thank you so much!

[-] jqubed@lemmy.world 1 points 3 weeks ago

I think sometimes it’s USB, but that looks like too many pins for USB

[-] Thorry84@feddit.nl 2 points 3 weeks ago* (last edited 3 weeks ago)

Could still be USB, those little traces can't handle a lot of power so it's good practice to double up on power and ground lines.

It can also be this connector also handles stuff like brightness and contrast controls, so the extra lines could be for that.

Figuring this out without also having the motherboard this connects to would be tricky. Unless the datasheet can be found, but I couldn't find it.

Edit: Looking at the picture, I think the testpoints with labels next to the connector are directly connected to the connector?

In that case it's a I2C connection, with some extra pins. You can connect that to USB using something like a GT911 converter, found for cheap on sites like Aliexpress and Ebay. However converting the connector can be a pain in the ass, so I would just solder a ribbon cable to the test points and do the same on the side of the converter.

When choosing a connector be sure it's 3.3V and not 5V.

this post was submitted on 22 Apr 2025

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