@2disbetter thanks for the bump! I had to put the project aside for a bit after the initial post, but as of about two weeks ago I’ve been back at it.
I finally got a 3D printer that can run the entire bottom case in a single print, so I’ve been working on refining the mechanical design. It’s about 95% there.
The other big progress is on the other PCBA that will live next to the USB hub. This other board is like the rug that ties the room together. It handles the keyboard, trackpoint, wifi/bt, lid closure sensor, indicator LEDs, power button, and some other housekeeping items.
I don’t have anything to show photos of just yet, but I should have a real update soon.
Internal view. A stock Framework battery sits on the elevated foreground section. The black blob on top of the mainboard is a 3D printed representation of the integration board I mentioned in the last post. If you look closely you can also see a small green PCBA in the M.2 slot. This is a (pretty hacky) “u-turn” board I designed that breaks out all the M.2 pins to a FFC ribbon and relocates them to the integration board. I did test this using some breakout boards a while back and, while highly abusive of the USB and PCIE routing standards, does appear to work just fine.
The two right-side USB-C ports are exposed directly off the mainboard. The three holes on the left of this image are for the power button. That internal assembly also doubles as the retainer for the M.2 “u-turn” board.
These are cutouts for a gigabit ethernet port and two USB-A ports that come off the custom hub I’m working on. I’ve put the USB hub board on the backburner while I get the laptop itself to a functional state, so they’re empty right now.
The integration board, along with a custom flex cable for the input cover connector, and a small board to hold the 701C indicator LEDs are all on order and should be arriving next week. Assuming I don’t hit any major roadblocks, I should have a largely working laptop in the next two weeks. At that point I’ll pivot to working on the USB hub and get the case shell printed on an MJF machine.
It’s also worth noting that most of the stock Thinkpad parts are either cracked, broken, or at least cosmetically challenged. These laptops are notorious for having brittle plastic and mine is no different. I’ll try to make it nice once I get it all put together and working, but for now I’m not too concerned about it.
@Karl_Buchka If I understand correctly, this microcontroller board should be connected to the mainboard through the usb-c port. The information of leds comes from windows api? in this case, are the leds of battery power and power not work when the device is turned off?
The board is connected via USB, but since the same microcontroller that’s processing keystrokes is driving the LEDs, it does the keyboard indicators just fine.
The power LED and hard drive LEDs are easier since they only need to be on when the laptop is powered up.
The charging LED is the main issue. Unless I tap into the physical LED on the mainboard (which I don’t really want to do), it won’t work unless the laptop is powered on and I have a driver of some kind communicate that status to the micro. All in all I think it’s a small price to pay. I could also add a small light pipe to the side of the chassis so the factory LED is visible through the side of the case.
The integration board, top cover flex jumper, power switch board, and LED carriers came in today. Assembling them tomorrow and hopefully I’ll have a fully functioning Framework/Thinkpad hybrid.
@rednight39 I just saw it. Wow! That’s very flattering. Thank you, Nirav!
Here’s the latest progress shot on the board bring-up. So far I’ve just done basic power-on testing, but it’s looking promising. I haven’t let the smoke out of anything yet. You can see the flex cable connecting the integration board to the Framework mainboard. The small flex cable is for the power button.
I’ve got some more progress to report. I printed a new version of the bottom case with a routing channel for the eDP cable and a little cover to hold it in place. You can also see a small guide that lives in the screen assembly for the same purpose. I’ll likely wrap the cable in some chafe-protecting tape before I final assemble everything.
The keyboard and trackpoint are now fully functional as well. I’m using the power and USB lines that are present on the mainboard’s input cover connector. That’s the flex jumper you see on the bottom right. The keyboard row/col lines are connected directly to the Teensy 3.6 microcontroller. The trackpoint strain elements are run through a Sprintek 8707 trackpoint to PS/2 board, which then runs to the Teensy.
In the video you can also see the new top cover I designed to replace the original part. Mine was in about 5 pieces and couldn’t really be salvaged. This new piece should also be compatible with completely unmodified 701Cs, so it might be useful to people restoring those machines.
The Caps Lock, Num Lock, and Scroll Lock indicators are working as well.
Main open work on the integration board:
Test the lid sensor and audio board passthrough. (Missing a sufficiently long FFC cable at the moment)
Test the wifi/bluetooth. (Have all the parts, just haven’t done it yet)
Fix the power button PCB. (I goofed up the tactile button pinout)
Fix some function key related bugs in the QMK firmware build. (Some Fn key combos put the key overlays in a wonky state)
Thank you very much for the detailed updates on this. I think the red printed part look super classy on this. In the video where you are showing the keyboard in action as it slides out I saw just how compact the 701C really was. Such a marvelous notebook. This is the perfect size to me. Just small enough to be ultra portable but big enough with the awesome keyboard to be totally usable.
I would love to see a video of the Framebook 701C when and if you have the time for something like that. What a way to continue the amazing engineering in the original and using it today to great effect.
I don’t think I would ever tire of getting updates on this.
@2disbetter thank you! The footprint really is quite small for what it is, but the thickness is how it still shows its age. A Framework 13 is a fair bit larger, but the significantly lower profile ultimately makes it easier to tote around and use.
The red is just the random PLA I happen to have in the printer right now. I definitely want the “finished product” to be black.
Current status: After the last progress push I hit minor burnout on the project, so I’ve put it aside. This isn’t atypical for me. I work on things in spurts. I’ll get back to it in a few weeks. This is a pre-emptive apology for the upcoming lack of updates.
Super cool! Thanks for the update again! I’ve been gone from the forums for a while, so I wasn’t seeing any updates. This is still such a cool way to upcycle a legendary older thinkpad.
Hah, no stress at all. I actually just received another broken 701C in the mail that I managed to find for a fair price. This one will donate some of its parts to my build. I think now that I have all the spares I need I’ll get back to the project. Hopefully I’ll have some fresh updates next week!
