This nice T3100 is so heavy and always needs a power cord. But it's working after all these years! Maybe I have to try to repair the screen.
You basically have to replace the display. I've got one from a Compaq Portable III that only has two bad lines on it, if you need it. (AFAIK they're the exact same displays.)
Here's my fully restored, pimped out Portable III hooked up to a GPIB debugger:
While the original 20MB Seagate hard drive still worked, I decided to replace it with solid state storage. The Portable III was the first machine to ship with an IDE interface, so I was able to replace it a CF card. Unfortunately the BIOS didn't allow custom drive types, so I ended up having to flash an EEPROM with the XTIDE BIOS, which I installed in the ROM slot of an EtherLink III card. Now I can boot from the CF card via the built-in IDE connection!
I also added an i287XL Math Coprocessor (which is really just an i387) and replaced the UART with something a bit faster.
Finally, the motherboard originally had a square Keeper II battery plugged in which fed power to a separate Motorola RTC/NVRAM chip. Unfortunately those batteries can no longer be found. I originally tried replacing it with a LiR2230 battery in a coin cell holder, with a resistor to limit charge current, however it didn't work well. I ended up just pulling the RTC chip and replacing it with a brand new Maxim BBRTC/SRAM chip that is functionally and electrically equivalent to the original Motorola chip, that way a separate battery is no longer needed. It seems to work perfectly! (Thanks to Maxim for sending me free samples!)
Such a great little machine!