Macintosh PowerBook 100

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For more information, see this article's corresponding Wikipedia page: PowerBook 100.
This device is in the WorkNeeded:OriginalParts category because it was flagged as missing information on the original parts. It may have replacement parts listed but those cannot be assumed to be identical to the originals. If you have a list of the original parts, please feel free to add them by copying the relevant table from EditorsToolbox:Tables
This device is in the WorkNeeded:ReplacementParts category because it was flagged as missing information on replacement parts. If it has the original parts listed you may be able to search for replacements using the parametric searches available from parts distributors. If you have or make a list of replacement parts, please feel free to add them by copying the relevant table from EditorsToolbox:Tables
This device is in the WorkNeeded:General category because it was flagged as missing general information about the device. The information may be incomplete, using default text, or inaccurate and should be verified with external sources if possible. If you can add or correct information on this page, please feel free to edit it and do so.
Apple Macintosh PowerBook 100
Preliminary Information
Release Year 1991
Leak Risk High
Batteries Main is a removable Lead-Acid pack, PRAM batteries are 3 CR2430 Lithium Coin Cells
Mounting Technology Through Hole, SMD, Sockets
Capacitor Types Aluminum Electrolytic, Tantalum, Ceramic, Polymer
Destructive Entry No
Hardware Specifications
CPU 68000 @ 16 MHz
Memory Capacity 2MB to 8MB
Memory Type On-board Pseudo-SRAM, Proprietary Expansion Slot for up to 6MB additional Pseudo-SRAM
Storage 20 or 40MB 2.5" SCSI Hard Drive, HDI-20 Floppy Port, HDI-30 SCSI Port
Graphics 9" 640x400 1-Bit Monochrome FSTN LCD
Display Interface Proprietary LCD Cable, No External Video Port
Sound 8-bit Mono @ 22 kHz
Power Requirements
Input Voltage 7.5V DC
Current (Amps) 2A
Power Connector Center Positive

The Apple Macintosh PowerBook 100 is a portablized version of the Apple Macintosh Portable, designed by Sony, as Apple was busy designing the all original PowerBook 140 and 170 models. This listing is currently incomplete, as I'm in the process of recapping mine, but as I get more data I'll fill in more.

Known Issues

No display/Poor contrast response


  • Bad capacitors in the LCD panel
  • Damaged contrast potentiometer


  • Replace capacitors C1 through C8 (3.3uF 35V) on the LCD
  • Clean or replace VR402 on the board under the LCD

Pink splotch in screen


  • Rubber degradation on screen border bumpers, causing the top panel to hit the trackball when the lid is shut
  • Hard impact to the display


  • Remove the trackball when storing the laptop for a long period of time
  • Leave the lid open and the laptop on display when not using the laptop
  • In concept you could replace the rubber bumpers and avoid these solutions, but there's no template yet for a mold


  • Replacing the LCD panel is the only true fix, otherwise you have to work around the damage when using the laptop

Does not boot from 20 or 40 MB Conner hard drive after recap


  • Bad original SCSI hard drive


  • Replace original SCSI drive with new-old stock or modern solid-state replacement (i.e. BlueSCSI, RaSCSI, SCSI2SD)

Disassembly Notes

The laptop uses 3 phillips head screws on the bottom of the laptop to hold the display assembly in. Once they are removed, the whole laptop (excluding the display panel itself) becomes tool-less for the purposes of replacing capacitors. Every part is either socketed or clipped in with metal tabs. Once the keyboard is slid out of the machine, the palm rest slides up by grabbing the part nearest the back of the laptop, gently pulling up, and sliding it back. The display itself uses phillips head screws hiding under some covers on the bottom of the screen hinge assembly.

Original Parts

Sharp LM64P791 T-Con Board

This board lacks an official part number, as it is technically part of the LCD itself.

Capacitor Specifications and Footprint Information
RefDes Qty Capacitance Voltage Mount Diameter/Size Height Lead Spacing Temp Type Brand Series
C1, C2, C3, C4, C5, C6, C7, C8 8 3.3 µF 35V DC SMD 0 °C Electrolytic Unbranded

Replacement Parts

Sharp LM64P791 T-Con Board

RefDes Qty Compatible Part Number Order Links
C1, C2, C3, C4, C5, C6, C7, C8 8 ? Digikey

If parts are not available or different selection is preferred, you can use the values in the Original Parts section to perform a parametric search.


Related Links