Toshiba T4600 and T6400C
The Toshiba T4600 and T4600C are 486-based laptops that were released in May 1993.
Specifications
| Spec | T4600 | T4600C |
|---|---|---|
| Release Date | May 1993 | |
| CPU | CPU Type: Soldered TCP Intel 486SL @33MHz | |
| Chipset | Unknown | |
| RAM | Type: Unknown Standard: 4MB Maximum: 20MB | |
| Storage | 2.5" IDE Requires Adapter: Unknown Standard: 120, 200, or 320MB | |
| Display Options | Passive Matrix Grayscale @640x480 | 9.5" Active Matrix Color @640x480 |
| Graphics Chipset | Western Digital WD90C26 VRAM: 512KB | |
| Audio | PC Speaker | |
| Main Battery | NiMH | |
| CMOS Battery | - Lithium CMOS Battery - NiMH Reserve Battery | |
| Power Supply | Unknown | |
| Media Drives | 3.5" 1.44MB Floppy Drive | |
| PC Cards | 2x PCMCIA Slots | |
| Networking | None | |
| Other I/O | - 1x Parallel - 1x Serial - 1x VGA Out - 2x PS/2 - 1x Dock Connector - 1x QuickPort for external trackball | |
| BIOS | Toshiba | |
| Pointing Device | None | |
Resources
 Service Manual |
|---|
Common Faults & Maintenance
Hibernation Battery Leaks
The T4600 and T4600C have an internal NiMH hibernation battery. These batteries are highly prone to leaking, and should be removed on any one of these laptops. It is located above the secondary LCD display, next to the right hinge.
Capacitor Failure
The T4600 machines are full of leaky capacitors, and any of them will need to be recapped in order to function reliably. Most non-recapped ones no longer power on. The DC/DC board, motherboard, and I believe also the LCD on the T4600C are what you'll need to recap. The DC/DC board in particular is the worst offender, given that it uses ELNA LongLife series capacitors, which are just awful, but all three parts are a must-do.
Floppy Drive Failure
None of the unserviced floppy drives for these work anymore because they use a belt that degrades with age. I believe they use a Matsushita/Panasonic drive, and there is not currently a known source for the belt. The drive is very picky about belts and one that sort of fits but not well will not usually work. For this reason, you're better off replacing the original drive with a Teac instead. These have a slightly different pinout, but it's possible to adapt them to work.
Page last updated (MM/DD/YYYY): 03/10/2025
Update Reason: page converted to php
Back-Navigation
Home < Laptop Portal < Toshiba < T4600/T4600C