Toshiba Satellite T1900/T1900C

The Toshiba T1900 and T1900C are a pair of 486-based laptops that were released in 1993.

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Specifications

Spec	T1900	T1900C
CPU	CPU Type: Soldered QFP Intel 486SX @20MHz
Chipset	Toshiba Gate Array
RAM	Type: Proprietary Standard: 4MB Maximum: 20MB
Hard Disk	2.5" IDE Uses proprietary adapter?: Unknown Standard: 120MB	2.5" IDE Uses proprietary adapter?: Unknown Standard: 120 or 200MB
Display Options	9.5" Passive Matrix Grayscale LCD @640x480	9.5" Passive Matrix Color LCD @640x480
Graphics Chipset	Unknown VRAM: 256KB
Audio	PC Speaker
Main Battery	NiMH (12V, 2400mAH)
CMOS Battery	- Lithium CMOS Battery - NiMH Backup/Reserve Battery
Power Supply	Barrel Jack
Disk Drives	3.5" 1.44MB Floppy Drive
PC Cards	1x PCMCIA Slot
Networking	None
Other I/O	- 1x Parallel - 1x Serial - 1x VGA Out - 2x PS/2 - 1x QuickPort for external trackball
BIOS	Toshiba BIOS
Pointing Device	None

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Resources

Service Manual	Brochure

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Common Faults & Maintenance

The build quality on these laptops is good and seeing one with a busted hinge is rare.

Hibernation Battery Leaks

The T1900 and T1900C have an internal NiMH reserve battery that is prone to leaking and should be removed. I believe it is located in the front middle of the system.

Capacitor Failure

The T1900 and T1900C must have their DC/DC board and motherboards recapped in order to work reliably. Many online sources advise you to only replace one 1000uf capacitor (that has been prone to failing since as early as the mid 2000s...), but at this point, they're all going bad and leaking. Take care to also replace the "imposter tantalum" caps - that is, plastic-cased low profile caps that are actually electrolytics - as well. The LCD and inverter board may also need recapping.

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Page last updated (MM/DD/YYYY): 11/11/2024
Update Reason: page created

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