Toshiba T1900 Series

Preliminary Information
Leak Risk	High
Batteries	3 Batteries: Main battery: Nickel Metal Hydride 12 V 2,400mAH Backup battery: AA sized Nickel Metal Hydride 1.2 V 1,100mAH RTC battery: 2032 rechargeable Lithium-Vanadium 3.0 V 50mAH
Destructive Entry	No

For more information, see this article's corresponding Wikipedia page: Device.

Known Issues

Laptop won't power on

The Toshiba T1950 Laptop is known not to power on due to bad caps on the power board, the lower of the two boards in the laptop. When the on button is pressed, it lights up, but immediately turns off.

Causes

Bad or leaky caps

Solutions

Replace the Caps and clean the board

Disassembly Notes

Almost all the screw are the same thread (m2.5), but vary in length. There are some M2 screws in the display assembly.

The service manual has a complete guide on how to disassemble the laptop (see the link below).

Original Parts

Lower PCB

C526, C527, C528 are surface mount caps, can be replaced with MLCC caps.
C523 and C208 are on the underside of the PCB
C523 and C208 are surface mount and can be replaced with MLCC caps
See the service manual for locations, or the Vogons post about this (both linked below)

Capacitor Specifications and Footprint Information
RefDes	Qty	Capacitance	Voltage	Diameter/Size	Height	Temp
C504	1	470 µF	25			105 °C
C509	1	2200 µF	6.3	12.75mm	10mm	105
C507	1	220 µF	10			85
C518	1	56 µF	16	6.5mm	7.5mm	105
C516	1	120 µF	16	6.5mm	11.5mm	105
C511	1	1000 µF	6.3	10.5mm	10mm	105
C513	1	220 µF	10			85
C515	1	220 µF	10			85
C521	1	120 µF	16	6.5mm	11.5mm	105C
C520	1	56 µF	16	6.5mm	7.5mm	105
C526 C527 C528	3	10 µF	6.3
C523*	1	10 µF	6.3
C208*	1	33 µF	6.3

* On the underside of the board

Replacement Parts

Lower PCB Top Side

Capacitors
RefDes	Qty	Compatible Part Number	Order Links
			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.

References