Toshiba T1900 Series: Difference between revisions

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|Leak Risk = High
|Leak Risk = High
|Batteries = 3 Batteries:
|Batteries = 3 Batteries:
Main battery: Nickel Metal Hydride 12 V 2,400mAH
Main battery: Nickel Metal Hydride 12 V 2,400mAH P/N PA2429U


Backup battery: AA sized Nickel Metal Hydride 1.2 V 1,100mAH
Backup battery: AA sized Nickel Metal Hydride 1.2 V 1,100mAH


RTC battery: 2032 rechargeable Lithium-Vanadium 3.0 V 50mAH
RTC battery: Rechargeable Lithium-Vanadium 3.0 V 50mAH
|Destructive Entry = No
|Destructive Entry = No
|CPU=80486 CPU, including the SX-20, SX-33, DX2-40 and DX2-50|Memory=4Mb, expandable up to 20Mb via optional Memory Card|Input Voltage=18V DC|Current=1.1 or 1.7A}}
|CPU=80486 CPU, including the SX-20, SX-33, DX2-40 and DX2-50|Memory=4Mb, expandable up to 20Mb via optional Memory Card|Input Voltage=18V DC|Current=1.1 or 1.7A|Power Connector=Barrel Jack, 5.5mm x 2.1mm, center positive.}}




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Almost all the screw are the same thread (m2.5), but vary in length. There are some M2 screws in the display assembly.
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).
The service manual has a complete guide on how to disassemble the laptop (see the link below), starts on page 4-1.




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|}
|}
<nowiki>*</nowiki> On the underside of the board
<nowiki>*</nowiki> On the underside of the board
Image Showing the locations of the Caps can be found [https://www.vogons.org/download/file.php?id=185556&mode=view here on Vogons]


==Replacement Parts==
==Replacement Parts==
===Lower PCB Top Side===
===Batteries===
{| class="wikitable sortable"
{| class="wikitable sortable"
|+Capacitors
|+Capacitors
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! Order Links
! Order Links
|-
|-
|
|RTC Battery
|
|1
|
|Mouser P/N: 658-VL-2330/F3N
|[https://www.digikey.com/ Digikey]
|[https://www.mouser.com/ProductDetail/Panasonic-Battery/VL-2330-F3N?qs=1eQvB6Dk1viFk5MJfXlXVQ%3D%3D Mouser]
|-
|-
|
|Backup Battery
|
|1
|
|Mouser P/N: 547-NH1250AA
|
|[https://www.mouser.com/ProductDetail/Power-Sonic/NH1250AA?qs=rpv7i0cjkZn%252BjV7mJ%2F85bg%3D%3D Mouser]
|-
|-
|
|A/C Power Adapter
|
|1
|
|Mouser P/N: 680-IPD3018-760
|
|[https://www.mouser.com/ProductDetail/Inventus-Power/IPD3018-760?qs=sGAEpiMZZMs2%252BVrH5rwl1tZrIV6m1YghVQa%2Fy54t%2FKZLMYEADG%2F4Ow%3D%3D Mouser]
|}
|}
''If parts are not available or different selection is preferred, you can use the values in the [[#Original_Parts|Original Parts]] section to perform a parametric search.''
''If parts are not available or different selection is preferred, you can use the values in the [[#Original_Parts|Original Parts]] section to perform a parametric search.''

Latest revision as of 04:47, 30 November 2024

For more information, see this article's corresponding Wikipedia page: Toshiba_T_series.
Quick Specs
Preliminary Information
Release Year 1993/1994
Leak Risk High
Batteries 3 Batteries:

Main battery: Nickel Metal Hydride 12 V 2,400mAH P/N PA2429U

Backup battery: AA sized Nickel Metal Hydride 1.2 V 1,100mAH

RTC battery: Rechargeable Lithium-Vanadium 3.0 V 50mAH
Destructive Entry No
Hardware Specifications
CPU 80486 CPU, including the SX-20, SX-33, DX2-40 and DX2-50
Memory Capacity 4Mb, expandable up to 20Mb via optional Memory Card
Power Requirements
Input Voltage 18V DC
Current (Amps) 1.1 or 1.7A
Power Connector Barrel Jack, 5.5mm x 2.1mm, center positive.


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), starts on page 4-1.


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 Mount Diameter/Size Height Lead Spacing Temp Type Brand Series
C504 1 470 µF 25 Through Hole 10mm? 105 °C Electrolytic
C509 1 2200 µF 6.3 Through Hole 12.75mm 20mm 105°C Electrolytic
C518, C520 2 56 µF 16 Through Hole 6.5mm 7.5mm 105°C Electrolytic
C516, C521 2 120 µF 16 Through Hole 6.5mm 11.5mm 105°C Electrolytic
C511 1 1000 µF 6.3 Through Hole 10.5mm 10mm 105°C Electrolytic
C507, C513, C515 3 220 µF 10 Through Hole 6.5mm 10mm? 85°C Electrolytic
C526, C527, C528, C523* 4 10 µF 6.3 SMD
C208* 1 33 µF 6.3 SMD

* On the underside of the board

Image Showing the locations of the Caps can be found here on Vogons


Replacement Parts

Batteries

Capacitors
RefDes Qty Compatible Part Number Order Links
RTC Battery 1 Mouser P/N: 658-VL-2330/F3N Mouser
Backup Battery 1 Mouser P/N: 547-NH1250AA Mouser
A/C Power Adapter 1 Mouser P/N: 680-IPD3018-760 Mouser

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

Vogons forum post about the issues with the power board

T1900 Maintenance Manual at minuszerodegrees.net

References

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