NEC VERSA 2760MT: Difference between revisions

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|Picture = Nec_versa_2760mt.jpg
|Picture = Nec_versa_2760mt.jpg
|Release Year = 1997
|Release Year = 1997
|Mounting Technology = Through Hole, SMD, QFP, BGA, ZIFs Sockets, FFCs, High Density Interconnects  
|Mounting Technology = Through Hole, SMD, QFP, BGA, ZIF Sockets, FFCs, High Density Interconnects  
|Capacitor Types = Aluminum Electrolytic, Tantalum, Ceramic, Polymer
|Capacitor Types = Aluminum Electrolytic, Tantalum, Ceramic, Polymer
|Leak Risk = High
|Leak Risk = High
|Batteries = Yes, CMOS NiMH Rechargeable
|Batteries = Yes, NiMH for CMOS + RTC and Li-Ion for main battery
|Destructive Entry = Yes, brittle plastics  
|Destructive Entry = Yes, brittle plastics, sealed external PSU brick
}}
|CPU=Intel Pentium MMX @ 166 MHz|Memory=16 or 32 MB (upgradeable to 128 MB)|Memory Type=EDO DRAM (socketed)|Storage=1x 2.5in 2.1 GB IDE HDD (up to 4 GB)|Graphics=NeoMagic MagicGraph 128XD (2 MB VRAM)|Display Interface=12.1" SVGA TFT Display, SVGA output|Sound=16-bit Sound Blaster PRO|Input Voltage=19 V DC|Current=2.4 A}}


The NEC VERSA 2760MT is a PC laptop from 1997 with a 166 MHz Intel Pentium MMX CPU and NeoMagic MagicGraph 128XD GPU.
The NEC VERSA 2760MT is a PC laptop from 1997 with a 166 MHz Intel Pentium MMX CPU and NeoMagic MagicGraph 128XD GPU.
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*If infrequently used the NiMH CMOS battery will leak
*If infrequently used the NiMH CMOS battery will leak
<gallery>
<gallery>
File:Nec versa 2760mt boot error 1.jpg|alt=First boot error caused by by internal rechargeable CMOS battery|First boot error caused by by internal rechargeable CMOS battery
File:Nec versa 2760mt boot error 1.jpg|alt=First boot error|First boot error
File:Nec versa 2760mt boot error 2.jpg|alt=Second boot error caused by by internal rechargeable CMOS battery|Second boot error caused by by internal rechargeable CMOS battery
File:Nec versa 2760mt boot error 2.jpg|alt=Second boot error|Second boot error
File:Nec versa 2760mt battery damage.jpg|alt=Damage to Motherboard caused by internal rechargeable CMOS battery|Damage to Motherboard caused by internal rechargeable CMOS battery
File:Nec versa 2760mt battery damage.jpg|alt=Damage to Motherboard|Damage to Motherboard
</gallery>
</gallery>


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====Solutions====
====Solutions====
*Attempt to repair original charger (difficult, glued/ultrasonically welded case)
*Attempt to repair original charger (difficult, glued/ultrasonically welded case)
*Buy new charger with correct specifications with NEC charger adapter (or splice existing charge cable)
*Buy new charger with correct specifications (19 V 2.4 A DC) with NEC charger adapter (or splice existing charge cable)


== Disassembly Notes ==
== Disassembly Notes ==
''See [[Disassembly:NEC_VERSA_2760MT|disassembly]] tab for step-by-step guide.''
*The plastic in this device is thin and extremely brittle, the design relies on the rigidity of the PCBs to support the weight of the device, '''you are very likely to break plastic pieces when attempting a repair'''.
*The plastic in this device is thin and extremely brittle, the design relies on the rigidity of the PCBs to support the weight of the device, '''you are very likely to break plastic pieces when attempting a repair'''.
*While this device uses machine screws and threaded metal inserts molded into the plastic case the plastic will shear easily.
*While this device uses machine screws and threaded metal inserts molded into the plastic case the plastic will shear easily.
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*Use ESD safe equipment
*Use ESD safe equipment


== Original Parts ==
=== Recommended Tools ===
=== Motherboard ===
{| class="wikitable"
|+
Fastener Drivers
!Fastener Types
!Sizes
!Notes
|-
|Phillips
|#0
|Recessed screws require thin driver shaft
|-
|Hex Nut
|5 mm
|For rear IO ports
|}
 
{| class="wikitable"
|+
Other Hand Tools
!Tool
!Notes
|-
|Tweezers
|Removing FFC cables, retrieving screw and general manipulation
|-
|Plastic Pry Tool
|To open FFC ZIFs and push in LCD connectors
|-
|Fastener Organizer
|There's a lot of similar screws but with different lengths, head shapes and threads
|}
==Original Parts ==
===Motherboard===
''RT6 R6MB VER=0.5A''
''RT6 R6MB VER=0.5A''
<gallery>
<gallery>
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=== IO Board ===
===IO Board===
''RT6 R6IO VER=0.4D''
''RT6 R6IO VER=0.4D''
<gallery>
<gallery>
Line 84: Line 118:
</gallery>
</gallery>


=== CPU Board ===
===CPU Board===
''RT6 R6CPU VER=0.3''
''RT6 R6CPU VER=0.3''
===Removable Battery===
<gallery>
File:18650-leak-1.jpg|alt=Leaking 18650 cell from disassembled battery|Leaking 18650 cell from disassembled battery
</gallery>


==Replacement Parts==
==Replacement Parts==
===Basic PCB Name===
Repairs conducted removed CN8, CN65 and SW50, so no replacement parts were sourced. However those appear to be Molex MicoBlade connectors and an unknown possibly wide SSOP style DIP double switch.
{| class="wikitable sortable"
|+Capacitors
! RefDes
! Qty
! Compatible Part Number
! Order Links
|-
|
|
|
|[https://www.digikey.com/ Digikey]
|}
''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.''
 
===Kits===
* Digikey BOM: https://www.digikey.com/


== Related Links ==
==Related Links==


== References ==
==References==
<references />
<references />
[[Category:Computer]]
[[Category:Computer]]
[[Category:1990s]]
[[Category:1990s]]
[[Category:WorkNeeded:OriginalParts]]
[[Category:WorkNeeded:ReplacementParts]]

Latest revision as of 09:19, 28 July 2024

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
NEC VERSA 2760MT
Preliminary Information
Release Year 1997
Leak Risk High
Batteries Yes, NiMH for CMOS + RTC and Li-Ion for main battery
Mounting Technology Through Hole, SMD, QFP, BGA, ZIF Sockets, FFCs, High Density Interconnects
Capacitor Types Aluminum Electrolytic, Tantalum, Ceramic, Polymer
Destructive Entry Yes, brittle plastics, sealed external PSU brick
Hardware Specifications
CPU Intel Pentium MMX @ 166 MHz
Memory Capacity 16 or 32 MB (upgradeable to 128 MB)
Memory Type EDO DRAM (socketed)
Storage 1x 2.5in 2.1 GB IDE HDD (up to 4 GB)
Graphics NeoMagic MagicGraph 128XD (2 MB VRAM)
Display Interface 12.1" SVGA TFT Display, SVGA output
Sound 16-bit Sound Blaster PRO
Power Requirements
Input Voltage 19 V DC
Current (Amps) 2.4 A

The NEC VERSA 2760MT is a PC laptop from 1997 with a 166 MHz Intel Pentium MMX CPU and NeoMagic MagicGraph 128XD GPU.

Known Issues

Unit does not turn on but battery charges or frequently encounters errors during boot sequence

CMOS NiMH battery has died

  • The rechargeable NiMH CMOS battery has a finite cycle life and will fail
  • If infrequently used the NiMH CMOS battery will leak
  • First boot error

    First boot error

  • Second boot error

    Second boot error

  • Damage to Motherboard

    Damage to Motherboard

Solutions

  • Remove or replace NiMH CMOS battery
  • Repair any corrosion damage from leaks
    • The computer will still boot without a CMOS battery however date/time and any configuration will not be retained
    • SW50 can be removed and the computer will still boot, I have no clue what it does
  • Motherboard after corroded components removed

    Motherboard after corroded components removed

  • IO Board after corroded components removed

    IO Board after corroded components removed

Unit lags heavily or freezes or turns off suddenly when running demanding applications

Thermal interface material between CPU and heatsink is bad

  • The thermal paste will eventually dry out
  • The thermal paste will eventually be 'pumped-out'
  • This leads to poor thermal performance and overheating

Solutions

  • Check rear fan is functional
  • Clean dust from heatsink & fan
  • Replace thermal paste on both top heat spreader, bottom heat spreader and CPU board package heat spreader.
  • Replaced thermal paste

    Replaced thermal paste

Unit does not turn on or charge, PSU LED does not illuminate

Mains charger PSU has failed

  • Unknown failure mode
  • Label on the mains power adapter

    Label on the mains power adapter

Solutions

  • Attempt to repair original charger (difficult, glued/ultrasonically welded case)
  • Buy new charger with correct specifications (19 V 2.4 A DC) with NEC charger adapter (or splice existing charge cable)

Disassembly Notes

See disassembly tab for step-by-step guide.

  • The plastic in this device is thin and extremely brittle, the design relies on the rigidity of the PCBs to support the weight of the device, you are very likely to break plastic pieces when attempting a repair.
  • While this device uses machine screws and threaded metal inserts molded into the plastic case the plastic will shear easily.
  • There are a number of thin flat-flex cables and locking/hinged FFC ZIFs in this device, they are difficult to manipulate and prone to damage.
  • There are a number of high density interconnects in this device, they must be disconnected and connected by applying even force without twisting the connectors to avoid damage.
  • Use ESD safe equipment

Recommended Tools

Fastener Drivers
Fastener Types Sizes Notes
Phillips #0 Recessed screws require thin driver shaft
Hex Nut 5 mm For rear IO ports
Other Hand Tools
Tool Notes
Tweezers Removing FFC cables, retrieving screw and general manipulation
Plastic Pry Tool To open FFC ZIFs and push in LCD connectors
Fastener Organizer There's a lot of similar screws but with different lengths, head shapes and threads

Original Parts

Motherboard

RT6 R6MB VER=0.5A

  • RT6 R6MB (Version 0.5A) PCB

    RT6 R6MB (Version 0.5A) PCB

  • RT6 R6MB (Version 0.5A) PCB

    RT6 R6MB (Version 0.5A) PCB Top Side

  • RT6 R6MB (Version 0.5A) PCB

    RT6 R6MB (Version 0.5A) PCB Bottom Side


IO Board

RT6 R6IO VER=0.4D

  • RT6 R6IO (Version 0.4D) PCB

    RT6 R6IO (Version 0.4D) PCB

  • RT6 R6IO (Version 0.4D) PCB

    RT6 R6IO (Version 0.4D) PCB Top Side

  • RT6 R6IO (Version 0.4D) PCB

    RT6 R6IO (Version 0.4D) PCB Bottom Side

CPU Board

RT6 R6CPU VER=0.3


Removable Battery

  • Leaking 18650 cell from disassembled battery

    Leaking 18650 cell from disassembled battery

Replacement Parts

Repairs conducted removed CN8, CN65 and SW50, so no replacement parts were sourced. However those appear to be Molex MicoBlade connectors and an unknown possibly wide SSOP style DIP double switch.

Related Links

References

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