NEC VERSA 2760MT

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

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

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

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.

Mains charger PSU has failed

 * Unknown failure mode

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

Tools

 * Phillips PH0 screw driver (slim shaft)
 * 5 mm hex nut driver
 * Tweezers
 * Plastic pry tool (top open FFC ZIFs and push in LCD connectors)
 * Screw organizer (there's a lot of similar screws but with different lengths, head shapes and threads)

Motherboard
RT6 R6MB VER=0.5A

IO Board
RT6 R6IO VER=0.4D

CPU Board
RT6 R6CPU VER=0.3

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.