NEC VERSA 2760MT: Difference between revisions
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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 | 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 | 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 | 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 | ||
</gallery> | </gallery> | ||
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**The computer will still boot without a CMOS battery however date/time and any configuration will not be retained | **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 | **SW50 can be removed and the computer will still boot, I have no clue what it does | ||
<gallery> | |||
File:Nec versa 2760mt motherboard damage.jpg|alt=Motherboard after corroded components removed|Motherboard after corroded components removed | |||
File:Nec versa 2760mt io board damage.jpg |alt=IO Board after corroded components removed|IO Board after corroded components removed | |||
</gallery> | |||
===Unit lags heavily or freezes or turns off suddenly when running demanding applications=== | ===Unit lags heavily or freezes or turns off suddenly when running demanding applications=== | ||
Revision as of 02:51, 7 February 2022
| 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 | 
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NEC VERSA 2760MT
| Preliminary Information | |
|---|---|
| Release Year | 1997 |
| Leak Risk | High |
| Batteries | Yes, CMOS NiMH Rechargeable |
| Mounting Technology | Through Hole, SMD, QFP, BGA, ZIFs Sockets, FFCs, High Density Interconnects |
| Capacitor Types | Aluminum Electrolytic, Tantalum, Ceramic, Polymer |
| Destructive Entry | Yes, brittle plastics |
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 caused by by internal rechargeable CMOS battery
-
Second boot error caused by by internal rechargeable CMOS battery
-
Damage to Motherboard caused by internal rechargeable CMOS battery
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
-
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
-
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
Solutions
- 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)
Disassembly Notes
- 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.
- 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
Original Parts
Motherboard
RT6 R6MB VER=0.5A
-
RT6 R6MB (Version 0.5A) PCB
-
RT6 R6MB (Version 0.5A) PCB Top Side
-
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 Top Side
-
RT6 R6IO (Version 0.4D) PCB Bottom Side
CPU Board
RT6 R6CPU VER=0.3
Replacement Parts
Basic PCB Name
| 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.
Kits
- Digikey BOM: https://www.digikey.com/