Acer Aspire 5940g Service Guide

							Chapter 241
Using Boot Sequence Selector
The Boot Sequence Selector allows the boot order to be changed without accessing the BIOS. To use Boot 
Sequence Selector, perform the following steps:
1. Enter into DOS.
2. Execute  BS.exe to display the usage screen.
3. Select the desired boot sequenc e by entering the corresponding sequence. For example, enter  BS2 to 
change the boot sequence to HDD | CD ROM | LAN | Floppy. 
						

							42Chapter 2
Using DMITools
The DMI (Desktop Management Interface) Tool copies BIOS information to eeprom to be used in the DMI pool 
for hardware management. 
When the BIOS displays  Verifying DMI pool data it is checking the table corre lates with the hardware before 
sending to the operating system (Windows, etc.).
To update the DMI Pool, perform the following steps:
1. Boot into DOS.
2. Execute  dmitools.exe . The following messages are displayed  on the screen to prompt the dmitools 
mode.
• dmitools /r ==> Read dmi string from bios
• dmitools /wm xxxx ==> Write m anufacturer name to eeprom
• dmitools /wp xxxx ==> Writ e product name to eeprom
• dmitools /ws xxxx ==> Write serial number to eeprom
• dmitools /wu xxxx ==> Write uuid to eeprom
• dmitools /wa xxxx ==> Write asset tag to eeprom
The following examples show the commands and the corresponding output information.
Read DMI Information from Memory
Input:  
dmitools /r
Output:
Manufacturer (Type1, Offset04h): Acer
Product Name (Type1, Offset05h): TravelMate xxxxx
Serial Number (Type1, Offset07h): 01234567890123456789
UUID String (Type1, Offset08h): xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
Asset Tag (Type3, Offset04h): Acet Asstag
Write Product Name to EEPROM
Input:dmitools /wp Acer
Write Serial Number to EEPROM
Input:dmitools /ws 01234567890123456789
4). Write UUID to EEPROM (Cre ate UUID from Intel WFM20.pdf)
Input:
dmitools /wu
5). Write Asset Tag to EEPROM
Input:dmitools /wa Acet Asstag
NOTE:  When using any of  the Write options, restart the system  to make the new DMI data effective. 
						

							Chapter 243
Using the ICW50/ICY70 LAN MAC Utility
You can use the MAC.BAT utility to write the MAC.CFG file to the EEPROM under DOS mode.
1. Use a text editor (for example: Notepad) to open  the MAC.CFG file. You can see the MAC.CFG contents 
as below:
2. In DOS mode, run the  MAC.BAT file to write MAC values to eeprom.
WriteData = ‘001122334455 MAC value
StartAddr=7A MAC address
WriteLeng=6 MAC value length
KeepByte=0 don’t care 
						

							44Chapter 2 
						

							Chapter 345
Machine Disassembly and Replacement
IMPORTANT: The outside housing and color may vary from the mass produced model.
This chapter contains step-by-step procedures on how to disass emble the notebook computer for 
maintenance and troubleshooting.
Disassembly Requirements
To disassemble the computer, you need the following tools:
•Wrist grounding strap and conductive mat for preventing electrostatic discharge
•Flat screwdriver
•Philips screwdriver
•Plastic flat screwdriver
•Plastic tweezers
NOTE:  The screws for the different components vary in size. During the disassembly process, group the 
screws with the corresponding components to av oid mismatch when putting back the components.
IMPORTANT:  Various images depict the use of a regular meta l screwdriver, however, a plastic screwdriver is 
advised when disassembling parts near or around the mo therboard and to prevent scratching of the computer 
surface.
Chapter 3 
						

							46Chapter 3
General Information
Pre-disassembly Instructions
Before proceeding with the disassembly procedure, make sure that you do the following:
1. Turn off the power to the  system and all peripherals.
2. Unplug the AC adapter and all power and signal cables from the system. 
3. Place the system on a flat, stable surface. 
4. Remove the battery pack.
Disassembly Process
The disassembly process is divided into the following stages:
•External module disassembly
•Main unit disassembly
•LCD module disassembly
The flowcharts provided in the succeeding disassembl y sections illustrate the entire disassembly sequence. 
Observe the order of the sequence to avoid damage to  any of the hardware components. For example, if you 
want to remove the main board, you must first remove  the keyboard, then disassemble the inside assembly 
frame in that order.
Main Screw List 
ScrewQuantityPart Number
SCREW M2.5*3 23 86.PH702.001
SCREW M2*3 8 86.PH702.002
SCREW M2.5*3 23 86.PH702.003
SCREW M3*3 4 86.PH702.004
SCREW M2.5*5 12 86.PH702.005
SCREW M2.5*8 18 86.PH702.006 
						

							Chapter 347
External Module Disassembly Process
IMPORTANT: The outside housing and color may vary from the mass produced model.
External Modules Disassembly Flowchart
The flowchart below gives you a graphic representation  on the entire disassembly sequence and instructs you 
on the components that need to be removed during servicin g. For example, if you want to remove the main 
board, you must first remove the keyboard, then disa ssemble the inside assembly frame in that order.
NOTE:  Items enclosed with broken lines (— - - —) are optional and may not be present.
Screw List
StepScrewQuantityPart No.
ODD M2.5*5 186.PH702.005
M2*3 286.PH702.002
HDD M3*3 486.PH702.004
TV Tuner 
(optional) M2*3
286.PH702.002
WLAN Module M2*3 286.PH702.002
Disconnect pow er
and signal cables from system
Rem ove
Battery
Turn off system
and peripherals pow er
Rem oveDIMMs
Rem ove WLAN
Rem ove
HDDRem oveODD
Rem ove
Lower CoversRem ove
Dummy Cards
Rem ove
TV Tu ner 
						

							48Chapter 3
Removing the Battery Pack
1.Turn the computer over. 
2. Slide the battery lock to the unlocked position.
3. Slide and hold the battery release latch to the release po sition (1), then lift out the battery pack from the main 
unit (2).
1 2 
						

							Chapter 349
Removing the Express Dummy Card
1.Push the Express dummy card  all the way in to eject it.
2. Pull the card out from the slot. 
						

							50Chapter 3
Removing the SD Dummy Card
1.Push the SD dummy card all the way in to eject it.
2. Pull the card out from the slot.