Acer Aspire 5739 Service Guide

							Chapter 341
Removing BIOS Passwords:
If you key in the wrong Supervisor Password three times, System Disabled displays on the screen as below.
To reset the BIOS password, run BIOS_PW.EXE on a second machine as follows:
1.At a command prompt, type bios_pw 14452 0.
2.Select one string from the list. 
						

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3.Reboot the system and type the selected string (in this example qjjg9vy or 07yqmjd etc.) for the 
BIOS user password.
Cleaning BIOS Passwords
To clear the password, perform the following steps:
1.From a DOS prompt, Execute clnpwd.exe
2.Press 1 or 2 to clean the desired password shown on the screen.
The onscreen message determines whether the function is successful or not. 
						

							Chapter 343
Miscellaneous Utilities
Using Boot Sequence Selector
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 sequence by entering the corresponding sequence, for example, enter BS2 to change 
the boot sequence to HDD|CD ROM|LAN|Floppy.
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 correlates with the hardware before 
sending to the operating system (Windows, etc.).
To update the DMI Pool, perform the following steps:
1.Op[en a command prompt.
2.Execute dmitools.exe. The following messages show dmitools usage:
IMPORTANT:The following write examples (2 to 5) require a system reboot to take effect 
						

							44Chapter 3
Example 1: Read DMI Information from Memory
Input: 
dmitools /r 
Output:
Manufacturer (Type1, Offset04h): Acer
Product Name (Type1, Offset05h):  one xxxxx
Serial Number (Type1, Offset07h): 01234567890123456789
UUID String (Type1, Offset08h): xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
Asset Tag (Type3, Offset04h): Acer Asstag
Example 2: Write Product Name to EEPROM
Input:
dmitools /wp Acer
Example 3: Write Serial Number to EEPROM
Input:
dmitools /ws 01234567890123456789
Example 4: Write UUID to EEPROM
Input:
dmitools /wu
Example 5: Write Asset Tag to EEPROM
Input:
dmitools /wa Acer Asstag
Using the LAN MAC Utility
Perform the following steps to write MAC information to eeprom:
1.Use a text editor, for example Notepad, to edit the MAC.CFG file as shown:
• WriteData= 001122334455 
						

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							46Chapter 3 
						

							Chapter 347
Machine Disassembly and Replacement
This chapter contains step-by-step procedures on how to disassemble 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 avoid mismatch when putting back the components.
Chapter 3 
						

							48Chapter 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 disassembly 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 
DescriptionQuantityAcer P/N
M2.0D 3.0L K4.6D 0.8T ZK 17 86.AD302.001
M2.5D 3.0L K5.5D 0.8T ZK 15 86.AD302.002
M2.5D 5L K 5.5D ZK NL 21 86.AD302.003
M2.5D 10.0L K 5.5D 0.8T ZK 12 86.AD302.004
M3.0D 3.0L K 4.9D NI+  4 86.AD302.005
M2.5D 3.2L K 6D NI+ 4 86.AD302.006 
						

							Chapter 349
External Module Disassembly Process
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 servicing. 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.
Screw List
Removing the Battery Pack
1.Turn computer over. 
StepScrewQuantityPart No.
WLAN Module M2*3 2 86.AD302.001
HDD Carrier M3*3 4 86.AD302.005
ODD Module M2.5*5 1 86.AD302.003
ODD Bracket M2*3 2 86.AD302.001
Rem ove
Lower Covers
Rem ove
NewCard
Dummy
Disconnect pow er
and signal cables
from system
Rem ove
Battery
Turn off system
and peripherals
pow er
Rem ove
DIMMs
Rem ove
SD Dummy
Rem ove
HDDRem ove
TV Tu nerRem ove
WLAN
Rem ove
ODD
Rem ove
VGA Card
Rem ove
CPU 
						

							50Chapter 3
2.Slide the battery lock/unlock latch to the unlock position. 
3.Slide and hold the battery release latch to the release position (1), then lift out the battery pack from the main 
unit (2). 
Removing the SD dummy card
1.Push the SD dummy card all the way in to eject it.
1
2