Acer Travelmate 8431 Service Guide

							Chapter 463
Index of Symptom-to-FRU Error Message
LCD-Related Symptoms
Indicator-Related Symptoms
Power-Related Symptoms
Symptom / ErrorAction in Sequence
LCD backlight doesnt work
LCD is too dark
LCD brightness cannot be adjusted
LCD contrast cannot be adjustedEnter BIOS Utility to execute “Load Setup 
Default Settings”, then reboot system.
Reconnect the LCD connectors.
Keyboard (if contrast and brightness function 
key doesnt work).
LCD inverter ID
LCD cable
LCD inverter
LCD
System board
Unreadable LCD screen 
Missing pels in characters
Abnormal screen 
Wrong color displayedReconnect the LCD connector
LCD inverter ID
LCD cable
LCD inverter
LCD
System board
LCD has extra horizontal or vertical lines 
displayed.LCD inverter ID
LCD inverter
LCD cable
LCD
System board
Symptom / ErrorAction in Sequence
Indicator incorrectly remains off or on, but 
system runs correctly.Reconnect the inverter board
Inverter board
System board
Symptom / ErrorAction in Sequence
Power shuts down during operation. Power source (battery pack and power 
adapter). See “Power System Check” on page 
53. 
Battery pack
Power adapter
Hard drive & battery connection board
System board
The system doesn’t power-on. Power source (battery pack and power 
adapter). See “Power System Check” on page 
53. 
Battery pack
Power adapter
Hard drive & battery connection board
System board 
						

							64Chapter 4
PCMCIA-Related Symptoms
Memory-Related Symptoms
Speaker-Related Symptoms
Power Management-Related Symptoms
The system doesn’t power-off. Power source (battery pack and power 
adapter). See “Power System Check” on page 
53. 
Hold and press the power switch for more than 
4 seconds.  
System board
Battery can’t be charged. See “Check the Battery Pack” on page 53. 
Battery pack
System board
Symptom / ErrorAction in Sequence
System cannot detect the PC Card (PCMCIA).  PCMCIA slot assembly
System board
PCMCIA slot pin is damaged. PCMCIA slot assembly
Symptom / ErrorAction in Sequence
Memory count (size) appears different from 
actual size.Enter BIOS Setup Utility to execute “Load 
Default Settings”, then reboot system.
DIMM
System board
Symptom / ErrorAction in Sequence
In Windows, multimedia programs, no sound 
comes from the computer. Audio driver
Speaker
System board
Internal speakers make noise or emit no 
sound.Speaker
System board
Symptom / ErrorAction in Sequence
The system will not enter hibernation. Keyboard (if control is from the keyboard)
Hard disk drive
System board
The system doesnt enter hibernation mode 
and four short beeps every minute.Press Fn+
o and see if the computer enters 
hibernation mode.
Touchpad
Keyboard
Hard disk connection board
Hard disk drive
System board
The system doesn’t enter standby mode after 
closing the LCD.LCD cover switch
System board
Symptom / ErrorAction in Sequence 
						

							Chapter 465
The system doesnt resume from hibernation 
mode.Hard disk connection board
Hard disk drive
System board
The system doesnt resume from standby 
mode after opening the LCD.LCD cover switch
System board
Battery fuel gauge in Windows doesn’t go 
higher than 90%. Remove battery pack and let it cool for 2 
hours.
Refresh battery (continue use battery until 
power off, then charge battery).
Battery pack
System board
System hangs intermittently. Reconnect hard disk/CD-ROM drives. 
Hard disk connection board
System board
Symptom / ErrorAction in Sequence 
						

							66Chapter 4
Peripheral-Related Symptoms
Keyboard/Touchpad-Related Symptoms
Modem-Related Symptoms
NOTE: If you cannot find a symptom or an error in this list and the problem remains, see “Undetermined 
Problems” on page 68.
Symptom / ErrorAction in Sequence
System configuration does not match the 
installed devices. Enter BIOS Setup Utility to execute “Load 
Default Settings”, then reboot system.
Reconnect hard disk/CD-ROM/diskette drives.
External display does not work correctly. Press Fn+F5, LCD/CRT/Both display 
switching.
System board
USB does not work correctly. System board
Print problems. Ensure the “Parallel Port” in the “Onboard 
Devices Configuration” of BIOS Setup Utility is 
set to Enabled.
Onboard Devices Configuration
Run printer self-test.
Printer driver
Printer cable
Printer
System Board
Serial or parallel port device problems.Ensure the “Serial Port” in the Devices 
Configuration” of BIOS Setup Utility is set to 
Enabled.
Device driver
Device cable
Device
System board
Symptom / ErrorAction in Sequence
Keyboard (one or more keys) does not work. Reconnect the keyboard cable.
Keyboard
System board
Touchpad does not work. Reconnect touchpad cable.
Touchpad board
System board
Symptom / ErrorAction in Sequence
Internal modem does not work correctly. Modem phone port
modem combo board
System board 
						

							Chapter 467
Intermittent Problems
Intermittent system hang problems can be caused by a variety of reasons that have nothing to do with a 
hardware defect, such as: cosmic radiation, electrostatic discharge, or software errors. FRU replacement 
should be considered only when a recurring problem exists.
When analyzing an intermittent problem, do the following:
1.Run the advanced diagnostic test for the system board in loop mode at least 10 times.
2.If no error is detected, do not replace any FRU.
3.If any error is detected, replace the FRU. Rerun the test to verify that there are no more errors. 
						

							68Chapter 4
Undetermined Problems
The diagnostic problems does not identify which adapter or device failed, which installed devices are incorrect, 
whether a short circuit is suspected, or whether the system is inoperative.  
Follow these procedures to isolate the failing FRU (do not isolate non-defective FRU).
NOTE: Verify that all attached devices are supported by the computer.
NOTE: Verify that the power supply being used at the time of the failure is operating correctly. (See “Power 
System Check” on page 53).
1.Power-off the computer.
2.Visually check them for damage. If any problems are found, replace the FRU.
3.Remove or disconnect all of the following devices:
zNon-Acer devices
zPrinter, mouse, and other external devices
zBattery pack
zHard disk drive
zDIMM 
zCD-ROM/Diskette drive Module
zPC Cards
4.Power-on the computer.
5.Determine if the problem has changed.
6.If the problem does not recur, reconnect the removed devices one at a time until you find the failing FRU.
7.If the problem remains, replace the following FRU one at a time. Do not replace a non-defective FRU:
zSystem board
zLCD assembly 
						

							Chapter 569
Top View
TravelMate 8471/8431 M/B layout and connector location
TOP view
No.NameDescription
1 CN1 CCD cable CNTR
2 CN2 MMB cable CNTR
3 CN3 LVDS cable CNTR
4 CN4 Keyboard CNTR
5 CN5 Touch Pad FFC CNTR
6 CN6 SSD cable CNTR
7 CN7 Card reader CNTR
8 CN8 BT cable CNTR
9 CN15 Fan cable CNTR
10 CN21 Audio board CNTR
Jumper and Connector Locations
Chapter 5 
						

							70Chapter 5
Bottom View 
Bottom view
No.NameDescription
11 CN9 Battery CNTR
12 CN10 PCI-E socket
13 CN11 SIM card socket
14 CN12 PCI-E socket
15 CN13 Power cable CNTR
16 CN14 LVDS cable CNTR
17 CN16 DIMM socket
18 CN17 DIMM socket
19 CN19 HDD socket
20 CN20 USB board CNTR
21 U18 South Bridge
22 U14 North Bridge 
						

							Chapter 671
This chapter gives you the FRU (Field Replaceable Unit) listing in global configurations of TravelMate 8471/
8431. Refer to this chapter whenever ordering for parts to repair or for RMA (Return Merchandise 
Authorization).
Please note that WHEN ORDERING FRU PARTS, you should check the most up-to-date information available 
on your regional web or channel. For whatever reasons a part number change is made, it will not be noted on 
the printed Service Guide. For ACER AUTHORIZED SERVICE PROVIDERS, your Acer office may have a 
DIFFERENT part number code from those given in the FRU list of this printed Service Guide. You MUST use 
the local FRU list provided by your regional Acer office to order FRU parts for repair and service of customer 
machines.
NOTE: To scrap or to return the defective parts, you should follow the local government ordinance or 
regulations on how to dispose it properly, or follow the rules set by your regional Acer office on how to 
return it.
FRU (Field Replaceable Unit) List
Chapter 6 
						

							72Chapter 6
TravelMate 8471/8431 Exploded Diagram