Acer Travelmate 4020 Service Guide

Chapter 475
Index of Symptom-to-FRU Error Message
LCD-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...

76Chapter 4
PCMCIA-Related Symptoms
Symptom / ErrorAction in Sequence
System cannot detect the PC Card (PCMCIA)  PCMCIA slot assembly
System board
PCMCIA slot pin is damaged. PCMCIA slot assembly
Memory-Related Symptoms
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
Speaker-Related Symptoms
Symptom / ErrorAction in Sequence
In Windows, multimedia programs, no sound...

Chapter 477
NOTE: If you cannot find a symptom or an error in this list and the problem remains, see “Undetermined 
Problems” on page 79.
System hangs intermittently. Reconnect hard disk/CD-ROM drives. 
Hard disk connection board
System board
Peripheral-Related Symptoms
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...

78Chapter 4
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...

Chapter 479
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...

80Chapter 4 

Chapter 481
Top View
Jumper and Connector Locations
Chapter 4 

82Chapter 5
Rear View
ITEMDESCRIPTIONITEM DESCRIPTION
CN2 LCD Connector CN14 DC JACK 
CN3 LED board connector CN15 CRT connector 
SW2 Lid switch CN16 Docking connector 
CN10 express card connector CN17 Battery connector 
CN11 4 IN 1 connector CN18 Fix ODD connector 
CN13 Speaker connector  CN21 Swap ODD connector 
CN9 MD board connector CN24 2nd Battery connector 
CN12 INT MIC connector CN30 PATA HDD connector 
CN5 Keyboard connector CN31 SATA HDD connector 
  

Chapter 583
CN6 BT connector CN36 Line IN connector 
CN8 TP connector  CN34 MIC IN connector 
U4 VGA RAM CN35 Line out/SPDIF 
connector 
U8 VGA RAM CN33 USB connector 
U6 LAN transformer CN32 1394 connector 
CN28 PCMCIA connector  CN26 USB connector 
CN25 USB connector  CN23 S video connector 
CN20 RJ45/RJ11 connector  CN19 Fan connector 
CN22 MINI PCI connector  U31 CPU 
U30 EC U29 VGA Chp 
U34 North Bridge  U38 South Bridge 
U25 VGA RAM  U28 VGA RAM 
U24 BIOS ROM 
ITEMDESCRIPTIONITEM DESCRIPTION 

84Chapter 5
RTC Jumper