Acer Travelmate 550 Service Guide

Chapter 473
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 Defaults” on Exit screen, 
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...

74Chapter 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.DIMM
System board
Speaker-Related Symptoms
Symptom / ErrorAction in Sequence
In Windows, multimedia programs, no sound 
comes from the computer. Audio driver
Speaker
System board
Internal speakers...

Chapter 475
NOTE: If you cannot find a symptom or an error in this list and the problem remains, see “Undetermined 
Problems” on page 77. Peripheral-Related Symptoms
Symptom / ErrorAction in Sequence
System configuration does not match the 
installed devices. Enter BIOS Setup Utility to execute “Load Setup defaults”, then 
reboot system.
Reconnect hard disk/CD-ROM/diskette drives.
External display does not work correctly. Press Fn+F5, LCD/CRT/Both display switching
See “System Diagnostic Diskette” on...

76Chapter 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 477
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...

78Chapter 4
Index of AFlash BIOS Error Message
Error MessageAction in Sequence
Hardware Error  See “System Diagnostic Diskette” on page 45
VPD Checksum Error Reboot the system and then restest with this diskette.
BIOS Update Program Error Turn off the power and restart the system.
System Error Make sure this AFlash BIOS diskette for this model.
Without AC adapter make sure to connect AC adapter
Battery Low make sure to install a highly charged battery, and reboot 
system. 

Chapter 479
Index of PQA Diagnostic Error Code, Message
Error CodeMessageAction in Sequence
16XXX Backup battery error Backup battery
01XXX CPU or main board error Reload BIOS default setting.
System board
02XXX Memory error DIMM
System board
03XXX Keyboard error Reset Keyboard
Keyboard
System board
04XXX Video error System board
05XXX Parallel Port error System board
06XXX Serial port or main board error System board
07XXX Diskette drive error Diskette drive
System board
08XXX Hard disk error Reload...

80Chapter 4 

Chapter 581
To p  V i e w
PCB 01200-S
SW2 POWER.-BTN
JP2 LCD
SW2 Power On/Off button JP1 It is software debug only, normally 
shiping on this connector
JP2 LCD connector JP7 FDD connector
SW1 LID switch JP6 Internal keyboard connector
JP3 System Board connector JP4 Switch board connector
PIN NOSignalPIN NOSignal
1. ON/OFF BTN# 2. ON/OFF BTN#
3. GND 4. GND
PIN NOSignalPIN NOSignal
1. +5VALW 2. GND
3. +5VALW 4. GND
5. NC 6. NC
7. 20 INVT_PWN 8. DISPOFF#
9. +5VALW 10. LCDDVDD
Jumper and Connector Locations...

82Chapter 5
SW1 LID-SW
JP3 HEADERX.PRT
JP1 DEBUG-9.PRT
11. +5VALW 12. LCDVDD
13. +3VS 14. LCDDVGA
15. +3VS 16. LCDDVGA
17. GND 18. GND
19. NC 20. L LCD0
21. GND 22. L LCD1
23. PID0 24. GND
25. PID1 26. L LCD2
27. PID2 28. L LCD3
29. PID3 30. GDN
31. ENVDD 32. L LCD4
33. DISPOFF# 34. L LCD5
35. L LCD15 36. GDN
37. L LCD14 38. L LCD6
39. GND 40. L LCD7
41. L LCD13 42. GDN
43. L LCD12 44. L LCD8
45. GND 46. L LCD9
47. L LCD11 48. GDN
49. L LCD10 50. NC
PIN NOSignalPIN NOSignal
1. GND 2. GND
3. LID_SW# 4....