Chapter 4
99
Error Message List
No beep Error Messages
FRU/Action in Sequence
No beep, power-on indicator turns off and
LCD is blank.
Power source (battery pack and power adapter). See “Power
System Check” on page 95..
Ensure every connector is connected tightly and correctly.
Reconnect the DIMM.
LED board.
Mainboard.
No beep, power-on indicator turns on and
LCD is blank.
Power source (battery pack and power adapter). See “Power
System Check” on page 95..
Reconnect the LCD connector
Hard disk drive
LCD inverter ID
LCD cable
LCD Inverter
LCD
Mainboard
No beep, power-on indicator turns on and
LCD is blank. But you can see POST on an
external CRT.
Reconnect the LCD connectors.
LCD inverter ID
LCD cable
LCD inverter
LCD
Mainboard
No beep, power-on indicator turns on and a
blinking cursor shown on LCD during
POST.
Ensure every connector is connected tightly and correctly.
Mainboard
No beep during POST but system runs
correctly.
Speaker
Mainboard
SG_TM4720_4320_Book.book Page 99 Friday, April 20, 2007 11:14 AM
Summary of Contents for TravelMate 4720 Series
Page 10: ...x ...
Page 48: ...38 Chapter 1 ...
Page 76: ...66 Chapter 3 5 Disconnect the keyboard cable from the mainboard to remove the keyboard ...
Page 91: ...Chapter 3 81 16 Carefully detach the speaker modules as shown ...
Page 102: ...92 Chapter 3 ...
Page 120: ...110 Chapter 4 ...
Page 121: ...Chapter 5 111 System Block Diagram System Block Diagram and Connector Locations Chapter 5 ...
Page 122: ...112 Chapter 5 Board Layout Top and Bottom View ...
Page 126: ...116 Chapter 5 ...
Page 128: ...118 Chapter 4 Travelmate 4720 4320 Exploded Diagram ...
Page 141: ...131 Appendix A ...
Page 142: ...Appendix A 132 ...
Page 146: ...136 Appendix C ...