Acer TravelMate 4720 Series, Service Manual

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Chapter 4 105
The system doesn’t power-off. Power source (battery pack and power adapter). See “Power
System Check” on page 95.
Hold and press the power switch for more than 4 seconds.
Mainboard
Battery can’t be charged See “Check the Battery Pack” on page 95.
Battery pack
Mainboard
PCMCIA-Related Symptoms
Symptom / Error Action in Sequence
System cannot detect the PC Card
(PCMCIA) PCMCIA slot assembly
Mainboard
PCMCIA slot pin is damaged. PCMCIA slot assembly
Memory-Related Symptoms
Symptom / Error Action in Sequence
Memory count (size) appears different from
actual size. Enter BIOS Setup Utility to execute “Load Default Settings, then
reboot system.
DIMM
Mainboard
Speaker-Related Symptoms
Symptom / Error Action in Sequence
In Windows, multimedia programs, no
sound comes from the computer. Audio driver
Speaker
Mainboard
Internal speakers make noise or emit no
sound. Speaker
Mainboard
Power Management-Related Symptoms
Symptom / Error Action in Sequence
The system will not enter hibernation See “Save to Disk (S4)” on page 44.
Keyboard (if control is from the keyboard)
Hard disk drive
Mainboard
The system doesn't 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
Mainboard
The system doesn’t enter standby mode
after closing the LCD See “Save to Disk (S4)” on page 44.
LCD cover switch
Mainboard
Power-Related Symptoms
Symptom / Error Action in Sequence
SG_TM4720_4320_Book.book Page 105 Friday, April 20, 2007 11:14 AM