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Service Manual Troubleshooting and Diagnostics 3-11
Symptom Call Center: Suggestions
Repair Center:
Likely Causes
Repair Center:
Comments
Display
Dark display, no light Make sure notebook is turned on and
warmed up.
Check power supply.
Make sure SDRAM modules are
installed properly.
Adjust display brightness.
Press Fn+F5 several times.
Try external monitor.
Display cable connection
SDRAM modules
CPU module
Display assembly
Motherboard
Check cable
connections.
Replace SDRAM
modules.
Make sure CPU module
is installed properly,
replace CPU module.
Check display cable
connections, replace
display assembly.
If external monitor
displays no image,
replace motherboard.
White display Adjust display brightness. Display assembly
Switchboard PCA
Erratic display Display cable connection
Switchboard PCA
Display assembly
Motherboard
Check display cable
connection.
Bright or missing pixels or
lines.
See quality statement on page 5-3. Display cable connection
Display assembly
Check display cable
connection.
See quality statement on
page 5-3.
Punctured display Declared to be caused by
customer abuse.
Vertical crack near center
of display.
Usually caused by closing
display with pencil-sized
object on keyboard
Declared to be caused by
customer abuse.
Scratched display glass Declared to be caused by
customer abuse.
Local area of dark or light
discoloration visible when
display is on
Caused by excessive
pressure applied to area on
screen
Declared to be caused by
customer abuse.
External display does not
work
Check connections.
Press
Fn+F5 several times.
Try display on another computer.
External display
Motherboard
Hard disk
Hard disk never spins Check power source.
Remove and reinstall hard drive.
Check connector.
Hard drive or connector
Motherboard
If drive case is damaged,
drive may not operate
properly.
Hard disk makes clunking
or scratching noise
Back up disk immediately.
Was notebook or drive dropped?
Hard drive Check notebook and
drive for evidence of
customer abuse.
Hard disk makes buzzing
or whining noise
Back up disk immediately.
Check hard disk installation.
Check for alternate noise sources,
such as PCMCIA drive or fan.
Depends on noise source