compaq notebook evo n150 series User Manual

							2–8Maintenance and Service Guide
Troubleshooting
2.5 No Power, Part 4
Y
N
Continued from
Section 2.4,
No Power, Part 3
Reseat loose
components and
boards and
replace
damaged items. Open
computer.
Loose or
damaged
parts?
Y
Close
computer and
retest.
Power on?
Done
N
Replace the following items, if applicable.
Check computer operation after each
replacement:
1. Internal DC-DC converter*
2. Internal AC adapter
3. Processor board*
4. System board*
* Replace these items as a set to prevent
shorting out among the components. 
						

							Troubleshooting
Maintenance and Service Guide2–9
2.6 No Video, Part 1
A
N
Standalone
or Docking
Station? No Video
Replace the following one at a time. Test after each replacement:
1. Cable between notebook and computer display (if applicable)
2. Inverter board (if applicable)
3. Display
4. System board
Internal or
external
display*?Adjust
brightness.Video OK? Done Docking
Station
Internal
Standalone
External
Adjust
brightness.
Video OK? Done
Y
Depress lid
switch to ensure
operation.
Video OK? Done
Y
N
Video OK?
DoneDone
N
Check for bent
pins on cable.
Tr y
another
display.Internal and
external
video OK?Replace
system
board.
YYN N
*Note:To change from internal to
external display, use the hotkey
combination.
Y
Go to
Section 2.7,
No Video, Part 2 
						

							2–10Maintenance and Service Guide
Troubleshooting
2.7 No Video, Part 2
Y
N
Continued from
Section 2.6,
No Video, Part 1
Done Video OK?
Adjust external
monitor display.Adjust
display
brightness.
Video OK?Video OK?
Done Done
Check for notebook properly
seated in docking station, bent
pins on cable, and for monitor
connection.Go to “A” in
Section 2.6,
No Video, Part 1.Check brightness
of external
monitor.
Tr y a n o t h e r
external
monitor.
Internal
and external
video OK?
Go to Section 2.8,
Non Functioning
Docking Station.
YY
Y N
N
N
Remove
notebook from
docking station,
if connected. 
						

							Troubleshooting
Maintenance and Service Guide2–11
2.8 Non Functioning Docking Station
(if applicable)
Y
N
Reseat power
cord in docking
station and
power outlet.
N
Replace these docking station com-
ponents one at a time. Check computer
operation after each replacement:
1. Power supply
2. I/O board
3. Backplane board
4. Switch box
5. Docking motor mechanism
Check voltage
setting on
docking station.
Reset monitor
cable connector at
docking station.Reinstall
notebook into
docking station.
Docking
station
operating?
Docking
station
operating?
Remove
notebook, reseat
all internal parts,
and replace any
damaged items in
docking station.DoneDone
Y 
						

							2–12Maintenance and Service Guide
Troubleshooting
2.9 No Operating System (OS) Loading
No OS loading
from Hard drive,
go to
Section 2.10.
Reseat power
cord in docking
station and
power outlet.
No OS loading
form Diskette
drive, go to
Section 2.13.
No OS loading
from CD- or
DVD-ROM drive,
go to
Section 2.14.
No OS loading
from Network,
go to
Section 2.20.
Note:Before beginning, always check
cable connections, cable ends, and drives
for bent or damaged pins. 
						

							Troubleshooting
Maintenance and Service Guide2–13
2.10 No OS Loading from Hard Drive, Part 1
Go to
Section 2.17,
Non Functioning
Device.
Y
Done
N
OS not
loading from
hard drive.
Non-
system disk
message?Go to
Section 2.11,
No OS Loading
from Hard Drive,
part 2.
Reseat
external
hard drive.
OS loading?
Done
Boot
from
CD?
Go to
Section 2.13,
No OS
Loading from
Diskette Drive.
Boot
from
hard drive?
Boot
from
diskette?
Change boot
priority through
the setup utility
and reboot.
Boot
from
hard drive?
Y Y
Y YY
N N
N N N
Check the setup
utility for correct
booting order. 
						

							2–14Maintenance and Service Guide
Troubleshooting
2.11 No OS Loading from Hard Drive, Part 2
Continued from
Section 2.10,
No OS Loading
from Hard Drive,
Part 1
Reseat
hard drive.
Done CD or
diskette in
drive?1. Replace hard
drive.
2. Replace system
board.
Go to
Section 2.13,
No OS Loading
from Diskette
Drive.
Load OS using
Restore CD if
applicable. Format hard drive
and bring to a
bootable C:\
prompt.Create partition,
then format hard
drive to bootable
C:\ prompt.
Boot
from diskette
drive? Remove
diskette and
reboot.
YN
Boot
from
hard drive?
Y
N
YN
Access
hard
drive?
YN
Access
hard drive?Done
Run FDISK.
Y
N
Hard drive
partition?
Hard drive
formatted?
YN
YN
Computer
boot?
Done
Y
N
Go to
Section 2.12,
No OS Loading
from Hard Drive,
Part 3.Go to
Section 2.12,
No OS Loading
from Hard Drive,
Part 3. 
						

							Troubleshooting
Maintenance and Service Guide2–15
2.12 No OS Loading from Hard Drive, Part 3
Y
System
files on hard
drive? Continued from
Section 2.11,
No OS Loading
from Hard Drive,
Part 2.
Clean virus.
Done
N
Install OS
and reboot.
Virus
on hard
drive?OS
loading from
hard drive?
Y
NY
N
Y
N
Diags
on diskette?Replace
hard drive.
Run diags
and follow
recommendations Run SCANDISK
and check for
bad sectors.
Can bad
sectors
be fixed?Replace
hard drive.
YN
YN
Fix bad
sectors.Boot from
hard drive?Replace
hard drive.
Done 
						

							2–16Maintenance and Service Guide
Troubleshooting
2.13 No OS Loading from Diskette Drive
Done
Y
N
Reseat
diskette drive. OS not loading
from
diskette drive.
Done
Y
YY Y
Y
Y Y N
N
N NN
NN
OS
loading?
Non-
System Disk
message?Bootable
diskette
in drive?Install bootable
diskette and
reboot computer.
Check diskette
for system files.
Tr y d i f f e r e n t
diskette.
1. Replace
diskette drive.
2. Replace system
board. Non System
Disk error?
OS
loading? Boot
from another
device?
Enable drive
andcoldboot
computer.
Diskette
drive boot
order.
Change boot
priority using
the setup utility.Go to
Section 2.17,
Non Functioning
Device.
Diskette
drive enabled
in the setup
utility?
Go to
Section 2.17,
Non Functioning
Device Clear CMOS.
Refer to Section
1.2, “Clearing a
Password,” for
instructions. 
						

							Troubleshooting
Maintenance and Service Guide2–17
2.14 No OS Loading from CD- or
DVD-ROM Drive
Y
Done
N
Bootable
disk in
drive? Disk
in drive? No OS
loading from
CD- or
DVD-ROM drive.Install bootable
disk and
reboot
computer.
Go to
Section 2.17,
Non Functioning
Device.
Go to
Section 2.17,
Non Functioning
Device Install
bootable disk.
Boots from
CD or DVD?
Boots from
CD or DVD?Try another
bootable
disk.
Booting
from another
device?
Booting
order
correct?
Correct boot
order using
the setup utility.Done Reseat
drive.
Y
Y Y Y
Y
N NN
N
N
Clear CMOS.
Refer to Section
1.2, “Clearing a
Password,” for
instructions.