compaq evo notebook n800c series User Manual

2–10Maintenance and Service Guide
Troubleshooting
2.3 Troubleshooting Flowcharts
Ta b l e  2 - 4
Troubleshooting Flowcharts Overview
Flowchart Description
2.1 Initial troubleshooting
2.2 No power, part 1
2.3 No power, part 2
2.4 No power, part 3
2.5 No power, part 4
2.6 No video, part 1
2.7 No video, part 2
2.8 Nonfunctioning docking station
2.9 No operating system (OS) loading
2.10 No OS loading from hard drive, part 1
2.11 No OS loading from hard drive, part 2
2.12 No OS loading from hard drive, part...

Troubleshooting
Maintenance and Service Guide2–11
Flowchart 2.1—Initial Troubleshooting
Connecting
to network
or modem?
Begin
troubleshooting.
Is there
power?
Is the OS
loading? Is there video?
(no boot)
Is there
sound?Beeps,
LEDs, or error
messages?
Keyboard/
pointing
device 
working?Go to
Section 2.17,
Nonfunctioning
Device. Go to
Section 2.2,
No Power.
Go to
Section 2.6,
No Video.All drives
working?
Y
Y
Y
Y
YY
Y
Y N N
N
N
N
End
N
N
N
Go to
Section 2.9,
No OS Loading.
Go to
Section 2.15,
No Audio.Go...

2–12Maintenance and Service Guide
Troubleshooting
Flowchart 2.2—No Power, Part 1
1. Reseat the power cables in the docking 
station and at the AC outlet.
2. Ensure the AC power source is active.
3. Ensure that the power strip is working.
Done
Remove from
docking station
(if applicable).
Power up
on battery
power?
Power up
on AC
power?
Power up
in docking
station?
Power up
on battery
power?
Power up
in docking
station?Done *Reset
power.
*Reset
power.Power up
on AC
power?
NY YN
N
YN
N
Y Y
YN
1. On some...

Troubleshooting
Maintenance and Service Guide2–13
Flowchart 2.3—No Power, Part 2
Continued from
Section 2.2,
No Power, Part 1.
Visually check for
debris in battery
socket and clean
if necessary.
Done
NY
Power on? Check battery by
recharging,
moving it to
another computer,
or replacing it.
Power on?
Done
Y
Replace
power supply
(if applicable).
N
Power on?
Done
YN
Go to
Section 2.4,
No Power,
Part 3.
268135-002.book  Page 13  Thursday, October 24, 2002  4:10 PM 

2–14Maintenance and Service Guide
Troubleshooting
Flowchart 2.4—No Power, Part 3
Continued from
Section 2.3,
No Power, Part 2.
Reseat AC adapter
in computer and
at power source.
Internal or
external AC
adapter? Done
Done
DoneDone Power on?
Power on?Power on? Plug directly
into AC outlet.
Power LED
on?
Power outlet
active?Try different
outlet.Replace external
AC adapter.
Replace
power cord.
Y
N
Y
Y Y
Y N
NN
N
External
Internal
Go to
Section 2.5,
No Power,
Part 4.
268135-002.book  Page 14  Thursday,...

Troubleshooting
Maintenance and Service Guide2–15
Flowchart 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*
*NOTE: Replace these items as a set to...

2–16Maintenance and Service Guide
Troubleshooting
Flowchart 2.6—No Video, Part 1
A
N
Stand-alone
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
Stand-alone
External
Adjust
brightness.
Video OK? Done
Y
Press lid
switch to ensure
operation.
Video OK?...

Troubleshooting
Maintenance and Service Guide2–17
Flowchart 2.7—No Video, Part 2
Y
N
Continued from
Section 2.6,
No Video, Part 1.
Done
Adjust external
monitor display.Video OK?Adjust
display
brightness.
Video OK?Video OK?
DoneDone
Check that notebook is properly
seated in docking station, for 
bent pins on cable, and for
monitor connection.Go to “A” in
Section 2.6,
No Video, Part 1.Check brightness
of external
monitor.
Try another
external
monitor.
Internal
and external
video OK?
Go to Section 2.8,...

2–18Maintenance and Service Guide
Troubleshooting
Flowchart 2.8—Nonfunctioning Docking Station
(if applicable)
Y
N
Reseat power 
cord in docking
station and
power outlet.
N
Replace the following docking station 
components 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...

Troubleshooting
Maintenance and Service Guide2–19
Flowchart 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
from 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.
No OS
Loading.*
*NOTE: Before beginning troubleshooting, 
always check cable connections, cable 
ends, and drives for bent or damaged pins....