t
Maintenance and Service
Guide
HP Compaq tc4400 Tablet PC
Document Part Number: 383208-002
May 2006
This guide is a troubleshooting reference used for maintaining
and servicing the tablet PC. It provides comprehensive
information on identifying tablet PC features, components, and
spare parts; troubleshooting tablet PC problems; and performing
tablet PC disassembly procedures.
1 Product Description
1.1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–2
2.1 Computer Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–1
Using Computer Setup . . . . . . . . . . . . . . . . . . . . . . . 2–1
Selecting from the File Menu . . . . . . . . . . . . . . . . . . 2–2
Selecting from the Security Menu . . . . . . . . . . . . . . 2–3
Selecting from the Diagnostics Menu. . . . . . . . . . . . 2–4
Selecting from the System Configuration Menu. . . . 2–5
2.2 Troubleshooting Flowcharts . . . . . . . . . . . . . . . . . . . 2–6
Maintenance and Service Guide
iii
Contents
3.2 Computer Major Components. . . . . . . . . . . . . . . . . . 3–2
Plastic Parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–2
Cables and Connectors . . . . . . . . . . . . . . . . . . . . . . . 4–2
4.3 Preventing Damage to Removable Drives . . . . . . . . 4–3
4.4 Preventing Electrostatic Damage . . . . . . . . . . . . . . . 4–4
4.5 Packaging and Transporting Precautions . . . . . . . . . 4–5
4.6 Workstation Precautions . . . . . . . . . . . . . . . . . . . . . . 4–6
4.7 Grounding Equipment and Methods. . . . . . . . . . . . . 4–7
iv
Maintenance and Service Guide
5.17 Top Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–43
5.18 TouchPad. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–47
5.19 Speaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–51
5.20 Infrared Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–53
5.21 System Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–55
5.22 Modem Module. . . . . . . . . . . . . . . . . . . . . . . . . . . 5–60
5.23 RTC Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–62
Maintenance and Service Guide
v
Contents
6 Specifications
A Screw Listing
D Connector Pin Assignments
E Power Cord Set Requirements
Index
vi
Maintenance and Service Guide
Product Description
1.1 Features
■
Intel Core Duo T2600 (2.17-GHz), T2500 (2.00-GHz),
T2400 (1.83-GHz), and T2300 (1.67-GHz) or Intel
Celeron M 1.60-GHz processors, varying by tablet PC model
■
■
■
12.1-inch, XGA, TFT (1024 × 768) display with over
16.8 million colors
100-, 80-, or 60-GB high-capacity hard drive, varying by
tablet PC model
256-MB DDR2 synchronous DRAM (SDRAM) at 633 MHz
and 533 MHz, expandable to 4.0 GB
■
■
■
Microsoft® Windows® XP Tablet Edition
Full-size Windows keyboard with embedded numeric keypad
TouchPad and pointing stick pointing devices, including a
dedicated vertical scroll region
■
Integrated 10Base-T/100Base-T/1000Base-T Ethernet local
area network (LAN) network interface card (NIC) with RJ-45
jack
■
■
Integrated high-speed 56K modem with RJ-11 jack
Integrated wireless support for Mini PCI IEEE 802.11b/g and
802.11a/b/g WLAN device
■
Support for one Type I or Type II PC Card slot, with support
for both 32-bit (CardBus) and 16-bit PC Cards
1–2
Maintenance and Service Guide
Product Description
■
■
■
■
■
External 65-watt AC adapter with 3-wire power cord
6-cell Li-Ion battery pack
Audio speaker
Volume up, volume mute, and volume down buttons
Connectors:
❏ Infrared
❏ Audio-out (headphone)
❏ Audio-in (microphone)
❏ Universal Serial Bus (USB) v. 2.0 (3 ports, 1 powered)
❏ Power
❏ External monitor
❏ RJ-45 (network)
❏ RJ-11 (modem)
❏ S-Video-out
❏ PC Card
❏ Digital Media Slot
❏ Primary battery pack
❏ Travel battery pack
❏ Docking connector
Maintenance and Service Guide
1–3
Product Description
1.2 Resetting the Tablet PC
If the tablet PC you are servicing has an unknown password,
clear CMOS.
The following steps will not clear an unknown password if the
stringent security option has been enabled in the BIOS. If
stringent security is enabled, the system board must be replaced
to reset an unknown password. Refer to Section 5.21, “System
✎
Before replacing the system board, perform the steps below to
make sure stringent security has been properly enabled.
Enabling stringent security provides enhanced prtotection for the
power-on password and administrator password and other forms
of power-on authorization. Stringent security is enabled/disabled
by accessing the Password Options menu in the Computer Setup
information.
1. Prepare the tablet PC for disassembly (refer to Section 5.3,
“Preparing the Tablet PC for Disassembly,” for more
information).
2. Remove the real-time clock (RTC) battery (refer to
Section 5.23, “RTC Battery,” for more information on
removing and replacing the RTC battery).
3. Wait approximately 5 minutes.
4. Replace the RTC battery and reassemble the tablet PC.
5. Connect AC power to the tablet PC. Do not reinsert any
batteries at this time.
6. Turn on the tablet PC.
All passwords and all CMOS settings have been cleared.
1–4
Maintenance and Service Guide
Product Description
1.3 Power Management
The tablet PC comes with power management features that
extend battery pack operating time and conserve power. The
tablet PC supports the following power management features:
■
■
■
■
■
■
■
■
Standby
Hibernation
Setting customization by the user
Hotkeys for setting the level of performance
Battery calibration
Lid switch resume
Power button
Advanced Configuration and Power Management (ACPM)
compliance
Maintenance and Service Guide
1–5
Product Description
1.4 External Components
The external components on the front of the tablet PC are shown
below and described in Table 1-1.
Front Components
Table 1-1
Front Components
Item
Component
Function
1
Wireless light
On: An integrated wireless device, such as
a wireless local area network (WLAN)
device and/or Bluetooth® device is turned
on.
2
Power light
■ On: The computer is on.
■ Blinking green: The computer is in
standby.
■ Blinking rapidly: An HP Smart AC
Adapter with a higher power rating
should be connected.
■ Off: The computer is off or in hibernation.
1–6
Maintenance and Service Guide
Product Description
Table 1-1
Front Components (Continued)
Item
Component
Function
3
Battery light
■ Amber: A battery pack is charging.
■ Green: A battery pack is close to full
charge capacity.
■ Blinking amber: A battery pack that is the
only available power source has reached
a low-battery condition. When the battery
pack reaches a critical low-battery
condition, the battery light begins
blinking more quickly.
■ Off: If the computer is connected to
an external power source, the light
is turned off when all batteries in the
computer are fully charged. If the
computer is not connected to an external
power source, the light is turned off until
the battery pack reaches a low-battery
condition, when the light begins blinking
amber.
4
5
Drive light
■ Blinking green: The hard drive or optical
drive is being accessed.
■ Amber: HP Mobile Data Protection has
temporarily parked the hard drive.
Infrared port
Provides wireless communication between
the computer and an optional
IrDA-compliant device.
6
7
Display release button
Fingerprint reader
Opens the tablet PC.
Allows a fingerprint logon to Windows
instead of using a password.
Maintenance and Service Guide
1–7
Product Description
Table 1-2
Right-Side Components
Function
Item
Component
1
Audio-out
(headphone) jack
Produces computer sound when connected
to optional power stereo speakers,
headphones, ear buds, a headset, or
television audio.
2
3
Audio-in (microphone)
jack
Connects an optional computer headset
microphone, stereo array microphone, or
monoarual microphone.
Powered USB port
Connects USB 1.1- or 2.0-compliant
devices to the tablet PC using a standard
USB cable, or connects an optional external
MultiBay or external MultiBay II to the
tablet PC. This USB port is a powered port
that can be used without external power.
4
PC Card slot or
optional smart card
reader
On select tablet PC models, the PC
✎
Card slot may be replaced with an
optional smart card reader.
If your tablet PC has
■ a PC Card slot, it supports optional
Type I, Type II, 32-bit (CardBus), or
16-bit PC Cards.
■ a smart card reader, it accepts smart
cards or Java™ Cards.
5
Digital Media Slot
Supports Secure Digital (SD) Memory
Cards and MultiMediaCards (MMC).
Maintenance and Service Guide
1–9
Product Description
The external components on the left side of the tablet PC are
shown below and described in Table 1-3.
Left-Side Components
Table 1-3
Left-Side Components
Item Component
Function
1
Security cable slot
Attaches an optional security cable to the
tablet PC.
The purpose of security solutions is
✎
to act as deterrents. These
deterrents may not prevent a product
from being mishandled or stolen.
2
Vent
Provides airflow to cool internal
components.
To prevent overheating, do not
Ä
obstruct vents. Use the computer
only a hard, flat surface. Do not allow
a hard surface, such as an adjoining
printer, or a soft surface, such as
pillows or thick rugs or clothing, to
block airflow.
Depending on the tablet PC model,
✎
vents vary in number and location.
1–10
Maintenance and Service Guide
Product Description
Table 1-3
Left-Side Components (Continued)
Item Component
Function
3
Wireless button
Turns the wireless functionality of the
WLAN or Bluetooth device on or off, but
does not establish a connection.
To establish a wireless connection,
✎
a wireless network must already be
set up.
4
USB port
Connects a USB 1.1- and 2.0-compliant
device to the tablet PC using a standard
USB cable.
5
6
Info Center button
Power switch
Launches Info Center, which enables you
to open various software solutions.
When the tablet PC is
■ Off, slide toward the front of the
tablet PC and release to turn on the
tablet PC.
■ In standby, slide toward the front of the
tablet PC and release to exit standby.
■ In hibernation, slide toward the front of
the tablet PC and release to exit
hibernation.
If the tablet PC has stopped responding
and Microsoft Windows shutdown
procedures cannot be used, slide toward
the front of the tablet PC and hold for
4 seconds to turn off the tablet PC.
7
Speaker
Enables you to listen to music and hear
audio alerts and signals from programs.
Maintenance and Service Guide
1–11
Product Description
Table 1-4
Rear Panel Components
Function
Item Component
1
USB port
Connects USB 1.1- and 2.0-compliant
devices to the tablet PC using a standard
USB cable.
2
3
RJ-11 (modem) jack
RJ-45 (network) jack
Connects a modem cable. Enabled with
56-K connectivity.
Connects a network cable. Enabled with
10BASE-T/100BASE-TX/1000BASE-T
connectivity.
4
5
6
Smart adapter power
connector
Connects an AC adapter, an optional
AC adapter, or an optional power cable.
External monitor port
Connects an optional VGA external monitor
or projector.
S-Video-out jack
Is a 7-pin, dual-purpose jack.
It connects an optional S-Video device,
such as a television, VCR, camcorder,
overhead projector, or video capture card,
with an optional, standard (4-pin) S-Video
cable.
The extra 3 pins also enable an optional
S-Video-to-composite adapter to be used
with the tablet PC.
Maintenance and Service Guide
1–13
Product Description
Table 1-5
Standard Keyboard Components
Item
Component
Function
1
Function keys (6)
Perform system and application tasks.
When combined with the fn key, the
function keys f3, f4, and f8 through f11
perform additional tasks as hotkeys.
2
3
caps lock key
Enables caps lock and turns on the caps
lock light.
fn key
Executes frequently used system
functions when pressed in combination
with a function key or the esc key.
4
5
Windows logo key
Displays the Microsoft Windows
Start menu.
Windows
applications key
Displays a shortcut menu for items
beneath the pointer.
6
7
Arrow keys
Moves the cursor around the screen.
Embedded numeric
keypad
Can be used like an external numeric
keypad.
8
num lock key
Enables numeric lock, turns on the
embedded numeric keypad, and turns
on the num lock light.
Maintenance and Service Guide
1–15
Product Description
Table 1-6
Top Components
Function
Item
Component
1
Left and right
TouchPad buttons (2)
Function like the left and right buttons on
an external mouse.
2
3
TouchPad
Moves the pointer. Can be set to perform
other mouse functions, such as scrolling,
selecting, and double-clicking.
Left and right pointing
stick buttons (2)
Function like the left and right buttons on
an external mouse.
4
5
Pointing stick
Vent
Moves the pointer.
Provides airflow to cool internal
components.
To prevent overheating, do not
Ä
obstruct vents. Use the computer
only a hard, flat surface. Do not
allow a hard surface, such as an
adjoining printer, or a soft surface,
such as pillows or thick rugs or
clothing, to block airflow.
6
Presentation button
Volume mute button
Volume down button
Volume up button
Turns on the presentation feature.
Mutes or restores volume.
7
8
Decreases tablet PC sound.
Increases tablet PC sound.
Scrolls upward or downward.
9
10
TouchPad scroll zone
Maintenance and Service Guide
1–17
Product Description
Table 1-7
Display Components
Component Function
Item
1
Tablet PC Input Panel
Launch button
Opens the Microsoft Tablet PC Input
Panel application, which includes a
handwriting pad and an on-screen
keyboard.
2
3
4
Rotate button
Q button
Switches the image between landscape
and portrait orientation.
When Windows is running, opens or
closes the Q Menu.
Windows Security
button
When pressed while:
■ Windows is open, enters the
ctrl+alt+delete command.
■ The Setup utility is open, enters the
reset command.
5
Jog dial
Functions like the enter and the up and
down arrow keys on a standard keyboard.
■ Press inward to enter a command.
■ Rotate upward to scroll upward.
■ Rotate downward to scroll downward.
6
7
8
Internal microphone
Pen eject button
Pen holder
Records sound.
Ejects the pen from the pen holder.
Secures the pen to the tablet PC.
Maintenance and Service Guide
1–19
Product Description
Table 1-8
Bottom Components
Function
Item
Component
1
2
Base enclosure cover
Docking connector
Covers the display cable connector.
Connects the tablet PC to an optional
docking device.
3
4
Accessory battery
connector
Connects an optional HP Ultra-Capacity
Battery or HP Extended Life Battery.
Vents (3)
Provides airflow to cool internal
components.
To prevent overheating, do not
Ä
obstruct vents. Use the computer
only a hard, flat surface. Do not
allow a hard surface, such as an
adjoining printer, or a soft
surface, such as pillows or thick
rugs or clothing, to block airflow.
5
6
Battery bay
Holds the battery pack.
Battery release latch
Releases the battery pack from the
battery bay.
7
8
Hard drive cover
Holds the primary hard drive.
Expansion memory
module compartment
Contains one expansion memory
module slot.
Maintenance and Service Guide
1–21
Product Description
1.5 Design Overview
This section presents a design overview of key parts and features
of the tablet PC. Refer to Chapter 3, “Illustrated Parts Catalog,”
to identify replacement parts, and Chapter 5, “Removal and
Replacement Procedures,” for disassembly steps.
The system board provides the following device connections:
■
■
■
■
■
■
■
■
■
■
Audio
Display
Hard drive
Intel Core Duo and Celeron M processors
Keyboard
Memory module
Mini Card WLAN devices
PC Card
Pointing stick
TouchPad
CAUTION: To properly ventilate the tablet PC, allow at least a 7.6-cm
(3-inch) clearance on the left and right sides of the tablet PC.
Ä
The tablet PC uses an electric fan for ventilation. The fan is
controlled by a temperature sensor and is designed to turn on
automatically when high temperature conditions exist. These
conditions are affected by high external temperatures, system
power consumption, power management/battery conservation
configurations, battery fast charging, and software. Exhaust air is
displaced through the ventilation grill located on the left side of
the tablet PC.
1–22
Maintenance and Service Guide
2
Troubleshooting
WARNING: Only authorized technicians trained by HP should repair
this equipment. All troubleshooting and repair procedures are detailed
to allow only subassembly-/module-level repair. Because of the
complexity of the individual boards and subassemblies, do not attempt
to make repairs at the component level or modifications to any printed
wiring board. Improper repairs can create a safety hazard. Any
indication of component replacement or printed wiring board
modification may void any warranty or exchange allowances.
Å
2.1 Computer Setup
Computer Setup is a system information and customization utility
that can be used even when the operating system is not working
or will not load. This utility includes settings that are not
available in Windows.
Using Computer Setup
Information and settings in Computer Setup are accessed from
the File, Security, Diagnostics, or System Configuration menus:
1. Turn on or restart the computer. Press f10 while the
F10 = ROM-Based Setup message is displayed in
the lower-left corner of the screen.
❏ To change the language, use the cursor control keys
to navigate to the System Configuration menu.
❏ To view navigation information, press f1.
❏ To return to the Computer Setup menu, press esc.
Maintenance and Service Guide
2–1
Troubleshooting
2. Select the File, Security, Diagnostics, or
System Configuration menu.
3. To close Computer Setup and restart the computer:
❏ Select File > Save changes and exit, and then press enter.
– or –
❏ Select File > Ignore changes and exit, and then
press enter.
– or –
❏ Select File > Restore defaults, and then press enter.
4. When you are prompted to confirm your action, press f10.
Selecting from the File Menu
Table 2-1
File Menu
Select
To Do This
System Information
■ View identification information about the
computer, processor, memory and cache size,
and system ROM.
■ View BIOS revision, keyboard controller
version, and battery pack serial number
information.
2–2
Maintenance and Service Guide
Troubleshooting
Selecting from the Security Menu
Table 2-2
Security Menu
Select
To Do This
Setup Password
Power-On Password
Password Options
Enter, change, or delete an Setup password.
Enter, change, or delete a power-on password.
Enable/disable:
(Password options can
be selected only when
a power-on password
has been set.)
■ Stringent security.
■ Requirement of password on restart.
DriveLock Passwords
Enable/disable DriveLock; change a DriveLock
user or master password.
DriveLock Settings are accessible only
✎
when you enter Computer Setup by turning
on (not restarting) the computer.
Smart Card Security
Enable/disable smart card power-on support.
A setup password must be established to
use this feature.
✎
TPM Embedded Security
Enable/disable:
■ Embedded security device state.
■ Power-on authentication support.
■ Automatic DriveLock support.
System IDs
Establish:
■ Notebook asset tracking number.
■ Notebook ownership tags.
Disk Sanitizer
Establish fast, optimum, or custom settings for
disk sanitizing.
*Not applicable to SuperDisk LS-120 drives.
Maintenance and Service Guide
2–3
Troubleshooting
Selecting from the Diagnostics Menu
Table 2-3
Diagnostics Menu
Select
To Do This
HDD Self-Test Options
Run a quick comprehensive self test on hard
drives in the system that support the test features.
Memory Check
Run a quick comprehensive test on system
memory on the following categories:
■ Walking 0s
■ Walking 1s
■ High Address line testing
■ Alternate Pattern testing
2–4
Maintenance and Service Guide
Troubleshooting
Selecting from the System Configuration
Menu
Table 2-4
System Configuration Menu
Select
To Do This
Language
Boot Options
Change the Computer Setup language.
Enable/disable MultiBoot, which sets a startup
sequence that can include most bootable devices
and media in the system.
Device Configurations
Enable/disable:
■ Swap Fn/Ctrl keys.
■ USB legacy support.
■ BIOS DMA data transfers.
■ Fan Always on while on AC Power.
■ Data Execution Prevention.
■ LAN Power save.
Built-In Device Options
Enable/disable:
■ Embedded WLAN Device Radio.
■ Embedded Bluetooth Device Radio.
■ LAN/WLAN Switching.
■ Wake on LAN from Off.
Port Options
Enable/disable:
■ USB Port.
■ 1394 Port.
■ CardBus Slot.
Maintenance and Service Guide
2–5
Troubleshooting
2.2 Troubleshooting Flowcharts
Table 2-5
Flowchart Description
2.1
“Flowchart 2.1—Initial Troubleshooting”
2.2
“Flowchart 2.2—No Power, Part 1”
2.3
“Flowchart 2.3—No Power, Part 2”
2.4
“Flowchart 2.4—No Power, Part 3”
2.5
“Flowchart 2.5—No Power, Part 4”
2.6
“Flowchart 2.6—No Video, Part 1”
2.7
“Flowchart 2.7—No Video, Part 2”
2.8
“Flowchart 2.9—No Operating System (OS) Loading”
“Flowchart 2.10—No OS Loading, Hard Drive, Part 1”
“Flowchart 2.11—No OS Loading, Hard Drive, Part 2”
“Flowchart 2.12—No OS Loading, Hard Drive, Part 3”
“Flowchart 2.13—No OS Loading, Diskette Drive”
“Flowchart 2.14—No OS Loading, Optical Drive”
“Flowchart 2.15—No Audio, Part 1”
2.9
2.10
2.11
2.12
2.13
2.14
2.15
2.16
2.17
2.18
2.19
2.20
“Flowchart 2.16—No Audio, Part 2”
“Flowchart 2.17—Nonfunctioning Device”
“Flowchart 2.18—Nonfunctioning Keyboard”
“Flowchart 2.19—Nonfunctioning Pointing Device”
“Flowchart 2.20—No Network/Modem Connection”
2–6
Maintenance and Service Guide
Troubleshooting
Flowchart 2.1—Initial Troubleshooting
Begin
troubleshooting.
N
Go to
Is there
power?
“Flowchart
2.2—No Power,
Part 1.”
Y
N
N
N
N
Check
LED board,
speaker
Beeps,
LEDs, or error
messages?
connections.
Go to
All drives
working?
Y
Y
Y
Y
“Flowchart
2.17—Nonfunc-
tioning Device.”
Y
Y
Y
Go to
“Flowchart
2.6—No Video,
Part 1.”
Is there video?
(no boot)
Go to
“Flowchart
2.18—Nonfunc-
tioning Keyboard”
or “Flowchart
2.19—Nonfunc-
tioning Pointing
Device.”
Keyboard/
pointing
device
working?
Go to
“Flowchart
2.9—NoOperating
System (OS)
Loading.”
Is the OS
loading?
Go to
“Flowchart
2.20—No
Network/Modem
Connection.”
Connecting
to network
or modem?
Go to
“Flowchart
2.15—No Audio,
Part 1.”
Is there
sound?
End
Maintenance and Service Guide
2–7
Troubleshooting
Flowchart 2.2—No Power, Part 1
No power
(power LED
is off).
Remove from
docking device
(if applicable).
N
N
N
Go to
“Flowchart
2.3—No Power,
Part 2.”
Power up
on battery
power?
Power up
on battery
power?
Reset
power.*
Y
Y
N
Y
Y
N
Y
Go to
“Flowchart
2.4—No Power,
Part 3.”
Power up
on AC
Power up
on AC power?
Reset
power.*
power?
Power up in
docking
device?
Done
*NOTES
1. On select tablet PC models, there is a
separate reset button.
2. On select tablet PC models, the computer
can be reset using the standby switch and
either the lid switch or the main power
switch.
1. Reset the power cables in the docking device
and at the AC outlet.
2. Be sure the AC power source is active.
3. Be sure that the power strip is working.
Y
N
Go to
Power up
in docking
device?
“Flowchart
Done
2.8—Nonfunctioning
Docking Device (if
applicable).”
2–8
Maintenance and Service Guide
Troubleshooting
Flowchart 2.3—No Power, Part 2
Continued from
“Flowchart
2.2—No Power,
Part 1.”
Visually check for
debris in battery
socket and clean
if necessary.
Y
Power on?
Done
N
Check battery pack
by
recharging it,
moving it to
another computer,
N
Replace
power supply
(if applicable).
Power on?
Y
N
Go to
“Flowchart
2.4—No Power,
Part 3.”
Done
Power on?
Y
Done
Maintenance and Service Guide
2–9
Troubleshooting
Flowchart 2.4—No Power, Part 3
Continued from
“Flowchart
2.3—No Power,
Part 2.”
Plug directly
into AC outlet.
Y
Power LED
Done
on?
N
Reseat AC adapter
in computer and
at power source.
Y
Power on?
Done
N
Y
External
Internal or
external AC
adapter?
N
Y
Replace external
AC adapter.
Try different
outlet.
Power outlet
active?
Internal
N
Y
Go to
“Flowchart
2.5—No Power,
Part 4.”
Power on?
Done
Replace
power cord.
Power on?
Done
N
2–10
Maintenance and Service Guide
Troubleshooting
Flowchart 2.5—No Power, Part 4
Continued from
“Flowchart
2.4—No Power,
Part 3.”
Open
computer.
Y
Reseat loose
Loose or
damaged
parts?
components and
boards and
replace damaged
items.
N
Close
computer and
retest.
Replace the following items (if applicable). Check
computer operation after each replacement:
1. Internal DC-DC converter*
2. Internal AC adapter
N
3. Processor board*
Power on?
4. System board*
*NOTE: Replace these items as a set to prevent
shorting out among components.
Y
Done
Maintenance and Service Guide
2–11
Troubleshooting
Flowchart 2.6—No Video, Part 1
No video.
Docking Device
Go to
*NOTE: To change from internal to
external display, use the hotkey
combination.
Stand-alone
or docking
device?
“Flowchart
2.7—No Video,
Part 2.”
Stand-alone
Y
Internal or
external
display*?
Adjust
brightness.
Video OK?
Done
N
Internal
External
Press lid
switch to ensure
operation.
A
Adjust
brightness.
Y
Y
Video OK?
Done
Video OK?
Done
|