Compaq Presario CQ42 Notebook PC
and HP G42 Notebook PC
Maintenance and Service Guide
SUMMARY
This guide is a troubleshooting reference used for maintaining and servicing the computer. It provides
comprehensive information on identifying computer features, components, and spare parts;
troubleshooting computer problems; and performing computer disassembly procedures.
Bluetooth is a trademark owned by its
proprietor and used by Hewlett-Packard
Company under license. Intel and Arrandale
are trademarks of Intel Corporation in the
United States and other countries. Microsoft
and Windows are U.S. registered
trademarks of Microsoft Corporation. SD
Logo is a trademark of its proprietor.
The information contained herein is subject
to change without notice. The only
warranties for HP products and services are
set forth in the express warranty statements
accompanying such products and services.
Nothing herein should be construed as
constituting an additional warranty. HP shall
not be liable for technical or editorial errors
or omissions contained herein.
First Edition: April 2010
Document Part Number: 594158-002
Safety warning notice
WARNING!To reduce the possibility of heat-related injuries or of overheating the computer, do not
place the computer directly on your lap or obstruct the computer air vents. Use the computer only on a
hard, flat surface. Do not allow another hard surface, such as an adjoining optional printer, or a soft
surface, such as pillows or rugs or clothing, to block airflow. Also, do not allow the AC adapter to
contact the skin or a soft surface, such as pillows or rugs or clothing, during operation. The computer
and the AC adapter comply with the user-accessible surface temperature limits defined by the
International Standard for Safety of Information Technology Equipment (IEC 60950).
Index ............................................................................................................................... 131
viii
1Product description
CategoryDescriptionHP G42Compaq
Presario
CQ42
UMADiscreteUMA
Product NameCompaq Presario CQ42
Notebook PC
HP G42 Notebook PC√
ProcessorsIntel® Arrandale™
i7-620M, 2.66-GHz, SC turbo, 4-MB
L3 cache
i5-540M, 2.53-GHz, SC turbo, 3-MB
L3 cache
i5-520M, 2.4-GHz, SC turbo, 3-MB
L3 cache
i5-430M 2.26-GHz (turbo to 2.53-
GHz) 3-MB L3 cache
i3-350M, 2.26-GHz 3-MB L3 cache√√√
√√√
√√√
√√√
√√√
√√√
Compaq
Presario
CQ42
Models 150
– 199
Compaq
Presario
CQ42
UMA
Models 100
– 149
i3-330M, 2.13-GHz 3-MB L3 cache√√√
Intel Pentium™
DC T4400, 2.2-GHz, 800-MHz FSB,
1-MB L2 cache
DC T4300, 2.1-GHz, 800-MHz FSB,
1-MB L2 cache
Intel Celeron™
DC T3100, 1.9-GHz, 800-MHz FSB,
1-MB L2 cache
DC T3000, 1.8-GHz 800-MHz FSB,
1-MB L2 cache
AMD® Phenom™ II Processor
DC N930 QC 2.0 GHz√√√
√
√
√
√
1
CategoryDescriptionHP G42Compaq
Presario
CQ42
Compaq
Presario
CQ42
Compaq
Presario
CQ42
UMADiscreteUMA
Models 150
– 199
DC N830 Tri-core 2.1Ghz 1.5M L2
35W
N620 DDR3-1333 Mhz√√√
DC QC P920 1.6Ghz 2M L2 25W√√√
DC P820 Tri-Core 1.8Ghz 1.5M L2
25W
DC P820 Tri-Core 1.8Ghz 1.5M L2
25W
AMD Turion™ II Processor
DC N530 DC 2.5GHz L2 35W√√√
P520 DDR3-1066 Mh√√√
AMD Athlon™ II Processor
DC N330 2.3GHz 1M L2 35W√√√
P320 DDR3-1066 Mhz√√√
√√√
√√√
√√√
UMA
Models 100
– 149
AMD Sempron™ II Processor
N120 DDR3-1066 Mhz√√√
ChipsetIntel® HM55 Express√√√
Intel® GL40√
Southbridge: ICH9m√
AMD
ATI RS880M (Northbridge)√√
ATI RS880MD (Northbridge)√
Southbridge - SB820√√√
GraphicsIntel UMA (integrated)/HD
Graphics with shared video memory
(memory size is dynamic change):
●
Up to 251 MB on computers
with 1024 MB of system memory
●
Up to 358 MB on computers
with more than 2048 MB of
system memory
√√
2Chapter 1 Product description
CategoryDescriptionHP G42Compaq
Presario
CQ42
Compaq
Presario
CQ42
Compaq
Presario
CQ42
Intel UMA (integrated)/GMA
4500M - GL40 chipset with
shared video memory (memory size is
dynamic change):
●
Up to 1759 MB for computers
with more than 4096 MB of
system memory (64 bit)
●
Up to 1309 MB for computers
with more than 4096 MB of
system memory (32 bit)
●
Up to 1309 MB for computers
with more than 3072 MB of
system memory
●
Up to 797 MB for computers
with more than 2048 MB system
memory
●
Up to 285 MB for computers
with more than 1024 MB of
system memory
UMADiscreteUMA
Models 150
– 199
√
Models 100
UMA
– 149
ATi Discrete PCI Express x 16
Graphics
ATi Mobility Radeon Park-LP S3
package (ATI Mobility Radeon™
HD5430 with 512-MB of dedicated
video memory (64-MB×16 DDR3, 4
pcs, 800-MHz))
Support for BD or HD-DVD
playback with HD decoder and
DX10 support
Panel35.6-cm (14.0-in) HD LED
BrightView (1366 x 768 resolution)
16:9 wide aspect ratio√√√√
Memory2 SODIMM slots√√√√
Customer-accessible and upgradable√√√√
Supports up to 8 GB of system
memory
DDR3, 1066-MHz, dual-channel
memory (DDR3 1333 MHz can be
downgraded to DDR3 1066 MHz)
√
√√√√
√√√√
√√√√
√√√
3
CategoryDescriptionHP G42Compaq
Presario
CQ42
Compaq
Presario
CQ42
Compaq
Presario
CQ42
UMADiscreteUMA
Models 150
– 199
DDR3, 800-MHz, dual-channel
memory (DDR3 1333 MHz can be
downgraded to DDR3 800 MHz)
Supports the following configurations:
Hard drivesSupports 9.5-mm, 6.35-cm (2.5-in)
Serial ATA√√√√
Supports the following drives:
●
4096 MB (2048 MB × 2)√√√√
●
3072 MB (1024 MB × 1 +
2048 MB × 1)
●
2048 MB (2048 MB × 1)√√√√
●
2048 MB (1024 MB × 2)√√√√
●
1024 MB (1024 MB × 1)√√√√
hard drives
●
640-GB 5400 RPM√√√
√
√√√√
√√√√
UMA
Models 100
– 149
Optical drivesFixed (removal of one screw required)√√√√
SATA√√√√
12.7-mm (0.50-in) tray load√√√√
Supports the following drives:
Diskette driveSupports external USB drive only√√√√
CameraVGA camera√√√√
●
500 GB, 7200 rpm√√√
●
320 GB, 7200 rpm√√√√
●
250 GB, 7200 rpm√√√√
●
160 GB, 7200 rpm√√√
●
Blu-ray ROM with LightScribe
DVD±R/RW SuperMulti DL Drive
●
Blu-ray ROM DVD±R/RW
SuperMulti DL Drive
●
DVD±R/RW SuperMulti DL Drive
with LightScribe
●
DVD±R/RW SuperMulti DL Drive√√√√
√√√
√√√
√√√√
4Chapter 1 Product description
CategoryDescriptionHP G42Compaq
Presario
CQ42
Compaq
Presario
CQ42
Compaq
Presario
CQ42
UMADiscreteUMA
Models 150
– 199
Fixed (no tilt)√√√√
640 × 480 by 24 frames per second√√√√
MicrophoneOne microphone, analog√√√√
AudioHD audio√√√√
Supports Microsoft Premium
requirements
Altec Lansing speakers√√√√
ModemSupport for optional high-speed 56k
modem
EthernetIntegrated 10/100 network interface
card (NIC)
WirelessIntegrated wireless local area
network (WLAN) options by
way of wireless module:
Intel Centrino Wireless-N 1000
802.11b/g 1x2
√√√√
√√√√
√√√√
√√√
UMA
Models 100
– 149
Intel Centrino Wireless-N 1000
802.11b/g 1x2 plus Broadcom
2070 Bluetooth 2.1+EDR Adapter
Atheros AR9285 802.11b/g/n 1x1
WiFi Adapter
Atheros AR9285 802.11b/g/n 1x1
WiFi Adapter plus Broadcom 2070
Bluetooth 2.1+EDR Adapter
Broadcom 4312G 802.11b/g WiFi
Adapter
Broadcom 4312G 802.11b/g WiFi
Adapter plus Broadcom 2070
Bluetooth 2.1+EDR Adapter
Realtek RTL8191SE 802.11b/g/n
1x1 WiFi Adapter
Realtek RTL8191SE 802.11b/g/n
1x1 WiFi Adapter plus Broadcom
2070 Bluetooth 2.1+EDR Adapter
External media
card
5-in-1 Digital Media Slot; supports
SD, MMC, MS, Mspro, xD
√√√
√√√√
√√√√
√
√
√√√√
√√√√
√√√√
5
CategoryDescriptionHP G42Compaq
Presario
CQ42
Compaq
Presario
CQ42
Compaq
Presario
CQ42
UMADiscreteUMA
Models 150
– 199
Single port configured as either HDMI
or 5-in-1 Digital Media Slot
Supports mini versions of SD, MMC,
and MS Duo with adapter (adapter
not included)
PortsVGA (Dsub 15-pin) supporting 1600
x 1200 resolution at 75 Hz; disabled
when connected to devices through
Expansion port 3
Hot plug/unplug and auto detect for
wide-aspect or standard-aspect video
HDMI v1.3 supporting 1080p with
HDCP key
Single port configured for either
HDMI or 5-in-1 card reader
USB 2.0 (3)√√√√
RJ-11 (modem) with modem option√√√√
√√√
√√√√
√√√√
√√√√
√√√√
√√√
UMA
Models 100
– 149
RJ-45 (Ethernet, with link and activity
lights)
Audio-in (mono microphone)√√√√
Audio-out (stereo headphone)√√√√
Smart-pin AC adapter plug√√√√
Keyboard/
pointing devices
TouchPad with 2 buttons and 2-way
Power
requirements
65-W AC adapter with Smart-Pin DC
90-W AC adapter with Smart-Pin DC
SecuritySecurity cable slot√√√√
Operating
system
14.0-inch keyboard√√√
scroll (taps enabled as default)
6-cell (47-Wh) 2.20-Ah Li-ion battery√√√√
connector
connector
Preinstalled:
√√√√
√√√
√√√
√
Windows 7 Professional (32 & 64 bit)√√√
6Chapter 1 Product description
CategoryDescriptionHP G42Compaq
Presario
CQ42
Compaq
Presario
CQ42
Compaq
Presario
CQ42
UMADiscreteUMA
Models 150
– 199
Windows 7 Home Premium (32 & 64
bit)
Windows 7 Home Basic (32 & 64 bit)√√
Windows 7 Starter (32 bit)√√
Free DOS√√√
Novell Linux√√
ServiceabilityEnd-user replaceable parts:
AC adapter√√√√
Battery (system)√√√√
Hard drive√√√√
Memory module√√√√
Optical drive√√√√
Mini-card device√√√√
√√√
UMA
Models 100
– 149
7
2External component identification
Identifying the hardware
Components included with the computer may vary by region and model. The illustrations in this chapter
identify the standard features on most computer models.
To see a list of hardware installed in the computer, follow these steps:
1.Select Start > My Computer.
2.In the left pane of the System Tasks window, select View system information.
3.Select Hardware tab > Device Manager.
You can also add hardware or modify computer configurations using Device Manager.
8Chapter 2 External component identification
Top components
TouchPad
ComponentDescription
(1)
(2)TouchPad zoneMoves the pointer and selects or activates items on the screen.
(3)Left TouchPad buttonFunctions like the left button on an external mouse.
(4)Right TouchPad buttonFunctions like the right button on an external mouse.
TouchPad off indicatorTo switch the TouchPad zone on and off, quickly double-tap
the TouchPad off indicator.
NOTE: When the TouchPad zone is active, the light is off.
There is an unmarked scroll zone inside the right edge of the TouchPad. To scroll up and down using
the TouchPad vertical scroll zone, slide your finger up or down inside the right edge of the TouchPad.
For more information about TouchPad features, refer to” Using the TouchPad” section later in this guide.
Top components
9
Lights
ComponentDescription
(1) TouchPad light
(2)Caps lock lightOn: Caps lock is on.
(3)
(4)
Power light
Wireless light
●
On: The TouchPad is disabled.
●
Off: The TouchPad is enabled.
●
On: The computer is on.
●
Blinking: The computer is in the Sleep state.
●
Off: The computer is off or in Hibernation.
●
White: An integrated wireless device, such as a
wireless local area network (WLAN) device and/or a
Bluetooth® device, is on.
●
Amber: All wireless devices are off.
10Chapter 2 External component identification
Button and speakers
ComponentDescription
(1) Speakers (2)Produce sound.
(2) Power button
●
When the computer is off, press the button to turn on the
computer.
●
When the computer is on, press the button briefly to
initiate Sleep.
●
When the computer is in the Sleep state, briefly press the
button to exit Sleep.
●
When the computer is in Hibernation, briefly press the
button to exit Hibernation.
If the computer has stopped responding and Windows®
shutdown procedures are ineffective, press and hold the power
button for at least 5 seconds to turn off the computer.
To learn more about your power settings, select Start >
Control Panel > System and Security > Power
Options.
Top components
11
Keys
ComponentDescription
(1)esc keyDisplays system information when pressed in combination with
the fn key.
(2)fn keyDisplays system information when pressed in combination with
the esc key.
(3)
(4)
(5)Navigation keysNavigate using the Up, Down, Left and Right arrow keys.
(6)Action keysExecute frequently used system actions.
Windows logo keyDisplays the Windows Start menu.
Windows applications keyDisplays a shortcut menu for items beneath the pointer.
12Chapter 2 External component identification
Display
ComponentDescription
(1)Internal microphoneRecords sound.
(2)Integrated webcam (select models only)Records audio and video and captures still photographs.
(3)Integrated webcam light (select models only)On: The integrated webcam is in use.
Top components
13
Right-side components
ComponentDescription
(1)Optical driveReads and writes to optical discs.
(2)Optical drive lightBlinking: The optical drive is being accessed.
(3)
(4)RJ-11 (modem) jack (select models only)Connects a modem cable.
(5) AC adapter/power/battery light
(6)
(7)
USB portConnects an optional USB device.
●
White: The computer is connected to external power and
the battery is fully charged.
●
Blinking white: The computer is in the Sleep state.
●
Amber: A battery is charging.
Power connectorConnects an AC adapter.
Security cable slotAttaches an optional security cable to the computer.
NOTE: The security cable is designed to act as a deterrent,
but it may not prevent the computer from being mishandled or
stolen.
14Chapter 2 External component identification
Left-side components
ComponentDescription
(1)
(2)VentEnables airflow to cool internal components.
(3)HDMI port (select models only)Connects an optional video or audio device, such as a high-
(4)
(5)
(6)
(7)
(8)Digital Media Slot (select models only)Supports the following optional digital card formats:
External monitor portConnects an external VGA monitor or projector.
NOTE: The computer fan starts up automatically to cool
internal components and prevent overheating. It is normal for
the internal fan to cycle on and off during routine operation.
definition television, or any compatible digital or audio
component.
RJ-45 (network) jackConnects a network cable.
USB ports (2)Connects optional USB devices.
Audio-in (microphone) jackConnects an optional computer headset microphone, stereo
array microphone, or monaural microphone.
Audio-out (headphone) jackProduces sound when connected to optional powered stereo
speakers, headphones, earbuds, a headset, or television
audio.
●
Memory Stick (MS)
(9)
●
Memory Stick Pro (MSP)
●
MultiMediaCard (MMC)
●
Secure Digital (SD) Memory Card
●
xD-Picture Card (XD)
Drive lightOn: The hard drive is in use.
Left-side components
15
Bottom components
ComponentDescription
(1)Battery bayHolds the battery.
(2)
(3)Vents (4)Enable airflow to cool internal components.
(4)
(5)
Battery release latchReleases the battery from the battery bay.
NOTE: The computer fan starts up automatically to cool
internal components and prevent overheating. It is normal
for the internal fan to cycle on and off during routine
operation.
Memory module compartmentContains 2 memory module slots and, on select models, the
wireless LAN (WLAN) device.
CAUTION: To prevent an unresponsive system, replace
the wireless module only with a wireless module authorized
for use in the computer by the governmental agency that
regulates wireless devices in your country or region. If you
replace the module and then receive a warning message,
remove the module to restore computer functionality, and
then contact technical support through Help and Support.
Hard drive bayHolds the hard drive.
16Chapter 2 External component identification
Wireless antennas
At least 2 antennas send and receive signals from one or more wireless devices. These antennas are
not visible from the outside of the computer.
NOTE:For optimal transmission, keep the areas immediately around the antennas free from
obstructions.
To see wireless regulatory notices, refer to the section of the Regulatory, Safety and EnvironmentalNotices that applies to your country or region. These notices are located in Help and Support.
Wireless antennas
17
Additional hardware components
ComponentDescription
(1)Power cord*Connects an AC adapter to an AC outlet.
(2)AC adapterConverts AC power to DC power.
(3)Battery*Powers the computer when the computer is not plugged into
external power.
*Power cords vary in appearance by country or region.
WARNING!Connecting the internal analog modem to a digital line can permanently damage the
modem. Immediately disconnect the modem cable if you accidentally connect it to a digital line.
NOTE:Telephone jacks vary by country or region. To use the modem and the modem cable
(included with select models only) outside the country or region in which you purchased the computer,
you must obtain a country- or region-specific modem cable adapter (included with select models or
purchased separately). The modem must be connected to an analog telephone line using a 6-pin, RJ-11
modem cable (included with select models only). Jacks for digital PBX systems may resemble analog
telephone jacks, but they are not compatible with the modem.
If the modem cable contains noise suppression circuitry, which prevents interference from TV and radio
reception, orient the circuitry end of the cable toward the computer.
18Chapter 2 External component identification
3Illustrated parts catalog
Serial number location
When ordering parts or requesting information, provide the computer serial number and model number
located in the battery bay of the computer.
Serial number location
19
Computer major components
ItemDescriptionSpare part number
(1)35.6 cm (14-in), WXGA, BrightView display assembly
NOTE: See
internal component spare part information.
●
For use with integrated microphone and webcam; Presario, matte black592146-001
Display assembly components on page 27 for more display assembly
20Chapter 3 Illustrated parts catalog
ItemDescriptionSpare part number
(2)Keyboards
(3)Top cover (includes Touchpad, bracket, button board, and cable)
●
For use with integrated microphone and webcam; Presario, biscotti597617-001
●
For use with integrated microphone and webcam; HP, biscotti600163-001
●
For use with integrated microphone and webcam; HP, silver606155-001
●
For use with integrated microphone and webcam; HP, white606156-001