HP Lp2275w User Guide

							
A Troubleshooting
Solving Common Problems
The following table lists possible problems, the possible cause of each problem, and the recommended
solutions.
ProblemPossible CauseSolution
Screen is blank.Power cord is disconnected.Connect the power cord.
Power button on front panel of the
monitor is turned off.Press the front panel power button.
NOTE: If pressing the power button has no effect, press
and hold the power button for 10 seconds to disable the
power button lockout feature.
Master power switch on rear panel
of the monitor is turned Off.Turn the master power switch to On.
Video cable is improperly
connected.Connect the video cable properly. Refer to Setting Up the
Monitor on page 6  for more information.
Screen blanking is active.Press any key on the keyboard or move the mouse to
inactivate the screen blanking utility.
Image appears blurred,
indistinct, or too dark.Brightness and contrast are too low.Press the  —/Auto button on the front panel. If this does not
correct the image, press the  Menu button to open the OSD
Menu, and adjust the brightness and contrast scales as
needed.
Image is not centeredPosition may need adjustment.Press the  Menu button to access the OSD menu. Select
Image Control/Horizontal Position  or Vertical Position  to
adjust the horizontal or vert ical position of the image.
Check Video Cable is
displayed on screen.Monitor video cable is
disconnected.Connect the appropriate video signal cable between the
computer and monitor. Be sure that the computer power is
off while connecting the video cable.
Input Signal Out of Range.
Change resolution setting
to 1680 × 1050 @ 60Hz  (HP
LP2275w Model) or  Input
Signal Out of Range.
Change resolution setting
to 1920 × 1200 @ 60Hz  (HP
LP2475w Model) is
displayed on screen.Video resolution and/or refresh rate
are set higher than what the monitor
supports.Restart the computer and enter Safe Mode. Change the
settings to a supported setting (see 
Recognizing PresetDisplay Resolutions on page 41 ). Restart the computer
so that the new settings take effect.
HP Display LiteSaver
doesnt turn off the monitor
screen. The Activity Extension time has not
elapsed.
The default Activity Extensi
on value is set to 10 minutes.
The HP Display LiteSaver will wait to detect no input or
movement from the keyboard or mouse for 10 consecutive
minutes after the Display Off time has passed, before the
Solving Common Problems 35
 
						

							
ProblemPossible CauseSolution
monitor enters into low-power mode. For example, if the
Display Off time is set to 5 minutes from the current time
and the Activity Extension is set to 10 minutes, the HP
Display LiteSaver will not act ually turn off the display until
10 minutes of inactivity has elapsed, even though the
Display Off time is 5 minutes from now.
The HP Display LiteSaver may not
be compatible with the computer
system. Some notebook computers
are not compatible and the monitor
power can not be controlled.Confirm that the HP Display LiteSaver is compatible with
the system.
1. Right-click on the  HP Display LiteSaver  icon in the
system tray.
2. Select  Power Off Display  from the menu.
The monitor screen should turn off if the system is
compatible. To turn the monitor back on, wait 5 seconds
and move the mouse.
NOTE: If the monitor did not turn off, then the computer
graphics driver is not compatible with the HP Display
LiteSaver software.
The monitor is off but it did
not seem to enter into a low-
power sleep mode.The monitors power saving control
is disabled.Check the monitors OSD menu setting for power saving
enable/disable controls. The control should be set to
enable to allow the monitor to enter into low-power modes.
OSD Lockout  is displayed.The monitors OSD Lockout
function is enabled.Press and hold the Menu button for 10 seconds to disable
the OSD Lockout function.
Power Button Lockout  is
displayed. The monitors Power Button
Lockout function is enabled. Press and hold the power button for 10 seconds to unlock
the power button function.
36 Appendix A   Troubleshooting
 
						

							
Using the Worldwide Web
For the online access to technical support information, self-solve tools, online assistance, community
forums of IT experts, broad mutlivendor knowledge base, monitoring and diagnostic tools, go to
http://www.hp.com/support
Preparing to Call Technical Support
If you cannot solve a problem using the trouble shooti ng tips in this section, you may need to call
technical support. Have the following information available when you call:
● The monitor
● Monitor model number
● Serial number for the monitor
● Purchase date on invoice
● Conditions under which the problem occurred
● Error messages received
● Hardware configuration
● Hardware and software you are using
Using the Worldwide Web 37
 
						

							
B Technical Specifications
NOTE:All performance specifications  are provided by the component manufacturers. Performance
specifications represent the highest specification  of all HPs component manufacturers typical level
specifications for performance and actual pe rformance may vary either higher or lower.
HP LP2275w Model
Table B-1  HP LP2275w Specifications
Display
Type55.9 cm wide screen
TFT LCD22 inches wide screen
Viewable Image Size55.9 cm diagonal22–inch diagonal
Tilt Adjustment-5 to 30°
Swivel Adjustment-45 to 45°
Height Adjustment100 mm range3.94–inch range
PivotClockwise 
Maximum Weight (Unpacked)8.12 kg17.9 lbs.
Dimensions (include base)
Height (maximum)
Depth
Width
47.8 cm
25.3 cm
50.6 cm18.8 inches
10.0 inches
19.9 inches
Maximum Graphic Resolution1680 x 1050 (60 Hz) analog input
1680 x 1050 (60 Hz) digital input
Optimum Graphic Resolution1680 x 1050 (60Hz) analog input
1680 x 1050 (60Hz) digital input 
Text Mode720 × 400
Dot Pitch0.282 (H) × 0.282 (W) mm
Horizontal Frequency30 to 93 kHz
Vertical Refresh Rate48 to 85 Hz
Environmental Requirements Temperature
Operating Temperature 5 to 35° C
41 to 95° F
38 Appendix B   Technical Specifications
Storage Temperature -20 to 60° C-4 to 140° F
 
						

							
Relative Humidity20 to 80% 
Power Source90 – 265 VAC, 45/63 Hz 
Altitude:
Operating
Storage
0 to 3657.6 m
0 to 12192 m0 to 12,000 feet
0 to 40,000 feet
Power Consumption (maximum)
						

							
Relative Humidity20 to 80% 
Power Source90 – 265 VAC, 45/63 Hz 
Altitude:
Operating
Storage
0 to 3657.6 m
0 to 12192 m0 to 12,000 feet
0 to 40,000 feet
Power Consumption (maximum)
						

							
Recognizing Preset Display Resolutions
The display resolutions listed below are the most commonly used modes and are set as factory defaults.
This monitor automatically  recognizes these preset modes and th ey will appear properly sized and
centered on the screen.
HP LP2275w Model
Table B-3   HP LP2275w Factory Preset Modes
PresetPixel FormatHorz Freq (kHz)Vert Freq (Hz)
1640 × 48031.4759.94
2720 × 40031.4770.08
3800 × 60037.8860.32
4800 × 60046.8875.00
5832 × 62449.7274.55
61024 × 76848.3660.00
71024 × 76860.0275.03
81152 × 87068.6875.06
91152 × 90061.8065.96
101280 × 96060.0060.00
111280 × 102463.9860.02
121280 × 102479.9875.02
131440 x 90055.9459.89
141600 x 100061.64860.00
15 1680 x 1050 65.29 60.00
HP LP2475w Model
Table B-4  HP LP2475w Factory Preset Modes
PresetPixel FormatHorz Freq (kHz)Vert Freq (Hz)
1640 × 48031.4759.94
2640 × 48037.5070.00
3720 × 40031.4770.08
4800 × 60037.8860.32
5800 × 60046.8875.00
6832 × 62449.7274.55
71024 × 76848.3660.00
8 1024 × 768 60.02 75.03
Recognizing Preset Di splay Resolutions 41
 
						

							
PresetPixel FormatHorz Freq (kHz)Vert Freq (Hz)
91024 × 76868.6885.00
101152 × 87068.6875.06
111152 × 90061.8065.96
121280 × 76847.39660.00
131280 × 96060.0060.00
141280 × 102463.9860.02
151280 × 102479.9875.02
161280 × 102491.1585.02
171600 x 100061.64860.00
181600 x 120075.0060.00
191600 x 120093.8075.00
201680 x 105065.2960.00
211920 x 108067.15860.00
221920 x 120074.0460.00
23 1920 x 1200 74.56 60.00
Entering User Modes
The video controller signal may occasionally call for a mode that is not preset if:
●You are not using a standard graphics adapter.
● You are not using a preset mode.
It this occurs, you may need to readjust the parame ters of the monitor screen by using the on-screen
display. Your changes can be made to any or all of these modes and saved in memory. The monitor
automatically stores the new setting, then recogniz es the new mode just as it does a preset mode. In
addition to the factory preset modes, there are fift een to twenty user modes, depending on the model,
that can be entered and stored.
Table B-4   HP LP2475w Factory Preset Modes (continued)
42 Appendix B   Tec hnical Specifications
 
						

							
Energy Saver Feature
When the monitor is in its normal operating mode, the monitor uses less than 95 watts (LP2275w Model)
or 120 watts (LP2475w Model) of power and the Power light is green.
The monitor also supports a reduced power state. The reduced power state will be entered into if the
monitor detects the absence of either the horizontal sync signal and/or the vertical sync signal. Upon
detecting the absence of these signals, the monitor sc reen is blanked, the backlight is turned off, and
the power light is turned amber. W hen the monitor is in the reduced power state,  the monitor will utilize
less than 2 watts of power.  There is a brief warm up period befo re the monitor will return to its normal
operating mode.
Refer to the computer manual for instructions on setting energy saver features (sometimes called power
management features).
NOTE: The above power saver feature only works when  connected to computers that have energy
saver features.
By selecting the settings in the mo nitors Energy Saver utility, you can also program the monitor to enter
into the reduced power state at a predetermined ti me. When the monitors Energy Saver utility causes
the monitor to enter the reduced power state, the power light blinks amber.
Energy Saver Feature 43
 
						

							
C Agency Regulatory Notices
Federal Communications Commission Notice
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant
to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful
interference in a residential installation. This equipment generates, uses, and can radiate radio
frequency energy and, if not installed and used in  accordance with the instructions, may cause harmful
interference to radio communications. However, there  is no guarantee that interference will not occur
in a particular installation. If this equipment d oes cause harmful interference to radio or television
reception, which can be determined by turning the eq uipment off and on, the user is encouraged to try
to correct the interference by one or more of the following measures:
● Reorient or relocate the receiving antenna.
● Increase the separation between the equipment and the receiver.
● Connect the equipment into an outlet on a circui
t different from that to which the receiver is
connected.
● Consult the dealer or an experienced r
adio or television technician for help.
Modifications
The FCC requires the user to be notified that any chan ges or modifications made to this device that are
not expressly approved by Hewlett Packard Compan y may void the users authority to operate the
equipment.
Cables
Connections to this device must be made with sh ielded cables with metallic RFI/EMI connector hoods
to maintain compliance with  FCC Rules and Regulations.
Declaration of Conformity fo r Products Marked with the
FCC Logo (United States Only)
This device complies with Part 15 of the FCC Rules.  Operation is subject to the following two conditions:
1. This device may not cause harmful interference.
2. This device must accept any interference re ceived, including interference that may cause
undesired operation.
For questions regarding the product, contact:
44 Appendix C   Agency Regulatory Notices