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Input Signal Out

of Range is

displayed on

screen.

Video resolution and/or refresh rate are set

higher than what the monitor supports.

Change the settings to a

supported setting.

The monitor is

off, but it did not

seem to enter

into Sleep mode.

The monitor’s power saving control is

disabled.

Open the OSD menu and

select Power Control > Auto-

Sleep Mode and set auto-sleep

to On.

On-Screen

Menus are

Locked is

displayed.

The monitor’s OSD lock function is enabled.

Press and hold the Menu

button on the front bezel to 10

seconds to disable the OSD

lockout function.

Power Button is

Locked is

Displayed

The monitor’s power button is locked.

Press and hold the power

button for 10 seconds to

disable the power button lock

function.

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HP U28 Specifications

General

Color depth	8 bit
Pixel pitch	0.116 x 0.116 mm
Screen shape	Flat
Pixel density	157 ppi
Display diagonal	28 \
Surface hardness	3H
Display technology	LCD
Native aspect ratio	16:9
Vertical scan range	30 - 60 Hz
Maximum refresh rate	60 Hz
Horizontal scan range	27 - 136 kHz
Display number of colors	-
Display brightness (typical)	400 cd/m²
Supported graphics resolutions	640 x 480 (VGA), 720 x 400, 800 x 600 (SVGA), 1024 x 768 (XGA), 1280 x 1024 (SXGA), 1440 x 900 (WXGA+), 1440 x 900, 1600 x 900, 1920 x 1080 (HD 1080), 2560 x 1440, 3840 x 2160
Pivot angle	-90 - 90 °
Tilt angle range	-5 - 23 °
Panel mounting interface	100 x 100 mm
USB hub version	3.2 Gen 1 (3.1 Gen 1)
DisplayPort version	1.2
USB Power Delivery up to	65 W
USB Type-A downstream ports quantity	3
HP segment	Home
Package depth	165 mm
Package width	824 mm
Package height	470 mm
Package weight	10450 g
Operating temperature (T-T)	5 - 35 °C
Operating relative humidity (H-H)	20 - 80 %
AC input voltage	100 - 240 V
AC input frequency	50 - 60 Hz
Power consumption (max)	155 W
Power consumption (standby)	0.5 W
Power consumption (typical)	45 W
Certification	MEPS; BSMI; CB; CCC; CE; CECP; CEL; EAC; ENERGY STAR®; FCC; ISO 9241-307; KC/KCC; NOM; PSB; SEPA; TCO Certified; TUV-S; UL/CSA; VCCI; Vietnam MEPS; WEEE; ISC; WW application; ICE
Product color	Silver
Country of origin	China
Sustainability certificates	CE, ENERGY STAR, TCO

Weight and Dimensions