Acer Ka272 Lcd Monitor User Guide (+ PDF)

KA272 LCD Monitor
User Guide

Acer LCD Monitor

Contents hide

1 acer KA272 LCD Monitor

2 Information for your safety and comfort

8 Documents / Resources

8.1 References

9 Related Posts

acer KA272 LCD Monitor

Changes may be made periodically to the information in this publication without obligation to notify any person of such revisions or changes. Such changes will be incorporated in new editions of this manual or supplementary documents and publications. This company makes no representations or warranties, either expressed or implied, with respect to the contents hereof and specifically disclaims the implied warranties of merchantability or fitness for a particular purpose.
Record the model number, serial number, purchase date and place of purchase information in the space provided below. The serial number and model number are recorded on the label affixed to your computer. All correspondence concerning your unit should include the serial number, model number and purchase information.
No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronically, mechanically, by photocopy, recording or otherwise, without the prior written permission of Acer Incorporated.

Acer LCD Monitor User Guide
Model number: ______________________
Serial number: ______________________
Date of purchase: ____________________
Place of purchase: ___________________

Acer and the Acer logo are registered trademarks of Acer Incorporated. Other companies’ product names or trademarks are used herein for identification purposes only and belong to their respective companies.

Information for your safety and comfort

Safety instructions
Read these instructions carefully. Keep this document for future reference. Follow all warnings and instructions marked on the product.

Special notes on LCD monitors
The following are normal with the LCD monitor and do not indicate a problem.

Due to the nature of the fluorescent light, the screen may flicker during initial use. Turn off the power switch and then turn it on again to make sure the flicker disappears.
You may find slightly uneven brightness on the screen depending on the desktop pattern you use.
The LCD screen has 99.99% or more effective pixels. It may include blemishes of 0.01% or less such as a missing pixel or pixel lit all the time.
Due to the nature of the LCD screen, an afterimage of the previous screen may remain after switching the image, when the same image is displayed for hours. In this case, the screen is recovered slowly by changing the image or turning off the power switch for a few hours.

Cleaning your monitor
Please carefully follow these guidelines when cleaning the monitor:

Always unplug the monitor before cleaning.
Use a soft cloth to wipe the screen and cabinet front and sides.

Accessibility
Be sure that the power outlet you plug the power cord into is easily accessible and located as close to the equipment operator as possible. When you need to disconnect power from the equipment, be sure to unplug the power cord from the electrical outlet.

Safe listening
To protect your hearing, follow these instructions.

Gradually increase the volume until you can hear it clearly and comfortably and without distortion.
After setting the volume level, do not increase it after your ears have adjusted.
Limit the amount of time listening to music at high volume.
Avoid turning up the volume to block out noisy surroundings.
Turn the volume down if you can’t hear people speaking near you.

Warnings

Do not use this product near water.
Do not place this product on an unstable cart, stand or table. If the product falls, it could be seriously damaged.
Slots and openings are provided for ventilation to ensure reliable operation of the product and to protect it from overheating. These openings must not be blocked or covered. The openings should never be blocked by placing the product on a bed, sofa, rug or other similar surface. This product should never be placed near or over a radiator or heat register, or in a built-in installation unless proper ventilation is provided.
Never push objects of any kind into this product through cabinet slots as they may touch dangerous voltage points or short-out parts that could result in a fire or electric shock. Never spill liquid of any kind onto or into the product.
To avoid damage of internal components and to prevent battery leakage, do not place the product on a vibrating surface.
Never use it under sporting, exercising, or any vibrating environment which will probably cause unexpected short current or damage internal devices.
The adapter is only used for this monitor, do not be used for other purposes.

Using electrical power

This product should be operated from the type of power indicated on the marking label. If you are not sure of the type of power available, consult your dealer or local power company.
Do not allow anything to rest on the power cord. Do not locate this product where people will walk on the cord.
If an extension cord is used with this product, make sure that the total ampere rating of the equipment plugged into the extension cord does not exceed the extension cord ampere rating. Also, make sure that the total rating of all products plugged into the wall outlet does not exceed the fuse rating.
Do not overload a power outlet, strip or receptacle by plugging in too many devices. The overall system load must not exceed 80% of the branch circuit rating. If power strips are used, the load should not exceed 80% of the power strip’s input rating.
This product’s power cord is equipped with a three-wire grounded plug. The plug only fits in a grounded power outlet. Make sure the power outlet is properly grounded before inserting the power cord plug. Do not insert the plug into a non-grounded power outlet. Contact your electrician for details.

Warning! The grounding pin is a safety feature. Using a power outlet that is not properly grounded may result in electric shock and/or injury.
Note: The grounding pin also provides good protection from unexpected noise produced by other nearby electrical devices that may interfere with the performance of this product.

Use the product only with the supplied power supply cord set. If you need to replace the power cord set, make sure that the new power cord meets the following requirements: detachable type, UL listed/CSA certified, type SPT-2, rated 7 A 125 V minimum, VDE approved or its equivalent, 4.6 meters (15 feet) maximum length.

Product servicing
Do not attempt to service this product yourself, as opening or removing covers may expose you to dangerous voltage points or other risks. Refer all servicing to qualified service personnel.
Unplug this product from the wall outlet and refer servicing to qualified service personnel when:

the power cord or plug is damaged, cut or frayed
liquid was spilled into the product
the product was exposed to rain or water
the product has been dropped or the case has been damaged
the product exhibits a distinct change in performance, indicating a need for service
the product does not operate normally after following the operating instructions

Note: Adjust only those controls that are covered by the operating instructions, since improper adjustment of other controls may result in damage and will often require extensive work by a qualified technician to restore the product to normal condition.

Potentially explosive environments
Switch off your device in any area with a potentially explosive atmosphere and obey all signs and instructions. Potentially explosive atmospheres include areas where you would normally be advised to turn off your vehicle engine. Sparks in such areas could cause an explosion or fire resulting in bodily injury or even death. Switch off the device near depots, storage and distribution areas; chemical plants; or where blasting operations are in progress. Areas with a potentially explosive atmosphere are often, but not always, marked. They include below deck on boats, chemical transfer or storage facilities, vehicles using liquefied petroleum gas (such as propane or butane), and areas where the air contains chemicals or particles such as grain, dust or metal powders.

Additional safety information
Your device and its enhancements may contain small parts. Keep them out of the reach of small children.
IT Equipment Recycling Information
Acer is strongly committed to environmental protection and views recycling, in the form of salvaging and disposal of used equipment, as one of the company’s top priorities in minimizing the burden placed on the environment.
We at Acer are very conscious of the environmental effects of our business and strive to identify and provide the best working procedures to reduce the environmental impact of our products.
For more information and help when recycling, please go to this website: http://www.acer-group.com/public/Sustainability/sustainability01.htm
Visit www.acer-group.com for further information on the features and benefits of our other products.

Disposal instructions
Do not throw this electronic device into the trash when discarding. To minimize pollution and ensure utmost protection of the global environment, please recycle. For more information on the Waste from Electrical and Electronics Equipment (WEEE) regulations, visit http://www.acer-group.com/public/Sustainability/sustainability01.htm

LCD pixel statement
The LCD unit is produced with high-precision manufacturing techniques. Nevertheless, some pixels may occasionally misfire or appear as black or red dots. This has no effect on the recorded image and does not constitute a malfunction.
This product has been shipped enabled for power management:

Activate display’s Sleep mode within 5 minutes of user inactivity.
Wake the monitor when it is in Active Off mode, move the mouse or press any keyboard key.

Tips and information for comfortable use
Computer users may complain of eyestrain and headaches after prolonged use. Users are also at risk of physical injury after long hours of working in front of a computer. Long work periods, bad posture, poor work habits, stress, inadequate working conditions, personal health and other factors greatly increase the risk of physical injury.
Incorrect computer usage may lead to carpal tunnel syndrome, tendonitis, tenosynovitis or other musculoskeletal disorders. The following symptoms may appear in the hands, wrists, arms, shoulders, neck or back:

numbness, or a burning or tingling sensation
aching, soreness or tenderness
pain, swelling or throbbing
stiffness or tightness
coldness or weakness

If you have these symptoms, or any other recurring or persistent discomfort and/or pain related to computer use, consult a physician immediately and inform your company’s health and safety department.
The following section provides tips for more comfortable computer use.

Finding your comfort zone
Find your comfort zone by adjusting the viewing angle of the monitor, using a footrest, or raising your sitting height to achieve maximum comfort. Observe the following tips:

refrain from staying too long in one fixed posture
avoid slouching forward and/or leaning backward
stand up and walk around regularly to remove the strain on your leg muscles

Taking care of your vision
Long viewing hours, wearing incorrect glasses or contact lenses, glare, excessive room lighting, poorly focused screens, very small typefaces and low-contrast displays could stress your eyes. The following sections provide suggestions on how to reduce eyestrain.
Eyes

Rest your eyes frequently.
Give your eyes regular breaks by looking away from the monitor and focusing on a instant point.
Blink frequently to keep your eyes from drying out.

Display

Keep your display clean.
Keep your head at a higher level than the top edge of the display so your eyes point downward when looking at the middle of the display.
Adjust the display brightness and/or contrast to a comfortable level for enhanced text readability and graphics clarity.
Eliminate glare and reflections by:
placing your display in such a way that the side faces the window or any light source
minimizing room light by using drapes, shades or blinds
using a task light
changing the display’s viewing angle
using a glare-reduction filter
using a display visor, such as a piece of cardboard extended from the display’s top front edge
Avoid adjusting your display to an awkward viewing angle.
Avoid looking at bright light sources, such as open windows, for extended periods of time.

Developing good work habits
Develop the following work habits to make your computer use more relaxing and productive:
• Take short breaks regularly and often.
• Perform some stretching exercises.
• Breathe fresh air as often as possible.
• Exercise regularly and maintain a healthy body.

Declaration of Conformity
We, Acer Incorporated
8F, 88, Sec. 1, Pintail 5th Rd., Xizhi, New Taipei City 221
And,
Acer Italy seral.
Viale delle Industrie 1/A, 20044 Arese (MI), Italy
Tel: +39-02-939-921 ,Fax: +39-02 9399-2913 www.acer.it
Product: LCD Monitor
Trade Name: Acer
Model Number: KA272
SKU Number: KA272 xxxxxx; = 0-9, a — z, A — 7,, or blank)
We, Acer Incorporated, hereby declare under our sole responsibility that the product described above is in conformity with the relevant Union harmonization legislations as below Directive and following harmonized standards and/or other relevant standards have been applied:
SEMC Directive: 2014/30/EU
N EN 55032:2015+A 1 1:2020 Class B 12] EN EN IEC 61000-3-2:2019 Class D
IN EN 55035:2017+A 1 1:2020 N EN EN61000-3-3:2013+A1: 2019
LVD Directive: 2014/35/EU
N EN 62368-1: 2014+A11:2017
181 RoHS Directive: 2011/65/EU
N EN IEC 63000: 2018
181ErP Directive: 2009/125/EC
N (EU) 2019/ 2021; EN 50564:2011
Year to begin affixing CE marking: 2022.

RU Jan / Sr. Manager Acer Incorporated (New Taipei City)
Feb.24, 2022
Date

Federal Communications Commission Supplier’s Declaration of Conformity

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, and (2) this device must accept any interference received, including interference that may cause undesired operation.
The following local Manufacturer /Importer is responsible for this declaration:

Product:	LCD Monitor
Model Number:	KA272
SKU Number:	(“x” = 0~9, a ~ z, or A ~ Z)
Name of Responsible Party:	Acer America Corporation
Address of Responsible Party:	333 West San Carlos St. Suite 1500 San Jose, CA 95110 U. S. A.
Contact Person:	Acer Representative
Phone No.:	254-298-4000
Fax No.:	254-298-4147

Unpacking

Please check that the following items are present when you unpack the box, and save the packing materials in case you need to ship or transport the monitor in the future.

Attaching/removing the base

Installation: Align the base with the stand and push the base towards the top of the monitor, and then rotate the base clockwise. Tighten the screw clockwise.
Remove:

Reverse the steps to remove the base.
Use a screwdriver to press the shrapnel of back cover to remove the stand at the same time.

Note: Take care when performing the installation to avoid injuring yourself.
If installing with a wall mounting kit, install 2 extension columns into the copper stud in the back cover (as below picture), it is recommended to use VESA mounting kit (100 x 100) with M4 x 10(L) mm screws to fix your monitor on the wall.

Screen position adjustment
In odder to optimize the best viewing position, you can adjust the height/tilt of the monitor.

Tilt

Please see the illustration below for an example of the tilt range.
Only at the highest point can 15 degrees of recline be offered for the angle of elevation.

Connecting the AC Power cord

Check first to make sure that the power cord you use is the correct type required for your area.
The monitor has a universal power supply that allows operation in either 100/120 V AC or 220/240 V AC voltage area. No user-adjustment is required.
Plug one end of the AC power cord to the Adapter, and plug the other end into an AC outlet.
For units using 120 V AC: Use a UL-listed cord set, type SVT wire and plug rated 10 A/125 V.
For units using 220/240 V AC:
Use a cord set consisting of H05VV-F cord and plug rated 10 A/250 V. The cord set should have the appropriate safety approvals for the country in which the equipment will be installed.

Power saving
The monitor will be driven into “Power Saving” mode by the control signal from the display controller, as indicated by the amber-color power LED.

State	LED Light
ON	Blue
Power Saving Mode	Amber

The power saving states will be kept until a control signal has been detected or the keyboard or mouse is activated. The recovery time from Active OFF state back to ON state is around 3 seconds.

Display Data Channel (DDC)
To make installation easier, so long as your system supports the DDC protocol, the monitor is able to plug-and-play. The DDC is a communication protocol through which the monitor automatically informs the host system about its capabilities; for example, supported resolutions and corresponding timing. The monitor supports the DDC2B standard.

19-pin color display signal cable

PIN No.	Description
1	TMDS data 2+
2	TMDS data 2 shield
3	TMDS data 2-
4	TMDS data 1+
5	TMDS data 1 shield
6	TMDS data 1-
7	TMDS data 0+
8	TMDS data 0 shield
9	TMDS data 0-
10	TMDS clock+
11	TMDS clock shield
12	TMDS clock-
13	CEC
14	DDC-serial data
15	SCL
16	SDA
17	DDC/CEC Ground
18	+5V Power
19	Hot Plug Detect

20-pin color display signal cable

PIN No.	Description
1	Lane0 (p)
2	GND
3	Lane0 (n)
4	Lane1 (p)
5	GND
6	Lane1 (n)
7	Lane2 (p)
8	GND
9	Lane3 (n)
10	Lane3 (p)
11	GND
12	Lane3(n)
13	Config1
14	Config2
15	AUX_CH (n)
16	GND
17	AUX_CH (p)
18	Hot Plug Detect
19	DP Power Return
20	DP Power

Standard timing table

Mode		Resolution
1	VGA	640 × 480	60	60
2	VGA	640 × 480	72	72
3	VGA	640 × 480	75	75
4	SVGA	800 × 600	56	56
5	SVGA	800 × 600	60	60
6	SVGA	800 × 600	72	72
7	SVGA	800 × 600	75	75
8	XGA	1024 × 768	60	60
9	XGA	1024 × 768	70	70
10	XGA	1024 × 768	75	75
11	VESA	1152 × 864	75	75
12	VESA	1280 × 960	60	60
13	SXGA	1280 × 1024	60	60
14	VESA	1360 × 768	60	60
15	WXGA+	1400 × 900	60	60
16	WSXGA+	1680 × 1050	60	60
17	FHD	1920 × 1080	60	60
18	FHD	1920 × 1080	75	75
19	FHD	1920 × 1080	85	85
20	FHD	1920 × 1080	100	100

Installation

Turn off your computer and unplug your computer’s power cord.
Connect the HDMI Cable (Only HDMI-Input Model)
(1) Make sure both the monitor and computer are switched off.
(2) Connect one end of the 19-pin HDMI cable to the back of the monitor and the other end to the computer’s port. Connect the DP cable (only for DP models).
(1) Make sure both the monitor and computer are switched off.
(2) Connect one end of the 20-pin DP cable to the back of the monitor and the other end to the computer’s port.
Insert the monitor power cable into the power port at the back of the monitor.
Connect the power cord to the monitor, then to a properly grounded AC outlet.

User Controls

External controls

Power button	Turns the monitor on/off. Blue indicates power on. Amber indicates standby/ power saving mode.
Function key	a. Press to view Main page. Press again to enter hotkey 1 function. b. When the Function Menu is active, press this key to view the basic information for your monitor and current input or reset the custom color settings to the factory defaults.
Function key	a. Press to view Main page. Press again to enter hotkey 2 function. b. When the Function Menu is active, press this button to select select scenario mode or game mode .
Function key	a. Press to view Main page. Press again to enter Input select function. b. When the Function Menu is active, this button will quit the OSD.
Function key	a. Press to view Main page.Press again to enter next function in the Function Menu. b. The single toggle button on the backside of the Display bezel operates like a joystick. To move the cursor, simply toggle the button in four directions. Press the button to select desired option. Bright gray indicates operable. Dark gray indicates inoperable.

FreeSync (HDMI):
It can allow a FreeSync supported graphics source to dynamically adjust display refresh rate based on typical content frame rates for power efficient, virtually stutter free and low-latency display update.

Using the Shortcut Menu
Note: The following content is for general reference only. Actual product specifications may vary.
The OSD (onscreen display) can be used to adjust the settings of your LCD monitor. Press the MENU key to open the OSD. You can use the OSD to adjust the picture quality, OSD position and general settings. For advanced settings, please refer to following page:

Main page

Hot Key 1
Modes, Brightness, Volume, Gamma, Contrast, Blue Light, Over Drive, VRB
Hot Key 2
Modes, Brightness, Contrast, Volume, Gamma, Blue Light, Over Drive, VRB
Hot Key 3
Input Switch Hot Key
Main Menu

Hot key 1 (default: Standard mode)
To choose scenario mode (sRGB, Reading, Darkroom, User, Standard, ECO, Graphics, Movie)

Hot key 2 (default: Brightness)
Open the Brightness control and select your preferred brightness setting. When you are done, press the joystick to quit current page and store.

Selecting the input
Open the Input control and select HDMI,DP or Auto Source. When you are done, press the joystick to exit current page and store.

Main menu

Press the MENU key to open the OSD.
Toggle the joystick to the up▲ or down▼ to select Picture from the OSD. The toggle to the right to navigate to the element you wish to adjust and press the joystick to enter it.
Toggle the joystick to the left◀ or right▶ to adjust the sliding scales.

Information Hot Key: Show Monitor Information and Reset control function.
Modes Hot Key: To change Modes Hot Key menu.
Exit Hot Key : To exit current page and store.

Picture

Press the MENU key to open the OSD.
Toggle the joystick to the up or down to select Picture from the OSD. Then toggle to the right to navigate to the element you wish to adjust and press the joystick to enter it.
Toggle to the left or right to adjust the sliding scales.
The Picture menu can be used to adjust the Brightness, Contrast, Black Boost, Blue Light, ACM, Super Sharpness.
Brightness: Adjust the brightness from 0 to 100.
Note: Adjusts the balance between light and dark shades.
Contrast: Adjust the contrast from 0 to 100.
Note: Sets the degree of difference between light and dark areas.
Black Boost: Adjust the black level from 0 to 10. Enhances shadows by increasing the brightness without changing lighter shades.
Low Blue Light: Filters out blue light to protect your eyes by adjusting how much blue light is shown — 80%, 70%, 60%, or 50%.
Note: A higher value allows more blue light to pass through, so in order to achieve the best protection, please select a lower value, of which 50% is in the best state and has been tested by TÜV Rheinland and meet the requirements of TÜV Rheinland’s “Low Blue Light Content” standard.
ACM: Turn ACM on or off.
Note: Set to “On”, will be based on the current screen to dynamic contrast adjustment.
Super Sharpness: Turn the Super Sharpness On or Off. Super Sharpness technology can simulate high-resolution images by boosting the pixel density of the original source to make images sharper and clearer.

Color

Press the MENU key to open the OSD.
Toggle the joystick to the up or down to select Color from the OSD. Then toggle to the right to navigate to the element you wish to adjust and press the joystick to enter it.
Toggle to the left or right to adjust the sliding scales.
Gamma mode allows you to adjust the luminance tone. The default value is 2.2 (standard value for Windows).
Color temp.: Default is warm. You can choose Cool, Normal, Warm, Bluelight or User.
Modes: To choose scenario mode.
sRGB Mode: Default is off. You can turn sRGB on or off to better color match with peripheral devices, such as printers and digital cameras.
Grayscale Mode: To choose Grayscale mode.
6-axis Hue: Adjust the red, green, blue, yellow, magenta and cyan hue.
6-axis Saturate: Adjust the red, green, blue, yellow, magenta and cyan saturation.

Audio

Press the MENU key to open the OSD.
Toggle the joystick to the up or down to select Audio from the OSD. Then toggle to the right to navigate to the element you wish to adjust and press the joystick to enter it.
Toggle to the left or right to adjust the sliding scales.
Volume: Adjust the volume
Mute: To choose mute on/off.

Performance

Press the MENU key to open the OSD.
Toggle the joystick to the up or down to select Gaming from the OSD. Then toggle to the right to navigate to the element you wish to adjust and press the joystick to enter it.
Toggle to the left or right to control functions.
Over Drive: Select Off, Normal or Extreme.
Freesync: To choose Freesync on/off.
VRB: To choose VRB on/off.
Refresh rate num: Display the panel’s current refresh rate on the screen.
Note: If FreeSync set “On” you can see the V Frequency to changes in the OSD.

OSD

Press the MENU key to open the OSD.
Toggle the joystick to the up or down to select OSD from the OSD. Then toggle to the right to navigate to the element you wish to adjust and press the joystick to enter it.
Toggle to the left or right to adjust the sliding scales.
Language: Set the OSD menu language.
OSD timeout: Adjust the delay before turning off the OSD menu.
Transparency: Select the transparency when using gaming mode. The transparency can be 0% (OFF), 20%, 40%, 60%, or 80%.
OSD Lock: To choose OSD lock on/off.

Note:
OSD Locked:

Set the OSD Lock to “On” by the OSD option and press “Enter” to execute the All Key lock function.
The “OSD Locked” message will be displayed in the middle of the screen.
LED lights will be changed from blue light to orange light.
Press any Key screen to prompt “OSD Locked” message.

OSD Unlocked:

In normal display condition to press the “Navi Key” in the middle of more than 3 seconds to trigger “OSD Unlock”.
The “OSD Unlock” message will be displayed in the middle of the screen.
LED lights will be restored to blue light.

System

Press the MENU key to open the OSD.
Toggle the joystick to the up or down to select System from the OSD. Then toggle to the right to navigate to the element you wish to adjust and press the joystick to enter it.
Toggle to the left or right to control functions.
Input: Select the source from HDMI,DP.
Auto Source: The default is “On”, which can support auto search for signal source in order.
Note: Surround application must set Auto Source is “Off”.
Wide mode: You can select which screen aspect you are using. The options are Aspect and Full.
Hot Key Assigment: Select the function of shortcut key 1 (Modes, Volume, Brightness, Gamma, Contrast, Blue Light, Over Drive) and shortcut keys 2 (Modes, Volume, Brightness, Gamma, Contrast, Blue Light, Over Drive).
DDC/CI: Allows the monitor settings to be set through the software on the PC.
Note: DDC/CI, short for Display Data Channel/Command Interface, which allows monitor controls to be sent via software.
HDMI Black level: Select to set HDMI black level.
Quick start mode: Select Off or On. Turn on to speed up boot speed.

Save Setting to… (User mode only)

Press the MENU key to open the OSD.
Toggle the joystick to the up or down to select “Save Setting to…” from the OSD. Then toggle to the right to navigate to the element you wish to adjust and press the joystick to enter it.
Save Setting to Game mode: There are three user-defined profiles available. When you have decided what settings suit you, save them and system will be able to recall the settings in the future when you turn on gaming mode.

Troubleshooting

Before sending your LCD monitor for servicing, please check the troubleshooting list below to see if you can self-diagnose the problem.

DP/HDMI1.4 Mode (Optional)

Problem	LED status	Remedy
No picture visible	Blue	Using the OSD, adjust brightness and contrast to maximum or reset to their default settings.
	Off	Check the power switch. Check if the power cord is properly connected to the monitor.
	Orange	Check if the video signal cable is properly connected at the back of monitor. Check if the computer system is switched on and in power saving/standby mode.
Unstable picture		Check if the specification of graphics adapter and monitor is in compliance which may be causing the input signal frequency mismatch.
Abnormal picture	Image is missing, off-center, too large or too small on the screen.	Check the display setting on your system. In case of a missing image, please select another resolution or vertical refresh rate. Wait for a few seconds after adjusting the size of the image before changing or disconnecting the signal cable or switching off the monitor.