Mitsubishi Electric Mdt421s Users Manual

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ADVANCED OPTION
Main-Menu
INPUT RESOLUTION     * : INPUT RGB3, 4, 5 only
Selects to decision of input signal about below timings, 1024x768, 1280x768 and 1360x768.
AUTO: Determines the resolution automatically.
1024x768: Determines the resolution as 1024x768
1280x768: Determines the resolution as 1280x768
1360x768: Determines the resolution as 1360x768
The setting you select becomes effective when POWER is turned OFF and ON again.
BLACK LEVEL EXPANSION     * : INPUT RGB1 (HDMI INPUT MODE: HDMI-HD), RGB2 (DVI INPUT MODE: DVI-HD), DVD/HD, VIDEO, VIDEO only
Selects a level of black expansion from “OFF”, “MIDDLE” and “HIGH.”
In case of go under the black cut-off level, please adjust the “Black level” in moderation on OSD menu.
SCAN MODE     * : INPUT RGB1 (HDMI INPUT MODE: HDMI-HD), RGB2 (DVI INPUT MODE: DVI-HD), DVD/HD, VIDEO, VIDEO only
Changes the display area of the image.
OVERSCAN: Set to display area about 95%
UNDERSCAN: Set to display area about 100%
NOTE: When the PIP function is activated, SCAN MODE is forcefully set to OVERSCAN.  
SCAN CONVERSION     * : INPUT RGB1 (HDMI INPUT MODE: HDMI-HD), RGB2 (DVI INPUT MODE: DVI-HD), DVD/HD, VIDEO, VIDEO only
Selects IP (Interlace to Progressive) converter function.  
PROGRESSIVE: Enable the IP function, to convert interlace signal to progressive. Normally use this setting.
INTERLACE: Disable the IP function.
FILM MODE
Selects Film mode function.
AUTO: Enable the Film mode function. This mode is better suited for movies, which is converted 24 Frames/sec source 
to DVD Video. We recommend to select “PROGRESSIVE” in “SCAN CONVERSION”.
OFF: Disable the Film mode function. This mode is better suited for Broadcasting or VCR source.
NOTE: When FILM MODE is AUTO, set SCAN CONVERSION to PROGRESSIVE. 
IR CONTROL
Selects the operation mode of the wireless remote controller when multiple MDT421S monitors are connected via RS-232C. 
Select from the following four modes using the      or      button and then accept the selected mode by pressing the SET button.
NORMAL: The monitor will be controlled normally by wireless remote controller.
PRIMARY: The first MDT421S monitor of those multi-connected via RS-232C is designated as PRIMARY. 
SECONDARY: MDT421S monitors other than the first one multi-connected via RS-232C are designated as SECONDARY. 
LOCK: Disable the monitor control by infrared wireless remote controller.
Keep pressing “DISPLAY” button during 5 sec or more, this setting will return to “NORMAL”.
TILING
TILING demonstrates multiple screens. This feature provides a single large screen using up to 25 monitors.  
It will be able to divide up to 5 each H and V.  
This requires you to feed the PC output into each of the monitors through a distributor.
H MONITORS: Select number of horizontal divide.
V MONITORS: Select number of vertical divide.
POSITION: Select a position to expand the screen.
FRAME COMP.: Works in tandem with TILING to compensate for the width of the tile bezels in order to accurately 
display the image.
ENABLE: Select “YES”, the monitor will expand the selected position. 
PIP and STILL will be disabled when “TILING” is activated.
Continued on next page.
 
						

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HEAT STATUS
Information of status for COOLING FAN, BRIGHTNESS and TEMPERATURE.
COOLING FAN comes to run when inside temperature is over a guaranteed limit.
In this case warning is displayed on the screen.
POWER ON DELAY
Adjusts the delay time from “standby” to “power on” mode.
“POWER ON DELAY” time is selectable from 0-50 seconds.
DATE AND TIME
Adjusts the current date and time for internal clock.
You should set this function when you use “SCHEDULE”.
SCHEDULE
Programs the monitors working schedule.
Schedule the power on and power off with hour and a day of the week. Also sets the input port.
This OSD cant remove except EXIT.
(See “HOW TO SETUP SCHEDULE” on page 32.)
HDMI INPUT MODE
Select “HDMI-PC” when PC or other computer equipment is connected via HDMI.
Select “HDMI-HD” when DVD player, which has HDMI output, is connected via HDMI.
DVI INPUT MODE
Select “DVI-PC” when PC or other computer equipment is connected via DVI-D.
Select “DVI-HD” when DVD player, which has HDMI output, is connected via DVI-D.
MONITOR ID
ID numbers for remote control are assigned to MDT421S monitors that are multi-connected via RS-232C. 
ID numbers 1 to 26 are selectable. 
DDC/CI
Use to turn ON or OFF the DDC/CI communication function. Select ON for normal use. 
SYNC TYPE     * : INPUT RGB3, 4 only
Select “0.3V” for 0.3 Composite Sync.
Select  
“TTL” for TTL Sync. 
ADVANCED OPTION RESET
Selecting ADVANCED OPTION RESET allows you to reset all OSD settings from ADVANCED OPTION settings, 
except for DATE AND TIME, SCHEDULE, HDMI INPUT MODE, DVI INPUT MODE, MONITOR ID, and DDC/CI.
Select “YES” and press “SET” button to restore the factory preset data.
Press “EXIT” button to cancel and then return the previous menu. Continued from previous page.
 
						

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NOTE
< IMAGE PERSISTENCE >
Please be aware that LCD Technology may experience a phenomenon known as Image Persistence. Image Persistence 
occurs
 when residual or “ghost” image of a previous image remains visible on the screen. Unlike CRT monitors, LCD 
monitors’ image persistence is not permanent, but constant images being displayed for a long period of time should be 
avoided.
To alleviate image persistence, turn off the monitor for as long as the previous image was displayed. For example, if an 
image was on the monitor for one hour and a residual image remains, the monitor should be turned off for one hour to erase 
the image.
As with all personal display devices, MITSUBISHI ELECTRIC recommends displaying moving images and using a moving 
screen saver at regular intervals whenever the screen is idle or turning off the monitor when not in use.
Please set “POWER SAVE”, “SCREEN SAVER”, “DATE AND TIME” and “SCHEDULE” functions to further reduce the risk of 
Image persistence.
< For long life use of Public Display >
Image Sticking of LCD Panel 
When LCD panel is operated continuously for long hours, a trace of electric charge remains near the electrode inside LCD, and 
residual or “ghost” image of previous image may be observed. (Image Persistence)
Image Persistence is not permanent, but when a fi xed image is displayed for a long period, ionic impurities inside LCD are 
accumulated along the displayed image, and it is observed permanently. (Image Sticking)
Recommendations
For preventing the fast transition to Image Sticking, and for longer life usage of LCD, the following are recommended.
1.   Fixed images should not be displayed for long periods of time, and changed to another images with short cycle.
2.   When the monitor is not in use, please turn it off using the remote control, use the Power Management Function or use the 
Schedule Function.
3.   Reducing the environmental temperature is effective for long life use.
  When a Protection board (glass, acrylic) is installed over the LCD surface, enclosed into the box / wall, or the monitors are 
stacked, please utilize the temperature sensors inside monitor.
  To reduce the environmental temperature, the monitor should be set Low Brightness or Cooling Fan “ON” by using the 
Screen saver Function.
4.   Please use “Screen Saver Mode” of monitor.
< HOW TO SETUP SCHEDULE >
Using the “SCHEDULE” function allows you to set up to seven different scheduled time intervals when the LCD Monitor will be 
activated.
You can select the time the monitor turns on and turns off, the day of week the monitor is activated, and which input source the 
monitor will use for each scheduled activation period. A check mark in the box next to the number of the schedule 
indicates that the selected schedule is in effect.
To select which schedule to set, use the up/down arrows to move the number (1 to 7) of the schedule.
Use the (+) and (-) buttons to move the cursor horizontally within the particular schedule. Use the (
) and () buttons to 
increase time and select input port. The “SET” button is used to make a selection.
If you create a schedule but do not want to use a power on time, select “--” in the “ON” time slot.
If you do not want to use a power off time select “--” in the OFF time slot.
If there is no input selected (“--” showing in the input spot) the input from the previous schedule will be used.
The selection of EVERY DAY within a schedule takes priority over other schedules that are set up to operate weekly.
When schedules are overlapping, scheduled Power ON time has priority over scheduled Power OFF time.
If there are two schedules programmed for the same time, then the highest numbered schedule has priority.
When the “OFF TIMER” (see page 29) is set, the “SCHEDULE” function is disabled.
 
						

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< PIP, POP and SIDE BY SIDE >
The following table shows the combination of signal inputs under which the “PIP” and “POP” modes function. These modes do 
not function, however, when the screen size is “CUSTOM” or “REAL”.
< Supplemental information of the auto brightness function >
To control multiple monitors collectively
In such a case where the tiling function is used, you can control the auto brightness function by sharing the detection result of 
the brightness sensor of a certain monitor among the connected monitors. 
1.  Multi-connect the monitors using RS-232C or CAT5 cables separately sold as shown by the example below.  
Monitor
ID = 9
(Slave)Monitor
ID = 8
(Slave)Monitor
ID = 7
(Slave)
Monitor
ID = 6
(Slave)Monitor
ID = 5
(Slave)Monitor
ID = 4
(Slave)
Monitor
ID = 3
(Slave)Monitor
ID = 2
(Slave)Monitor
ID = 1
(Master)Master:  Monitor configured as Master that detects 
the outside light (Monitor ID is “1”.)
Slave:  Monitor controlled by the Master monitor
  (Monitor ID is other than “1”.) 
2.  Assign a monitor ID to each multi-connected MDT421S using MONITOR ID. (See page 31.)
  Monitor ID is selectable from 1 to 26. 
  The monitor ID of the Master monitor should be “1” and those of the Slave monitors should be other than “1”. 
  You are recommended to assign IDs to the monitors consecutively from 1, 2, 3, and on. 
3.  Set AUTO BRIGHTNESS on the OSD screen (PICTURE) as follows. 
LOCAL
REMOTEPRIMARY
SECONDARY Master monitor
Slave monitorsAUTO BRIGHTNESS CONTROL
RGB1
(HDMI)
RGB1 (HDMI)
RGB2 (DVI-D)
RGB3 (D-SUB)
RGB4 (BNC)
RGB5* (CAT5)
RGB6 (
DISPLAY PORT)
DVD/HD (YPbPr)
VIDEO
VIDEORGB2
(DVI-D)RGB3
(D-SUB)
RGB4
(BNC)RGB5*
(CAT5)RGB6
(              )DISPLAY
PORTDVD/HD
(YPbPr)VIDEOVIDEOSUB
MAIN
: Supported
: Not supported
PIP SIZE
SMALL
MIDDLE
LARGE: 450 pixels X 338 pixels
: 675 pixels X 450 pixels 
: 900 pixels X 675 pixels
: 450 pixels X 338 pixels POP SIZE “PIP”, “POP” mode resolution (Reference) Press the “PIP ON/OFF” buttons on the remote control to change between “PIP”, “POP” and “SIDE BY SIDE” 
mode as shown in the diagram below.
PIP POP OFFSIDE BY SIDE
ASPECTSIDE BY SIDE
FULL
* : RGB 5 becomes usable when the optional CAT5 Rx BOX is mounted.  
 
						

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To use a computer to control the monitors
When using a computer to control the monitors, you must prepare an application software program for control by yourself. 
1.  Connect the RS-232C IN connector of the Master monitor shown above and the RS-232C connector of the computer using 
an RS-232C cable. 
  Or, using a CAT5 cable, connect the RS-232C connector of the computer to the CAT5 IN connector of the Master monitor via 
the CAT5 Tx BOX. 
2.  Assign a monitor ID to each multi-connected MDT421S using MONITOR ID. (See step 2 on page 33.) 
3.  Set AUTO BRIGHTNESS on the OSD screen (PICTURE) as follows. 
 
REMOTE
REMOTESECONDARY
SECONDARY Master monitor
Slave monitorsAUTO BRIGHTNESS CONTROL
4.  For the specifi cations of the communication commands, contact your dealer. 
< Remote control numbering function >
By connecting multiple MDT421S monitors using RS-232C cables, you can control any one monitor or all the monitors by one 
remote controller. 
1.   Assign arbitrary ID number to each of multi-connected MDT421S monitors using MONITOR ID. 
  ID numbers 1 to 26 are selectable. 
  It is recommended to assign sequential ID numbers from 1 and up. 
2.   The remote control mode of the fi rst MDT421S monitor is set to PRIMARY and those of the other monitors are set to 
 SECONDARY. 
3.   When you direct the remote controller at the remote control signal sensor of the PRIMARY monitor and press the DISPLAY 
button on the remote controller, the ID selection OSD appears at the upper left of the screen. 
ID:1
ID No. :2
Select the ID number of the monitor you want to control using the +/- button 
on the remote controller. 
The ID of the monitor you want to control is displayed at the upper left of its screen. 
By selecting ALL, you can control all the multi-connected monitors.  ID number of the currently viewed monitor
4.   Direct the remote controller at the remote control signal sensor of the PRIMARY monitor. 
  OSD appears on the monitor having the ID number you selected. 
NOTE:
When the ID selection OSD is being displayed on the PRIMARY monitor, press the DISPLAY button on the remote controller 
again to cancel the ID selection OSD and then control the monitor you selected.
NOTE:
If you set the remote control mode wrongly and remote control operation becomes unavailable, press any button on the control 
panel of the monitor to display the OSD screen and change the remote control mode using ADVANCED OPTION. By pressing 
and holding down the DISPLAY button on the remote control for 5 seconds or longer, the remote control mode is initialized to 
NORMAL. 
 
						

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Controlling the LCD monitor via RS-232C/RS-485 Remote Control
This LCD monitor can be controlled by a personal computer connected with an RS-232C cable or a CAT5 cable via the CAT5 Tx 
BOX (option) and CAT5 Rx BOX (option).
Functions that can be controlled by the personal computer are:
•  Power ON or OFF
•  Switching between input signals
Connection
Connection by RS-232C  (For RS-232C cable, the reverse type cable should be used.) 
Connection by CAT5 RS-485  (For CAT5 cable, the straight type cable should be used) 
NOTE:
If your PC (IBM or IBM compatible) is equipped only with a 25-pin serial port connector, a 25-pin serial port adapter is required.  
Contact your dealer for details.
1)  Interface
PROTOCOL
BAUD RATE
DATA LENGTH
PARITY BIT
STOP BIT
FLOW CONTROLRS-232C/RS-485 (CAT5)
9600 [bps]
8 [bits]
NONE
1 [bits]
NONE
This LCD monitor uses RXD, TXD and GND lines for RS-232C control.
2)  Control command diagram
The command is structured by the address code, function code, data code and end code.  The length of the command is 
different for each function.
NOTE:
The example below shows basic commands used for the confi guration consisting of one computer and one monitor (one-to-
one connection). For commands to control multi-connected monitors, contact your dealer in advance. 
HEX
ASCIIAddress code
30h 30h
‘0’ ‘0’Function code
Function
FunctionData code
Data
DataEnd code
0Dh
    [Address code]  30h 30h (In ASCII code, ‘0’ ‘0’) fi xed.
    [Function code]  A code of each fi xed control move.
    [Data code]  A code of each fi xed control data (number) and not always indicated.
    [End code]  0Dh (In ASCII code, ‘
’ ) fi xed.
CAT5 Tx BOX
(option)
RS-232C cableCAT5 cable
To CAT5 
OUT To RS-232C
INTo CAT5 
OUT To CAT5 
RGB5 INTo CAT5 
OUT To CAT5 
RGB5 IN
CAT5 cable
USB cable Type A Type B
PCMonitor with CAT5
Rx BOX (option)Monitor with CAT5
Rx BOX (option)
This connection isn’t necessary when the USB COM port is used.
PC
RS-232C cable RS-232C cableTo RS-232C OUT To RS-232C IN To RS-232C OUTTo RS-232C IN Monitor Monitor
 
						

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3)  Control sequence
(1)  The command from a computer to the LCD monitor will be sent in 600 ms.
(2)  The LCD monitor will send a return command 600 ms* after it has received and encoded. If the command isn’t received 
correctly, the LCD monitor will not send the return command.
(3)  The personal computer checks the command and confi rms if the command, which has been sent, has been executed or 
not.
(4)  This LCD monitor sends various codes other than return code. When having a control sequence by RS-232C, reject other 
codes from personal computers side.
* :  The sending time of return command may delay depending on the condition (during changing of the input signal, etc.).
Example: Turn the power ON ( ‘  ’ is for ASCII code)
Meaning
30 30 21 0D
‘0’ ‘0’ ‘!’ ‘      ’
30 30 21 0D
‘0’ ‘0’ ‘!’ ‘      ’
Sending commands 
from the PCStatus code from 
LCD monitor
Command for
POWER ON
Command received
(Command echoed back)
4)  Operation commands
The operation commands execute the basic operation setting of this LCD monitor.
It may not operate when changing the signal:
Operation ASCII HEX
POWER ON ! 21h
POWER OFF  22h
INPUT RGB 1 _r1 5Fh  72h  31h
INPUT RGB 2 _r2 5Fh  72h  32h
INPUT RGB 3 _r3 5Fh  72h  33h
INPUT RGB 4 _r4 5Fh  72h  34h
INPUT VIDEO _v1 5Fh  76h  31h
INPUT DVD/HD _v2 5Fh  76h  32h
INPUT S-VIDEO** _v3 5Fh  76h  33h
INPUT RGB 5* _r5 5Fh  72h  35h
INPUT RGB 6 _r6 5Fh  72h  36h
• POWER OFF command should be operated over 1 minute after 
the power is turned on.
• POWER ON command should be operated over 1 minute after 
the power is turned off.
* RGB 5 becomes usable when the optional CAT5 Rx BOX is 
mounted. 
** S-VIDEO is SEPARATE only
5)  Read command
Host computer sends the command without Data-code to monitor.
After receiving this command, the monitor returns the command with Data-code of current status to host computer.
Example: When Host computer ask Power status of monitor, the status of monitor is powered-on.
Command from computer
30 30 76 50 0D   ‘0’‘0’‘v’‘P’[enter]Command from MonitorDetail of command
Ask about the power status of monitor.
30 30 76 50  31 0D    ‘0’‘0’‘v’‘P’‘1’[enter]
Monitor is powered-on.
Structure of the Read-command
Function Data (Receive) Function Data (Receive)
ON
vP
vP1 76 50 31
OFF (stand by) 0 76 50 30
RGB-1 (HDMI) vI r1 76 49 72 31
RGB-2 (DVI-D) vI r2 76 49 72 32
RGB-3 (D-SUB) vI r3 76 49 72 33
RGB-6 (DISPLAY PORT) RGB-4 (BNC)
vI r6 76 49 72 36 RGB-5* (CAT5)
* : RGB-5 becomes usable when the optional CAT5 Rx BOX is mounted.  vI r5 76 49 72 35 vI r4 76 49 72 34
Video vI v1 76 49 76 31
DVD/HD vI v2 76 49 76 32
S-VIDEO vI v3 76 49 76 33
HIGHBRIGHT vM
vMp1 76 4D 70 31
STANDARD p2 76 4D 70 32
resolution
1 ˚C
resolution
1 ˚C74 63 31 2B 20 32 35
74 63 32 2B 20 33 31 Input
Picture mode
Temperature
of internal
monitorAround
Main board
Around
Power PCB POWER
(ex.) +31 (ex.) +25 tc1
tc2ASCII HEX
 
						

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Color Control Systems:
Allows you to adjust the colors on your screen and customize the color accuracy of your monitor to a variety of 
standards.
sRGB Color Control:
A new optimized color management standard which allows for color matching on computer displays and other 
peripherals. The sRGB standard, which is based on a calibrated color space, allows for optimal color representation and 
backward compatibility with other common color standards.
OSD (On-Screen-Display) Controls:
Allow you to quickly and easily adjust all elements of your screen image via simple to use on-screen menus.
Plug and Play:
The Microsoft® solution with the Windows® 95/98/Me/2000/XP operating system and Windows Vista® facilitates setup and 
installation by allowing the monitor to send its capabilities (such as screen size and resolutions supported) directly to your 
computer, automatically optimizing display performance.
Intelligent Power Manager System:
Provides innovative power-saving methods that allow the monitor to shift to a lower power consumption level when on 
but not in use, saving two-thirds of your monitor energy costs, reducing emissions and lowering the air conditioning costs 
of the workplace.
Multiple Frequency Technology:
Automatically adjusts monitor to the display card’s scanning frequency, thus displaying the resolution required.
FullScan Capability:
Allows you to use the entire screen area in most resolutions, signifi cantly expanding image size.
Wall Mounting Interface:
Allows for the monitor to be mounted on a wall or an arm using any third party compliant device. MITSUBISHI ELECTRIC 
recommends using mounting interface that comply with TÜV-GS and/or UL1678 standard in North America.
TILING, Frame compensation:
Demonstrates multiple screens with an accurate image and compensates for the bezel width.
ZOOM:
Expands the image individually for horizontal and vertical direction.
Self-diagnosis:
When an internal error should occur, a failure state will be indicated.
CAT5 Long Cable Compensation:
CAT5 long cable compensation prevents image quality degradation (color shift and dull signals) caused by long cable 
lengths.
Features
 
						

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Troubleshooting
No picture
•   The signal cable should be completely connected to the display card/computer.
•   The display card should be completely seated in its slot.
•   Front Power Switch and computer power switch should be in the ON position.
•   Check to make sure that a supported mode has been selected on the display card or system being used.
  (Please consult display card or system manual to change graphics mode.)
•   Check the monitor and your display card with respect to compatibility and recommended settings.
•  Check the signal cable connector for bent or pushed-in pins.
•  If nothing is displayed on the screen when HDCP device is connected, reset the power of the device.
Power Button does not respond
•  Unplug the power cord of the monitor from the AC outlet to turn off and reset the monitor.
Image persistence
•   Please be aware that LCD Technology may experience a phenomenon known as Image Persistence. Image Persistence
  occurs when a residual or “ghost” image of a previous image remains visible on the screen. Unlike CRT monitors, LCD 
  monitors’ image persistence is not permanent, but constant images being displayed for a long period of time should be 
avoided. To alleviate image persistence, turn off the monitor for as long as the previous image was displayed. For example, 
if an image was on the monitor for one hour and a residual image remains, the monitor should be turned off for one hour to 
erase the image.
NOTE:
As with all personal display devices, MITSUBISHI ELECTRIC recommends displaying moving images and using a moving screen 
saver at regular intervals whenever the screen is idle or turning off the monitor when not in use.
Image is unstable, unfocused or swimming is apparent
•   Signal cable should be completely attached to the computer.
•   Use the OSD Image Adjust controls to focus and adjust display by increasing or decreasing the fi ne adjustment.
  When the display mode is changed, the OSD Image Adjust settings may need to be re-adjusted.
•   Check the monitor and your display card with respect to compatibility and recommended signal timings.
•   If your text is garbled, change the video mode to non-interlace and use 60 Hz refresh rate.
Image of component signal is greenish
•   Check to see if the DVD/HD input connector is selected.
LED on monitor is not lit (no green or red color can be seen)
•   Power Switch should be in the ON position and power cord should be connected.
•   Make certain the computer is not in a power-saving mode (touch the keyboard or mouse).
RED LED on monitor is blinking
•   A certain failure might have occurred, please contact your nearest authorized MITSUBISHI ELECTRIC service facility.
Display image is not sized properly
•   Use the OSD Image Adjust controls to increase or decrease the coarse adjustment.
•   Check to make sure that a supported mode has been selected on the display card or system being used.
  (Please consult display card or system manual to change graphics mode.)
Selected resolution is not displayed properly
•   Use OSD Display Mode to enter Information menu and confi rm that the appropriate resolution has been selected.
  If not, select corresponding option.
 
						

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No Sound
•  Check to see if speaker cable is properly connected.
•   Check to see if mute is activated.
•  Check to see if volume is set at minimum.
Remote Control is not available
•   Check the Remote Control’s batteries status.
•   Check if batteries are inserted correctly.
•   Check if the Remote Control is pointing at the monitor’s remote sensor.
“SCHEDULE”/“OFF TIMER” function is not working properly
•   The “SCHEDULE” function will be disabled when the “OFF TIMER” is set.
•   If the “OFF TIMER” function is enable and the power to the LCD monitor is turned off if the power supply is interrupted 
  unexpectedly, then the “OFF TIMER” will be reset.
Stripe Noise
Either light vertical or horizontal stripes may appear, depending on the specifi c display pattern. This is no product fault or 
degradation.
“NO SIGNAL” is displayed on the screen
Image may not be displayed right after HDCP device is connected.