BenQ Projector HT4050 User Manual

Projector features 11
Controls and functions
Projector
9. TEMPerature indicator light
Lights up red if the projectors temperature 
becomes too high. See Indicators on page 
68 for details.
10. Keystone/Arrow keys (/▲ Up)
Manually corrects distorted images 
resulting from an angled projection. 
See Correcting keystone on page 32 for 
details.
11. LAMP indicator light
Indicates the status of the lamp. Lights up 
or flashes when the lamp has developed a 
problem. See Indicators on page 68 for 
details.
12....

Projector features 12
Remote control
1.  ON,   OFF
Toggles the projector between on and off 
mode.
2. 3D, INVERT
Launches the 3D menu and toggles the 
invert function between on and off.
3. Arrow keys (▲ Up/▼ Down/◄ Left/
► Right)
When the On-Screen Display (OSD) menu 
is activated, these keys are used as 
directional arrows to select the desired 
menu items and to make adjustments.
When the OSD menu is off and you are 
under the MHL connection mode, these 
arrows keys are available for controlling 
your...

Projector features 13
10. LIGHT
The LED backlight lights up and stays on 
for approximately 30 seconds when 
pressing any key on the remote control. 
Pressing any other keys within the 10 
second again turns the LED backlight off.
11. AUTO
Automatically determines the best picture 
timings for the displayed image.
12. ECO BLANK
Used to blank the screen picture.
13. MENU
• Accesses the On-Screen Display 
(OSD) menu.
• Goes back to previous OSD menu, 
exits and saves menu settings.
14. SOURCE
Displays the...

Projector features 14
Remote control effective range
Infra-Red (IR) remote control sensor is located on the 
front and the top of the projector. The remote 
control must be held at an angle within 30 degrees 
perpendicular to the projectors IR remote control 
sensor to function correctly. The distance between 
the remote control and the sensor should not exceed 
8 meters (~ 26 feet). 
Make sure that there are no obstacles between the 
remote control and the IR sensor on the projector 
that might obstruct...

Projector features 15
Replacing the remote control battery 
• Avoid excessive heat and humidity. 
• There may be battery damage if the battery is incorrectly replaced. 
• Replace only with the same or equivalent type recommended by the battery manufacturer.
• Dispose of the used battery according to the battery manufacturer’s instructions.
• Never throw a battery into a fire. There may be danger of an explosion. 
• If the battery is dead or if you will not be using the remote control for a long time,...

Positioning your projector 16
Positioning your projector
Choosing a location
Before choosing an installation location for your projector, take the following factors into 
consideration:
• Size and position of your screen
• Electrical outlet location
• Location and distance between the projector and the rest of your equipment
You can install your projector in the following ways. 
1. Front Table 
Select this location with the projector placed near the floor in front of 
the screen.
This is the most common...

Positioning your projector 17
Obtaining a preferred projected image size
The projected image size is determined by the distance from the projector lens to the 
screen, the zoom setting, and the video format.
Projection dimensions
Refer to Dimensions on page 71 for the center of lens dimensions of this projector 
before calculating the appropriate position.
The screen aspect ratio is 16:9 and the projected picture is 16:9. 




Floor Installation
: Screen             : Center of lens
 
 

Ceiling...

Positioning your projector 18
There is 5% tolerance among these numbers due to optical component variations. BenQ 
recommends that if you intend to permanently install the projector, you should physically test 
the projection size and distance using the actual projector before you permanently install it, so 
as to make allowance for this projectors optical characteristics. This will help you determine 
the exact mounting position so that it best suits your installation location. 

Positioning your projector 19
Shifting the projection lens
The lens shift control provides flexibility for installing your projector. It allows the 
projector to be positioned off the center of the screen.
The lens shift is expressed as a percentage of the projected image width or height. It is 
measured as an offset from the projected image’s horizontal or vertical center. You can 
shift the projection lens within the allowable range depending on your desired image 
position. 
Lens shift adjustment will...

Connection 20
Connection
When connecting a signal source to the projector, be sure to:
1. Turn all equipment off before making any connections.
2. Use the correct signal cables for each source.
3. Ensure the cables are firmly inserted. 
• In the connections shown below, some cables may not be included with the projector (see 
Shipping contents on page 8). They are commercially available from electronics stores.
• The connection illustrations below are for reference only. The rear connecting jacks...