BenQ LH820ST User manual

Dig ital Projector
User Manual
LH820ST V1.00

2 Warranty and Copyright information
Warranty and Copyright information
Limitedwarranty
BenQ warrants this product against any defects in material and workmanship, under normal usage and
storage.
Proof of purchase date will be required with any warranty claim. In the event this product is found to be
defective within the warranty period, BenQ's only obligation and your exclusive remedy shall be
replacement of any defective parts (labor included). To obtain warranty service, immediately notify the
dealer from which you purchased the product of any defects.
Important: The above warranty shall be void if the customer fails to operate the product in accordance
with BenQ's written instructions, especially the ambient humidity must be in-between 10% and 90% ,
temperature in-between 0°C and 35°C, altitude lower than 4920 feet, and avoiding to operate the
projector in a dusty environment. This warranty gives you specific legal rights, and you may have other
rights which vary from country to country.
For other information, please visit www.BenQ.com.
Copyrig ht
Copyright © 2022 by BenQ Corporation. All rights reserved. No part of this publication may be
reproduced, transmitted, transcribed, stored in a retrieval system or translated into any language or
computer language, in any form or by any means, electronic, mechanical, magnetic, optical, chemical,
manual or otherwise, without the prior written permission of BenQ Corporation.
Disclaimer
BenQ Corporation makes no representations or warranties, either expressed or implied, with respect
to the contents hereof and specifically disclaims any warranties, merchantability or fitness for any
particular purpose. Further, BenQ Corporation reserves the right to revise this publication and to make
chang es f rom time to time in the contents hereof without oblig ati on to notif y any person of such
rev i si on or chang es.
*DLP, Digital Micromirror Device and DMD are trademarks of Texas Instruments. Others are
copyri g hts of thei r respecti ve compani es or org ani zati ons.

3Table of Contents
Table of Contents
Warranty and Copyright information ............................................................................................ 2
Important safety instructions ........................................................................................................... 4
Notice ........................................................................................................................................ 7
Introduction ....................................................................................................................................... 8
Shipping contents ...................................................................................................................... 8
Projector exterior view .............................................................................................................. 9
Controls and functions............................................................................................................. 10
Positioning your projector ............................................................................................................. 12
Choosing a location ................................................................................................................. 12
Obtaining a preferred projected image size............................................................................. 13
Mounting the projector............................................................................................................ 14
Adjusting the projected image ................................................................................................. 15
Connection ....................................................................................................................................... 17
Operation ......................................................................................................................................... 19
Starting up the projector .......................................................................................................... 19
Using the menus ...................................................................................................................... 20
Securing the projector.............................................................................................................. 22
Switching input signal ............................................................................................................. 23
Controlling the projector via LAN.......................................................................................... 24
Upgrading firmware via LAN................................................................................................. 25
Shutting down the projector ....................................................................................................25
Direct power off ...................................................................................................................... 25
Menu operation ............................................................................................................................... 26
Basic menu .............................................................................................................................. 26
Advanced menu ...................................................................................................................... 28
Maintenance .................................................................................................................................... 36
Care of the projector ................................................................................................................ 36
Light information ..................................................................................................................... 37
Troubleshooting .............................................................................................................................. 39
Specifications ................................................................................................................................... 40
Projector specifications ........................................................................................................... 40
Dimensions .............................................................................................................................. 41
Timing chart ............................................................................................................................ 42

4 Important safety instructions
Important safety instructions
Y our projector is desig ned and tested to meet the latest standards f or saf ety of inf ormation technol og y
equipment. However, to ensure safe use of this product, it is important that you follow the instructions
mentioned in this manual and marked on the product.
1. Please read this manual before you
operate your proj ector. Save it forfuture
reference.
2. Do not look straight at the proj ector
lens during operation. The intense light
beam may damage your eyes.
3. Refer servicing to qualified service
personnel.
4. Always open the lens shutter (if any) or
remove the lens cap (if any) when the
projector light source is on.
5. The light source becomes extremely hot
during operation. Al l ow the projector to cool
for approximately 45 minutes prior to
removing the light source assembly for
replacement.
6. In some countries, the line voltage is NOT
stable. This projector is desig ned to operate
safely within a mains voltage between 100 to
240 volts AC, but could fail if power cuts or
surges of ±10 volts occur. I n areas where
the mai ns voltage may f l uctuate or cut
out, it is recommended that you
connect your projector through a power
stabilizer, surge protector or
uninterruptible power supply (UPS).
7. Do not block the projection lens with any
objects when the projector is under
operation as this could cause the objects to
become heated and def ormed or even cause a
f i re. To temporari ly turn of f the l ig ht source,
use the blank function.
8. Do not operate light source beyond the rated
light source life. Excessive operation of light
source beyond the rated life could cause them
to break on rare occasions.

5Important safety instructions
9. Never replace the light source assembly or
any electronic components unless the
projector is unplugged.
10. Do not place this product on an unstable cart,
stand, or table. The product may fall,
sustaining serious damage.
11. Do not attempt to disassemble this projector.
There are dangerous high voltag es inside
which may cause death if you should come
into contact with live parts. The only user
serviceable part is the light source which has
its own removable cover.
Under no circumstances should you ever
undo or remove any other cov ers. R ef er
servicing only tosuitably qualifiedprofessional
servi ce personnel .
12. Do not block the ventilation holes.
- Do not pl ace this proj ector on a blanket, bedding or
any other soft surface.
- Do not cover thi s projector with a cloth or any other
item.
- Do not place inflammables near the projector.
If the ventilation holes are seriously
obstructed, ov erheati ng inside the projector
may result in a fire.
13. Always place the projector on a level,
horizontal surface during operation.
- Do not use if tilted at an angle of more than 10
degrees left to right, nor atangle of more than 15
deg rees f ront to back. Using the projector when it is
not fully horizontal may cause a malfunction of, or
damag e to, the li g ht source.
14. Do not stand the projector on end vertically.
Doing so may cause the projector to fall over,
causing injury or resulting in damage to the
projector.
15. Do not step on the projector or place any
objects upon it. Besides probable physical
damag e to the projector, doing so may result
in accidents and possible injury.
16. When the projector is under operation, you
may sense some heated air and odor from its
ventilation grill. It is a normal phenomenon
and not a product defect.

6 Important safety instructions
17. Do not place liquids near or on the projector.
Liquids spilled into the projector may cause it
to f ai l . I f the proj ector does become wet,
disconnect it from the power supply's power
outlet and cal l B enQ to hav e the projector
serviced.
18. This product is capable of displaying inverted
images for ceiling/wall mount installation.
19. This apparatus must be earthed.
20. Do not place this projector in any of the
following environments.
- Space that is poorly ventilated or confined. Allow at
least 50 cm clearance from walls and free flow of air
around the projector.
- L ocations where temperatures may become
excessively high, such as the inside of a car with all
windows rolled up.
- L ocations where excessive humidity, dust, or cigarette
smoke may contaminate optical components, shorten
the projector's lif e span and darken the image.
- Locations near fire alarms
- Locations with an ambient temperature above 40°C /
104°F
- L ocations where the altitudes are higher than 3000 m
(10000 feet).
3000 m
(10000 feet)
0 m
(0 feet)

7Important safety instructions
Notice
To ensure safe use of this product, Please read the user manual for details before you operate your
projector.
Caution - Use of control or adjustments or performance of procedures other than those specified
herei n may resul t i n hazardous radiati on exposure.
• Notice i s g i v en to supervi se chi l dren and to nev er allow them to state into the projector beam at any
di stance f rom the projector.
• Notice is given to use caution when using the remote control for starting the projector while in front
of the projection lens.
• Noti ce is g i ven to the user to av oi d the use of optional aids such as binoculars or telescopes inside the
beam.
Risk Group 2
1. According to the classification of
photobiological safety of light sources and
light source systems, this product is Risk
Group 2, IE C 62471-5:2015.
2. Possibly hazardous optical radiation emitted
f rom this product.
3. Do not stare at operating light source. May
be harmful to the eyes.
4. As with any bright source, do not stare into
the direct beam.
The projector's light source unit uses a laser.
Laser Caution
This product belongs to CL ASS 1 consumer laser
product and complies with IE C 60825-1:2014, E N
60825-1:2014/A11:2021 and E N 50689:2021.
Abov e l aser caution is located on the bottom of
this apparatus

8 I ntroduction
I ntroduction
Shipping contents
Carefully unpack and verify that you have all of the items shown below. If any of these items are missing,
please contact your place of purchase.
Standard accessories
Optional accessories
Replacing the remote control batteries
1. Press and open the battery cover, as illustrated.
2. Remove the old batteries (if applicable) and install two
AAA batteries. Make sure that the positive and negative
ends are positi oned correctl y , as il l ustrated.
3. Replace the battery cover until it clicks into place.
Projector Remote control with
batteries Quick Start Guide
P ower cord V GA cabl e Warranty card*
• The supplied accessories will be suitable for your region, and may differ from those illustrated.
• *The warranty card is only supplied in some specific regions. Please consult your dealer for detailed information.
1. 3D glasses 2. Dust filter
• Avoid leaving the remote control and batteries in an excessive heat or humid environment like the kitchen,
bathroom, sauna, sunroom or in a closed car.
• Replace only with the same or equivalent type recommended by the battery manuf acturer.
• Dispose of the used batteries according to the manufacturer's instructions and local environment regulations f or
your region.
• Never throw the batteries into a f ire. There may be danger of an explosion.
• I f the batteries are dead or if you will not be using the remote control for an extended period of time, remove the
batteries to avoid damage to the remote control from possible battery leakage.

9I ntroducti on
Projector exterior view
1. Lens cover
2. Vent (air exhaust)
3. IR remote sensor
4. Adjuster feet
5. Projection lens
6. Focus ring
7. External control panel
(See Controls and functions on page 10.)
8. Vent (air inlet)
9. Speaker
10. Wall mount holes
11. Security bar
12. AC power jack
13. Kensington anti-theft lock slot
14. USB Type A port
15. Audio input jack
Audio output j ack
16. Microphone
17. Audio (L/R) input jack
18. HDMI 1 input port
18.1 WiFi Dongle Port (HDMI 2 input port for
HDMI dongle)
19. Video input jack
20. S-Video input jack
21. RGB (PC) signal input jack
22. RS-232 control port
23. RGB (PC) signal output jack
24. RJ -45 L AN input jack
25. USB Mini-B port
26. PointWrite module holes
2
3
4
5
16
4
10
11
10
10
10
12
13
14
15
16
17
18
19
20
21
22
23
24
25
4
8
18.1
7
26
9

10 I ntroducti on
Controls and functions
Projector & Remote control
1. POWER
Toggles the projector between standby mode
and on.
ON/ Of f
Toggles the projector between standby mode
and on.
2. POWER indicator light/TEMPerature
warning light/LIGHT indicator light
(See Indicators on page 39.)
3. IR remote sensor
4. SOURCE
Displays the source selection bar.
5. BACK
Goes back to previous OSD menu, exits and
saves menu settings.
6. Arrow keys ( , , , )
When the On-Screen Display (OS D) menu is
activated, these keys are used as directional
arrows to select the desired menu items and
to make adjustments.
2D Keystone keys ( , )
Displays the 2D keystone correction page.
Volumekeys /
Decreases or increase the projector volume.
7. ECO BLANK
Used to hide the screen picture.
Do not block the projection l ens f rom
projecting as this could cause the blocking
object to become heated and deformed or
even cause a f ire.
5
4
6
8
7
9
10
3
2
1
All the key presses described in this document
are available on the remote control or projector.
1
5
10
9
8
11
13
14
15
16
17
18
212
22
4
7
19
20
6
12

11I ntroducti on
Remote control effective range
The remote control must be held at an angle within 30 degrees perpendicular to the projector's IR
remote control sensor(s) to function correctly. The distance between the remote control and the
sensor(s) should not exceed 8 meters (~ 26 feet).
Make sure that there are no obstacles between the remote control and the IR sensor(s) on the
projector that might obstruct the infra-red beam.
8. OK
Conf irms the selected On-S creen Di splay
(OSD) menu item.
9. AUTO
Automatically determines the best pi cture
timing s f or the displayed imag e when PC signal
(analog RGB) is selected.
10. MENU
Turns on the On-Screen Display (OSD) menu.
11. PICTURE
Selects the picture mode.
12. LIGHT SOURCE
Displays the LIGHT SOURCE menu for
selecting a suitable light operating mode.
13. MUTE
Tog g l es projector audi o between on and of f .
14. LIGHT
Turns on the remote control backl i g ht f or a
few seconds. To keep the backlight on, press
any other key while the backlight is on. Press
the key ag ai n to turn the backl ig ht of f .
15. Projector ID code keys
Used to set projector I D code.
16. ZOOM+/ZOOM-
Magnifies or reduces the projected picture
size.
17. PAGE +/PAGE -
Operate your display software program (on a
connected PC) which responds to page
up/down commands (like M icrosoft
PowerPoint).
18. QUICK INSTALL
Quickly selects several functions to adjust the
projected image and displays the test pattern.
19. ASPECT
Selects the display aspect ratio.
20. INFO
Displays the projector information.
21. 3D
Displays the 3D menu.
22. FREEZE
Freezes the projected image.
The bottom port on remote
control is not support on L H820ST
model.
• Operating the projector f rom the front • Operating the projector f rom the top
Approx.+30º
Approx.+30º

12 Positioning your projector
Positioning your proj ector
Choosing a location
B ef ore choosing an instal lati on location f or your proj ector, take the f ol l owi ng f actors i nto considerati on:
• S i ze 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.
A f ter turni ng on the proj ector, g o to Advanced Menu - Settings > Proj ector I nstallation >
Proj ector I nstallation and press / to select a setting.
You can also use QUICK INSTALL on the remote control to access this menu.
1. Front Table
S elect this l ocati on with the projector pl aced on
the table i n f ront of the screen. This is the most
common way to position the projector for quick
setup and portability.
2. Rear Table
S elect this l ocation wi th the proj ector pl aced on
the table behind the screen. Note that a special
rear proj ecti on screen i s required.
3. Front Ceiling
S elect this l ocati on with the projector suspended
upside-down in f ront of the screen. Purchase the
BenQProjector Ceiling/Wall Mount Kit from your
dealer to mount your projector.
4. Rear Ceiling
S elect this l ocation wi th the proj ector suspended
upside-down from behind the screen. Note that a
special rear projection screen and the BenQ
Projector Ceiling/Wall Mount Kit are required for
this installation location.

13Positioning your projector
Obtaining a preferred projected image size
The distance f rom the projector l ens to the screen, the zoom setti ng (i f available), and the video f ormat
each factors in the projected image size.
Projection dimensions
• The screen aspect ratio is 16:9 and the projected picture is in a 16:9 aspect ratio
For example, if you are using a 80-inch screen, the recommended projection distance is 876 mm.
• * The vertical offset value is the vertical distance f rom the bottom edg e of the image (when the projector is on a
table, diag ram on the lef t), or top edge of the image (when the projector is ceiling mounted, diagram on the right)
to the centerline of lens.
• Due to the lens optical characteristics, every projector has its vertical offset ratio. The vertical offset value
normally gets larger while the projection distance increases.
Screen size
Projection distance (mm) *Vertical offset (A)
(mm)
Diagonal H (mm) W (mm)
Inch mm
30 762 374 664 329 34
40 1016 498 886 438 45
50 1270 623 1107 548 56
60 1524 747 1328 657 67
70 1778 872 1550 767 78
80 2032 996 1771 876 90
90 2286 1121 1992 986 101
100 2540 1245 2214 1095 112
110 2794 1370 2435 1205 123
120 3048 1494 2657 1315 134
130 3302 1619 2878 1424 146
140 3556 1743 3099 1534 157
150 3810 1868 3321 1643 168
160 4064 1992 3542 1753 179
170 4318 2117 3763 1862 191
180 4572 2241 3985 1972 202
190 4826 2366 4206 2082 213
200 5080 2491 4428 2191 224
210 5334 2615 4649 2301 235
220 5588 2740 4870 2410 247
H
W
Projection distance
Centerline of lens
Screen
16:9 Screen diagonal
Vertical Offset (A)*
Vertical Offset (A)*
Screen
Centerline of lens
Projection distance
H
W
16:9 Screen diagonal

14 Positioning your projector
• If your measured projection distance is 1000 mm, the closest match in the "Projection distance (mm)"
column is 986 mm. Looking across this row shows that a 90'' (about 2.2 m) screen is required.
• All measurements are approximate and may vary from the actual sizes.
B enQ recommends that if y ou i ntend to permanently i nstal l the projector, you shoul d phy sical ly test the
projection size and distance using the actual projector in situ before you permanently install it, so as to make
allowance for this projector's optical characteristics. This will help you determine the exact mounting position so
that it best suits your installation location.
• To optimize your projection quality, we suggest doing the projection by following the values in the non-gray cells.
• The values in the gray cells are for reference only.

15Positioning your projector
Mounting the projector
If you intend to mount your projector, we strongly recommend that you use a proper fitting BenQ
projector mounting kit and that you ensure it is securely and safely installed.
If you use a non-BenQ brand projector mounting kit, there is a safety risk that the projector may fall
down due to an improper attachment through the use of the wrong gauge or length screws.
Before mounting the projector
• Purchase a BenQ projector mounting kit from the place you purchased your BenQ projector.
• BenQ recommends that you also purchase a separate Kensington lock compatible security cable and
attach it securely to both the Kensington lock slot on the projector and the base of the mounting
bracket. This will perform the secondary role of restraining the projector should its attachment to the
mounting bracket become loose.
• Ask your dealer to install the projector for you. Installing the projector on your own may cause it to
fall and result in injury.
• Take necessary procedures to prevent the projector from falling off such as during an earthquake.
• The warranty doesn‘t cover any product damage caused by mounting the projector with a non-BenQ
brand projector mounting kit.
• Consider the surrounding temperature where the projector is ceiling/wall mounted. If a heater is used,
the temperature around the ceiling/wall may be higher than expected.
• Read the user manual for the mounting kit about the range of torque. Tightening with torque
exceeding the recommended rang e may cause damage to the projector and subsequently f alling off .
• Make sure the power outlet is at an accessible height so that you can easily shut down the projector.
Ceiling/Wall mount installation diagram
Ceiling/Wall mount screw: M4
(M ax L = 25 mm; M in L = 20 mm)
Unit: mm
339.5
242.0
216.8
235.7
215.5
149.5
228.0
131.5
235.7

16 Positioning your projector
Adjusting the projected image
Adjusting the projection angle
If the projector is not placed on a flat surface or the
screen and the projector are not perpendicular to
each other, the projected image becomes
trapezoidal. Y ou can screw the adjuster feet to
fine-tune the horizontal angle.
To retract the feet, screw the adjuster f eet in a
rev erse di recti on.
Auto-adjusting the image
In some cases, you may need to optimize the picture quality. To do this, press AUTO. Within 3
seconds, the built-in Intelligent Auto Adjustment function will re-adjust the values of Frequency and
Clock to provide the best picture quality.
The current source information will be displayed in the corner of the screen for 3 seconds.
Fine-tuning the image clarity
Do not look into the lens whi l e the li g ht source i s on. The strong li g ht f rom the li g ht source may cause damag e to
your eyes.
This function is only available when PC signal (analog RGB) is selected.
Sharpen the image by rotating the focus ring.

17Positioning your projector
Correcting 2D keystone
2D Keystone function enables a wider projector installation area compared to conventional projectors
with l i mited posi ti oning i n f ront of the screen.
To correct this, you will need to manually correct it following one of these steps.
1. Do one of the f ollowing steps to display the 2D keystone
correction page.
• Press MENUon the remote control. Press Display > 2D
Keystone.
• Or press / on the remote control to adjust keystone.
2. A f ter the 2D K eystone correction page displays. Press / to
adjustvertical values. Press / to adjust horizontal values.
Adjusting Corner Fit
Manually adjust four corners of the image by setting the horizontal and vertical values.
1. Do one of the f ollowing steps to display the corner fit page.
• Press MENUon the remote control. Press Display > Corner
Fit.
2. A f ter the Corner Fit correction page displays. Press / to to
adjustvertical values. Press / to adjust horizontal values.

18 Connection
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 sig nal cables f or each source.
3. Ensure the cables are firmly inserted.
• In the connections above, some cables may not be included with the projector (see Shipping contents on page 8).
They are commercially available f rom electronics stores.
• The connection illustrations are for reference only . The rear connecting jacks available on the projector vary with
each projector model.
• Many notebooks do not turn on their external video ports when connected to a projector. Usually a key combo
like FN + function key with a monitor symbol turns the external display on/off. Press FN and the labeled function
key simultaneously. Refer to your notebook's documentation to find your notebook's key combination.
• I f the selected video image is not displayed after the projector is turned on and the correct video source has been
selected, check that the video source device is turned on and operating correctly. Also check that the sig nal cables
have been connected correctly.
8
1
4
21
56
37
7
10
9
Notebook or
desktop computer
VGA cable
VGA to DVI-A cable
USB cable
Component V i deo to V GA
(D-Sub) adapter cable
S-V ideo cable
Video cable
Audio cable
Audio L /R cable
HDM I cable
1
2
3
4
5
6
7
8
9
Speakers
Monitor A/V device

19Connection
You need only connect the projector to a video source device using just one of the connecting methods,
however each provides a different level of video quality.
Connecting audio
The projector has built-in mono speaker(s) which are designed to provide basic audio functionality
accompanying data presentations for business purposes only. They are not designed for, nor intended
for stereo audio reproduction use as might be expected in home theater or home cinema applications.
Any stereo audio input (if provided), is mixed into a common mono audio output through the projector
speaker(s).
The built-in speaker(s) will be muted when the AUDIO OUT jack is connected.
Ter mi nal Picture quality
HDMI I Best
Component Video (through R GB
input) Better
S-Video Good
Video Normal
• The projector is only capable of playing mixed mono audio, even if a stereo audio input is connected.
• I f the selected video image is not displayed after the projector is turned on and the correct video source has been
selected, check that the video source device is turned on and operating correctly. Also check that the signal cables
have been connected correctly.

20 Operation
Operation
Starting up the projector
1. Plug the power cord. Turn on the power outlet switch
(where f i tted). The power indi cator on the projector
lights orange after power has been applied.
2. Press on the projector or on the remote
control to start the projector. The power indi cator
flashes green and stays green when the projector is on.
The start up procedure takes about 30 seconds. In the
later stage of start up, a startup logo is projected.
(I f necessary ) R otate the f ocus ri ng to adj ust the imag e
clearness.
3. I f the projector i s activ ated f or the f irst ti me, select y our
OSD language following the on-screen instructions.
4. If you are prompted for a password, press the arrow keys
to enter a 6-dig i t password. S ee Utilizing the password
f uncti on on pag e 23.
5. Switch all of the connected equipment on.
6. The projector will search for input signals. The current
input signal being scanned appears. If the projector does
not detect a valid signal, the message —No Signal“ will
continue displaying until an input signal is found.
You can also press SOURCE to select your desired input signal. See Switching input signal on page
24.
• Please use the original accessories (e.g. power cord) to avoid possible dang ers such as electric shock and f ire.
• If the projector is still hot from previous activity, it will run the cooling fan for approximately 90 seconds before
energizing the light source.
• The S etup Wizard screenshots are for reference only and may dif fer from the actual design.
• I f the frequency/resolution of the input signal exceeds the projector's operating range, you will see the message
—Out of R a ng e“ displayed on the background screen. Please change to an input signal which is compatible with
the projector's resolution or set the input sig nal to a l ower setting . S ee Timing chart on page 43.
• I f no si g nal is detected f or 3 mi nutes, the proj ector automaticall y enters sav ing mode.