Sharp Lc43lb371u User Guide

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LC-43LB371U/LC-50LB371U 43"/50" 1080p, 60Hz, LED Sharp Roku TV
Controlling other devices through CEC
Consumer Electronics Control (CEC) enables your TV and other CEC-compatible home entertainment components to 
control one other in various ways. First, the CEC-compatible devices must “discover” one another and report their 
capabilities. After this, one device can control another according to the features you enable. For example, playing a disc on a 
Blu-ray player could switch your TV to the Blu-ray player's input. Or, powering off your TV could also power off the Blu-ray 
player and the home theater receiver.
Discovering connected CEC devices
To discover CEC devices:
1Make sure that your CEC-compatible components are connected to your TV with a suitable high-speed HDMI cable that 
supports HDMI ARC and CEC control.
2Turn on each component and make sure all components have CEC enabled.
3On your TV’s Home screen menu, navigate to Settings > System > Control other devices (CEC) and then select Search 
for CEC devices. Press OK to repeat the discovery process, if necessary. 
When finished, your TV displays a list of CEC devices that are connected to each HDMI input, as well as any devices that had 
previously been connected. Your TV remembers the names of multiple CEC devices even when they are no longer 
connected. If the list is longer than the allowed space, press   to see a complete list in a scrollable window.
Enabling HDMI ARC
HDMI1 (ARC) is the audio return channel that is available on one of your TV’s HDMI ports. The audio return channel enables 
you to send a Dolby Digital audio signal back to a home theater receiver that is also sending an audio and video signal into 
your TV. Using HDMI ARC reduces the number of cables needed and optionally lets you control the volume and mute state 
of the receiver by enabling system audio control.
HDMI ARC is disabled by default. To enable HDMI ARC, in the Home screen menu, navigate to Settings > System > Control 
other devices (CEC), and then highlight HDMI ARC. Press OK to enable or disable the feature.
Enabling system audio control
System audio control enables your TV remote control to change the volume and mute state of an amplifier or sound bar 
connected through HDMI, and to display the external device's volume and mute status in your TV’s on-screen display. 
Your TV automatically turns off its internal speakers and sends volume and mute control signals to an external amplifier 
when all of the following are true:
•System audio control is enabled on your TV.
• Your TV is connected to a CEC-compatible amplifier, it is powered on, and CEC discoverability is enabled.
• The CEC-compatible amplifier's HDMI ARC connector is connected to your TV’s HDMI1 (ARC) connector with a suitable 
HDMI cable.
When the CEC-compatible amplifier is off, your TV automatically turns on its speakers (unless you have turned them off as 
described in Turning off the speakers on page65) and resumes local control of volume and mute state.
To enable or disable system audio control, in the Home screen menu, navigate to Settings > System > Control other 
devices (CEC) and highlight System audio control. Press OK to enable or disable the feature.
Enabling 1-touch play
1-touch play enables a component to control which TV input is active. For example, pressing Play on your Blu-ray player 
switches your TV to the Blu-ray input. 
1-touch play is disabled by default. To enable 1-touch play, in the Home screen menu, navigate to Settings > System > 
Control other devices (CEC) and highlight 1-touch play. Press OK to enable or disable the feature.
Enabling system standby
The system standby feature causes other components to power off when you power off your TV. Depending on the CEC 
System Standby implementation, it also might enable connected components to power off your TV when you power off the 
component.
System standby is disabled by default. To enable system standby, in the Home screen menu, navigate to Settings > System 
> Control other devices (CEC) and highlight System standby. Press OK to enable or disable the feature.
Tip
Some manufacturers have their own branded names for CEC functionality, so you 
might need to read the product documentation to correctly identify the CEC features 
of the device.
Note
Enabling HDMI ARC also enables System audio control. After enabling HDMI ARC, 
you can disable System audio control if you prefer. 
						

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Restarting your TV
You can restart your TV when necessary. Restarting has the same effect as unplugging your TV power and then plugging it 
in again.
To restart your T V, navigate to Settings > System > Power and then select System restart. Highlight Restart, and then 
press OK to confirm restart. 
While your TV restarts, the screen goes dark for a few seconds, and then displays the startup screen for a few more seconds. 
When the restart operation completes, the TV displays the activity you selected in Power on settings on page58.
Resetting your TV
You can choose to reset only your TV picture and audio settings to their original values, or perform a full factory reset to 
return your TV to the state it was in when you first unpacked and turned it on.
Reset audio/video settings
To reset only your TV picture and audio settings to their original values, navigate to Settings > System > Advanced system 
settings> Factory reset, and then highlight Reset TV audio/video settings. Read the information on the screen to make 
sure you understand what the reset operation does.
To proceed with the reset operation, press PLAY/PAUSE three times in a row.
Factory reset everything
A full factory reset returns your TV to its original, out-of-the-box state. When finished, you must repeat Guided Setup, 
reconnecting to the Internet, re-linking your Roku account, and reloading any streaming channels. You also must repeat 
Antenna TV setup and input configuration. 
Factory reset is the recommended choice if you want to transfer your T V to another owner, and is the only choice if you want 
to switch from store mode to home mode (if you inadvertently selected store mode during Guided Setup).
To perform a factory reset, navigate to Settings > System > Advanced system settings> Factory reset, and then highlight 
Factory reset everything. Read the information on the screen to make sure you understand what this reset operation does. 
To proceed with the full factory reset, use the on-screen number pad to enter the code displayed on the screen, and then 
select OK to proceed.
When the factory reset operation completes, your TV restarts and displays the first Guided Setup screen.
What if I can’t access the Factory Reset option?
It is possible that your TV might get into a state where you cannot access the various menus, including the menu option that 
lets you perform a factory reset operation. If that happens, you can force your TV to reset by following these steps:
1Using a straightened paper clip or ball-point pen, press and hold the recessed RESET button on your TV connector 
panel.
2Continue to hold the RESET button for approximately 15 seconds. 
During this time, the status light turns off, and then turns on bright, and then pulses. When the reset cycle completes, the 
light either comes on dim (if your TV power was off when you started) or your TV screen comes on and the light turns off 
(if your TV power was on when you started).
3When the status light turns on steady dim or your TV screen comes on, release the RESET button.
4Proceed through Guided Setup. See Setting up your TV on page33.
Changing your Roku Channel Store PIN preference
When you created your Roku account, you were given the opportunity to create a PIN code and to specify when it must be 
used. If you created a Channel Store PIN and want to change it, or you don’t remember your PIN, or if you didn’t create a 
Channel Store +PIN and want to add one, you can easily make these changes.
1On a computer, tablet, or smartphone, use your web browser to go to https://my.roku.com.
2Enter your email address and password to sign in. After signing in, the My Account page appears.
3Under PIN Preference, click Update to open the Choose Your PIN Preferences page.
4Skip this step if you just want to change your PIN. Otherwise, choose the option your prefer from among those listed:
• Require a PIN to make purchases or to add any item from the Channel Store.
• Require a PIN to make purchases.
• Do not require a PIN to make purchases.
5If you choose either of the first two options, enter your PIN twice in the appropriate boxes. 
6Click Save Changes to save your changes and return to the My Account page. Note that your current setting is described 
under PIN Preference. 
						

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LC-43LB371U/LC-50LB371U 43"/50" 1080p, 60Hz, LED Sharp Roku TV
Getting system updates
If your TV is connected to the Internet and linked with a Roku account, it will automatically get updates from time to time. 
You don’t need to do anything. But if you are aware that an update is available and you don’t want to wait until your TV 
updates itself, you can manually check for updates.
If your TV is not connected to the Internet, you can still get updates by using a USB flash drive.
You can download an updated User Guide that matches your Roku TV software version from the Insignia web site at: 
www.insigniaproducts.com/support.html
To determine your current Roku TV software version, go to Settings > System > About, and then press OK or navigate to 
the right.
Checking for updates on a connected TV
If you’re one of those people who has to have the latest, most up-to-date features the moment they are available, you can 
check for updates as often as you want.
To check for updates, navigate to Settings > System > System update, and then select Check now. Your T V responds either 
with a message saying that your TV is up to date, or with a message saying that an update is available. 
Follow the instructions on the screen to install the system update.
Getting updates on a non-connected TV
If your TV is not connected to the Internet, you can still get system updates by using a USB flash drive and a computer with 
an Internet connection.
To get a system update, navigate to Settings > System > System update:
 
The System update screen on a non-connected TV gives you the opportunity to connect your TV to the Internet to 
automatically receive updates. We recommend this option if it is possible in your situation. To proceed, select Connect to 
the Internet and follow the instructions in But what if I didn’t connect my TV? on page41.
Otherwise, if you can’t connect to the Internet, select I can’t connect, and then follow the instructions on the screen. Here’s 
a summary:
1On an Internet-connected computer, go to the web site displayed on the System 
update screen.
2On the USB Update web page, select the correct brand and model and then click 
Download. Save the file to the root folder of a standard USB flash drive.
3When the download finishes, take the USB flash drive to your TV and plug it into 
the USB port. When you do, your TV validates the files on the flash drive and 
displays a 12-digit code. 
4Write down the code and the web address, and take this information back to 
your Internet-connected computer. 
Note
Sometimes system updates install new system software, and other times they install 
new features for streaming channels. Therefore, you won’t always see a change in the 
behavior of your TV after a system update.
USB flash drive
Any normal USB flash drive will work, 
provided it has a FAT-16 or FAT-32 file 
system format. ( This is the default for 
most flash drives.) 
The size of the download is 
small-usually less than 100 MB-and 
so will fit on any size flash drive you 
might have. 
						

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5On the 12-digit code page, enter the code your TV displayed, and then click 
Next.
6On the 6-digit code page, write down the 6-digit code that appears, and then 
take it back to your TV.
7Using your T V remote control, select Next to move to the next screen, and then 
use the on-screen keyboard to enter the 6-digit code. When finished, select OK. 
The system update begins. Do not remove the USB flash drive until your TV 
restarts.
When the update finishes, your TV restarts. You can check the new version number by navigating to Settings > System > 
About.
Other devices
Screen Mirroring your phone or tablet
Your TV has a feature called screen mirroring that lets you mirror your compatible smartphone or tablet on your TV. Share 
videos, photos, web pages, and more from compatible devices. This screen mirroring feature is in a 'beta' period, which lets 
you try it out and allows Roku to learn what needs to be improved—so don’t be surprised if it doesn’t work perfectly.
For information on which devices may work with screen mirroring and instructions on how to use it, see 
https://support.roku.com/hc/en-us/articles/208754928-Roku-screen-mirroring-overview
Getting and using the Roku mobile app
Roku makes the Roku mobile app free for compatible iOS, Android, and Microsoft Windows 8/8.1 devices.
With the Roku mobile app, you can control your TV, find and add new Roku Channels, more easily search and find something 
to watch, and even use your voice to search without typing. More information can be found by going to 
http://support.roku.com/home and searching for “mobile app.”
Using a universal remote
In many cases, you can program your cable or satellite universal remote control to also control your TV. You will need to have 
instructions for programming the remote control handy. Check with your cable or satellite provider for instructions.
For details on how to set up your TV to work with universal remote controls, visit www.roku.com/universalremote.
Maintaining
• Do not use your TV in areas that are too hot or too cold, because the cabinet may warp or the screen may malfunction. 
Your TV works best in temperatures that are comfortable to you.
• Storage temperatures are 5° to 113°F (-15° to 45°C).
• Working temperatures are 41° to 95°F (5° to 35°C).
• Do not place your TV in direct sunlight or near a heat source.
Cleaning your TV cabinet
Clean the cabinet with a soft, lint-free cloth. If the cabinet is especially dirty, moisten a soft, lint-free cloth in a weak 
detergent solution, squeeze the excess moisture from the cloth, then wipe the cabinet with the cloth. Use a clean cloth to 
dry the cabinet.
Cleaning your TV screen
Clean the screen with a soft, lint-free cloth.
Notes
• Many features work with top mobile devices. Please see 
https://support.roku.com for compatibility information.
• Your T V must be connected to the Internet and linked to a Roku account to use 
screen mirroring. The Screen Mirroring option is not available on non-connected 
TVs.
12- and 6-digit codes
The USB update process uses a pair 
of codes to validate that you are 
authorized to install an update, and 
to ensure you are not attempting to 
install an old, unsupported version of 
the system software. 
						

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LC-43LB371U/LC-50LB371U 43"/50" 1080p, 60Hz, LED Sharp Roku TV
Troubleshooting
FAQ
For the latest answers to Frequently Asked Questions, visit Common Questions section of the 
http://www.sharpusa.com/manuals/hd.aspx and the Support section of the Roku website (www.roku.com).
Video and audio
Warning
Do not try to repair your TV yourself. Contact authorized service personnel.
Note
If the problem is not solved by using these troubleshooting instructions, 
turn off your TV, then turn it on again.
SymptomPossible causeTr y t h is .. .
Picture does not 
fill the screen or 
there are black 
bars around the 
pictureThe picture size may 
need to be adjusted• Adjust the picture size (aspect ratio). See the Picture Size 
option in Advanced picture settings menu options on page51.
I don’t see a 
picture when I 
select an inputTV is not on
• Make sure that your TV is plugged into a working power 
outlet, and that your TV is turned on. (Your TV had a light on 
the front that indicates if your TV is turned off. See Status light 
on page45.)
Cables are not 
connected correctly• Make sure that the video cables are connected correctly and 
securely to your TV.
• Make sure that the antenna or cable TV is connected correctly 
and securely. See Connecting a cable or satellite box on 
page15 or Connecting an antenna or cable TV (no box) on 
page18.
Picture settings may be 
incorrect• Adjust the contrast and brightness. See the TV brightness 
option in Settings menu on page49 or Options menu on 
page50.
• Adjust the T V picture. See Advanced picture settings on 
page51.
Incorrect input may be 
selected• Make sure that the correct input is selected for the device you 
want to view. See Switching TV inputs on page46.
Input source not 
detected• Make sure that the device connected to the input is turned on.
• Make sure that the cord to and from the device is connected 
firmly and correctly to the device and your TV.
TV input may be bad
• Connect a different device to the same input and check to see 
if it works correctly.
TV channel 
does not appearBroadcast TV may be 
experiencing problems 
or may not be set up • Try another channel. The station may be experiencing 
problems.
• Make sure that the incoming signal is compatible.
• If you are trying to watch broadcast TV, make sure that 
Antenna TV is set up. See Setting up Antenna TV on page41. 
						

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Dark, poor, or 
no picture 
(screen is lit), 
but sound is 
goodBroadcast TV may be 
experiencing problems 
or may not be set up• Try another channel. The station may be experiencing 
problems.
• If you are using an antenna and the signal strength is low, 
adjust the antenna or use a highly directional outdoor antenna 
or set-top antenna with a built-in amplifier.
Cables may not be 
connected correctly• Make sure that the antenna or cable TV is connected correctly 
and securely. See Connecting a cable or satellite box on 
page15 or Connecting an antenna or cable TV (no box) on 
page18.
• Make sure that the video cables are connected correctly and 
securely to your T V.
• The video cable(s) you are using may be bad. Try a new set.
Picture settings may be 
incorrect• Adjust the brightness. See the TV brightness option in 
Settings menu on page49 or Options menu on page50.
• Change to a different picture mode. See the Picture mode 
option in Options menu settings on page50 or Advanced 
picture settings menu options on page51.
No color, dark 
picture, or color 
is not correctPicture settings may be 
incorrect• Adjust the contrast, color, and brightness settings. See the TV 
brightness option in Settings menu on page49 or Options 
menu on page50.
Broadcast TV may be 
experiencing problems• Try another channel. The station may be experiencing 
problems.
• If you are using an antenna and the signal strength is low, 
adjust the antenna or use a highly directional outdoor antenna 
or set-top antenna with a built-in amplifier.
Cables are not be 
connected correctly• Make sure that the antenna or cable TV is connected correctly 
and securely. See Connecting a cable or satellite box on 
page15 or Connecting an antenna or cable TV (no box) on 
page18.
• Make sure that the video cables are connected correctly and 
securely to your T V.
• The video cable(s) you are using may be bad. Try a new set.
Only snow 
(noise) appears 
on the screenBroadcast TV may be 
experiencing problems 
or may not be set up• Try another channel. The station may be experiencing 
problems.
• If you are trying to watch broadcast TV, make sure that 
Antenna TV is set up. See Setting up Antenna TV on page41.
• If you are using an antenna and the signal strength is low, 
adjust the antenna or use a highly directional outdoor antenna 
or set-top antenna with a built-in amplifier.
Cables may not be 
connected correctly• Make sure that the antenna or cable TV is connected correctly 
and securely. See Connecting a cable or satellite box on 
page15 or Connecting an antenna or cable TV (no box) on 
page18.
Picture quality is 
good on some 
channels and 
poor on others. 
Sound is goodBroadcast signal may be 
weak• If you connect to cable without a set-top box and experience 
poor picture quality, you may need to install a set-top box to 
improve signal reception and picture quality. Contact your 
cable T V provider about upgrading to a set-top box.
SymptomPossible causeTr y t h is .. . 
						

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LC-43LB371U/LC-50LB371U 43"/50" 1080p, 60Hz, LED Sharp Roku TV
Dotted lines or 
stripes appear 
on the screenCables may not be 
connected correctly• Make sure that the antenna or cable TV is connected correctly 
and securely. See Connecting a cable or satellite box on 
page15 or Connecting an antenna or cable TV (no box) on 
page18.
• Make sure that the video cables are connected correctly and 
securely to your T V.
• The video cable(s) you are using may be bad. Try a new set.
Broadcast signal may be 
weak• If you are using an antenna and the signal strength is low, 
adjust the antenna or use a highly directional outdoor antenna 
or set-top antenna with a built-in amplifier.
• Other devices (for example, a surround sound receiver, 
external speakers, fans, or hair dryers) may be interfering with 
your TV. Try turning off one device at a time to determine 
which device is causing interference. After you have 
determined which device is causing interference, move it 
further from your TV to eliminate the interference.
Double images Broadcast signal may be 
weak• If you are using an antenna and the signal strength is low, 
adjust the antenna or use a highly directional outdoor antenna 
or set-top antenna with a built-in amplifier.
• If you are using an antenna and the signal strength is low, 
switch to a cable or satellite box.
The picture has 
a few bright or 
dark spotsThis is normal in LED TVs
• A few bright or dark spots on an TV screen is normal. It does 
not affect the operation of your TV.
Good picture, 
but no soundVolume is down or 
muted• Increase the volume.
• Make sure that the sound is not muted.
Headphones may be 
connected• Make sure that you do not have headphones connected. When 
headphones are connected, no sound comes from your TV 
speakers.
TV speakers may be 
turned off• If you want sound to play through your TV speakers, make sure 
that your TV speakers are turned on. See Turning off the 
speakers on page65.
You may need to change 
the audio mode• Change to a different audio mode. See Changing the audio 
mode on page65.
Home theater system, 
sound bar, or external 
speaker system may not 
be turned on or may not 
be set up correctly• If you are using a home theater system, sound bar, or external 
speaker system, make sure that it is turned on and is not 
muted and that it is set to the correct source.
• If you connected an ARC audio device to the HDMI1 (ARC) 
jack, make sure that you have turned on the ARC feature. See 
the HDMI ARC option in Setting up a digital audio connection 
on page65.
• If you are using a home theater system, sound bar, or external 
speaker system and have connected it with a digital audio 
cable, see Setting up a digital audio connection on page65.
• Make sure that the audio cables are connected correctly and 
securely to your T V.
Bad content, no audio• Make sure that the selected channel or content is intended to 
be broadcasting with sound.
Cables may not be 
connected correctly• Make sure that the antenna or cable TV is connected correctly 
and securely. See Connecting a cable or satellite box on 
page15 or Connecting an antenna or cable TV (no box) on 
page18.
• The audio cables you are using may be bad. Try a new set.
SymptomPossible causeTr y t h is .. . 
						

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 LC-43LB371U/LC-50LB371U 43"/50" 1080p, 60Hz, LED Sharp Roku TV
Remote control
Poor pictureLight in the viewing area 
may be interfering• Make sure that the room is not too bright. Light reflecting off 
the screen can make the picture difficult to see.
A connected camera or 
camcorder may be 
interfering• If an S-VHS camera or a camcorder is connected while another 
connected device is turned on, the picture may be poor. Turn 
off one or more devices.
Audio noise Other devices may be 
interfering• Other devices (for example, a surround sound receiver, 
external speakers, fans, or hair dryers) may be interfering with 
your TV. Try turning off one device at a time to determine 
which device is causing interference. After you have 
determined which device is causing interference, move it 
further from your TV to eliminate the interference.
After images 
appear• Do not display a still image, such as a logo, game, or computer 
image, for an extended period of time. This can cause a 
permanent after-image to be burned into the screen. This type 
of damage is not covered by your warranty.
SymptomPossible causeTr y t h is .. .
My TV doesn’t 
turn on using 
the remote 
control No power to TV
• Make sure that the power cord is correctly connected to both 
your TV power connector and power outlet. See Connecting 
power on page30. You should see an LED in the front of the TV 
panel when a button on the remote is pressed. If you see no 
LED activity, try another outlet or check your fuse box.
Line-of-sight obstructed 
• Make sure that no objects (or pets) are obstructing the 
line-of-sight from the remote control to the remote sensor on 
the front of your TV. See Aiming the remote control on 
page31.
Remote not responding
• Open the battery compartment and make sure that the 
batteries are seated in the correct positions (+ and - in the 
correct positions). See Installing remote control batteries on 
page31.
• Make sure the batteries are fresh and working correctly. 
Replace the batteries, if necessary.
TV frozen
• If the front LED is not responding, or abnormally bright, 
disconnect the power cord from power outlet, wait a few 
seconds, then reconnect the power cord.
Trouble 
programming 
your existing 
universal 
remote controlRemote control may not 
be programmed 
correctly• See instructions in Using a universal remote on page69. For 
instructions on programing a universal remote control, visit:
www.roku.com/universalremote
• Refer to the User Guide that accompanied your universal 
remote control and contact the manufacturer if problems 
persist.
Batteries may be dead
• Replace dead batteries with new batteries. Refer to the User 
Guide that accompanied your universal remote control.
SymptomPossible causeTr y t h is .. . 
						

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LC-43LB371U/LC-50LB371U 43"/50" 1080p, 60Hz, LED Sharp Roku TV
General
SymptomPossible causeTr y t h is .. .
No powerPower cord may not be 
connected correctly• Make sure that the power cord is correctly connected to both 
your TV power connector and power outlet. See Connecting 
power on page30. You should see an LED in the front of your 
TV panel when a button on the remote is pressed. If you see no 
LED activity, try in another outlet or check your fuse box.
• Unplug the power cord, wait 60 seconds, then plug the cord 
back in and turn on your TV.
Other devices may be 
interfering• Other devices (for example, a surround sound receiver, 
external speakers, fans, or hair dryers) may be interfering with 
your TV. Try turning off one device at a time to determine 
which device is causing interference. After you have 
determined which device is causing interference, move it 
further from your TV to eliminate the interference.
My TV tuner 
does not pick 
up as many 
over-the-air 
channels as it 
shouldAntenna may not be 
placed optimally• Adjust the antenna location and rescan. See Scanning for 
broadcast TV channels again on page65. 
Go to Settings>Input.
• Reception can vary by channel depending on the broadcast 
power level of a given station. Contact your cable or satellite 
TV provider. 
• Make sure that the antenna or cable/satellite TV is connected 
securely to your T V. 
• Try replacing the cable between the antenna/cable or 
cable/satellite box and your TV.
Broadcast TV may not be 
set up• Make sure that Antenna TV is set up. See Setting up Antenna 
TV on page41.
One or more 
channels do not 
displayChannels may be 
blocked or hidden• Make sure that the channels are not blocked. See Blocking 
unrated programs on page61.
• Make sure that the channels are not hidden. The channel may 
have been deleted from the channel list. You can add the 
channel back to the channel list. See Edit broadcast TV channel 
lineup on page57.
The wrong input may be 
selected• Make sure that you have selected the correct input tile for the 
device or service you are trying to use. See Switching TV inputs 
on page46.
You may need to use the 
remote control that 
came with the cable or 
satellite box• If you are using a cable or satellite box, use the remote that 
came with that box to change channels.
I lost my 
parental control 
PINNeed PIN recovery • You will need to factory reset your TV, as the PIN cannot be 
recovered or reset any other way. See Factory reset everything 
on page67. 
Go to Settings>System>Factory reset.
Some settings 
cannot be 
accessedNot all settings are 
available for all devices 
or inputs• If the   icon or a menu option is grayed, you cannot adjust 
settings for the current video input mode.
TV cabinet 
creaksThis is normal
• When your TV is in use, the temperature rises naturally and 
may cause the cabinet to expand or contract which can cause 
a creaking noise. This is not a malfunction.
Control buttons 
do not workTV may be frozen
• Unplug the power cord, wait a few seconds, then plug the cord 
back in and turn on your TV.
TV keeps 
turning offSleep time may be 
turned on• Make sure that the sleep timer is not turned on. See the Sleep 
Timer option in Options menu settings on page50 or 
Changing time settings on page64. 
						

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 LC-43LB371U/LC-50LB371U 43"/50" 1080p, 60Hz, LED Sharp Roku TV
Roku
Network
Some features 
are not 
availableThe wrong TV mode may 
be selected• You may have Set up for store mode when you set up your 
TV. Store use mode is for retail environments only. In Store use 
mode, some of your T V’s features are missing or limited. If you 
selected Set up for store use and you want to change to Set 
up for home use, you have to reset your TV to the factory 
defaults. See Factory reset everything on page67. 
Go to Settings>System>Factory reset.
SymptomPossible causeTr y t h is .. .
I can’t turn my 
TV on with the 
Roku mobile 
appYour TV is “asleep”
• You will need to use the physical remote button to “wake up” 
or turn on your TV.
I can’t find my 
TV with the 
Roku mobile 
appTV and mobile app not 
on same wireless 
network• Make sure that your TV and the mobile app are on the same 
network.
TV not powered or 
working normally• Make sure that your T V is connec ted to a working power outlet 
and that your TV is turned on. See Connecting power on 
page30.
I cannot screen 
mirror to my TVTV on older software
• Always keep your TV updated. See Getting system updates on 
page68.
Go to Settings>System>Software update.
Mobile device not 
supported• Screen mirroring is a beta feature currently, so a select set of 
devices will work.
SymptomPossible causeTr y t h is .. .
I cannot 
connect to the 
InternetNetwork connection 
may not be set up• If you did not connect to the Internet when you first set up 
your T V, see But what if I didn’t connect my TV? on page41.
Network name or 
password may have 
changed• If your network name or password had changed, you need to 
update your network connection. See Changing network 
settings on page63.
Streaming 
keeps pausing 
to load more 
dataWireless LAN not 
optimized• Rotate wireless router slightly
• Elevate the router
• Turn off other wireless connections
• Use 5.0Ghz, if possible. Roku TVs supports dual band.
Insufficient broadband 
speed• Turn off other wireless connections that may also be using 
bandwidth.
SymptomPossible causeTr y t h is .. .