Samsung

Samsung QA55QN90DAK

Answers and step-by-step fixes from the official Samsung manual.

What does the message on the screen say?

• "Weak or No Signal": The TV can't find a signal or channel. This shows up in TV mode when the broadcast signal is weak or no channel can be found.
• "Mode Not Supported": The connected device's video format isn't supported. This appears when the output resolution of a connected device isn't one the TV can display.
• "Format Device": The storage device needs to be formatted. This appears when you try to use Timeshift or recording with a storage device that isn't formatted for the TV.
• "Updating Completed": The channel list has finished updating. This confirms the TV has finished reading the CI or CI+ card and updating the channel list.

Common problems

There's no sound, or the sound is too low

1. Is Sound Output set correctly? Check the Sound Output setting. If it is set to TV Speaker, check the volume setting.
2. Is the volume turned up on both the TV and the device? Check the volume control of your TV, and then check the volume control of the external device connected to your TV.
3. Is the cable connection secure? Check the cable connection between an external device and the TV, and then try the connection again.
4. Have you rebooted the connected device? Reboot the connected device by disconnecting and then reconnecting its power cord.

The picture is flashing, dark, or the colours look wrong

1. Are energy-saving picture features turned on? Disable Brightness Optimisation, Energy Saving Solution, Motion Lighting or Contrast Enhancer.
2. Does the Picture Test show a problem? Run Picture Test. When the tested image quality is normal, check the signal of the connected device.
3. Is the picture too dim? If the screen appears too dim, try changing the settings under Reset Picture.
4. Are the colours black and white or off? Launch Picture Test, and check whether Greyscale is set to On.

The TV won't turn on, or turns off by itself

1. Is Sleep Timer enabled? The Sleep Timer automatically turns the TV off after a specified period of time.
2. Is Auto Power Off or Off Timer enabled? If the Sleep Timer has not been enabled, see if Auto Power Off or Off Timer has been enabled and disable it.
3. Is the power cord connected at both ends? Confirm that the TV's power cord is connected correctly at both ends and that the remote control is operating normally.
4. Is the antenna or cable/satellite box connected? Make sure that the antenna cable or cable TV cable is firmly connected. If you have a cable or satellite box, confirm it is plugged in and turned on.

The TV won't connect to the network

1. Is the network cable connected and the router powered on? Ensure that the network cable is connected and the router is powered on.
2. Have you restarted the router? Turn the router off and back on again. This can take 2 to 3 minutes.
3. Was the security key entered correctly? If a security key is required, make sure it has been entered correctly.
4. Have you restarted the TV? Unplug the TV's power cord and plug it back in, or press and hold the power button for at least 3 seconds.

Step-by-step guides

Update the TV's software

1. Go to Settings, Support, Software Update
2. Select Update Now to check for updates over the network
3. Or save the downloaded update file in the top-level folder of a USB device
4. Connect the USB device to the TV to update
5. Do not turn off the TV until the update finishes

Connect the TV to a wireless network

1. Go to Settings, All Settings, Connection, Network, Open Network Settings, Wireless
2. Make sure you have the access point's name and password ready
3. Select your network from the list, or choose Add Network if it isn't listed
4. Or push the WPS button on your router within 2 minutes