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Hisense 55U88N Manuel D'utilisation page 56

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Troubleshooting
Check whether TV Speaker is selected at  
  > Settings > Display & Sound > Audio Output > Audio
Output.
My TV cannot connect to the network.
Check network status at  
  > Settings > System > About > Status.
Make sure your modem/wireless router is on and connected to the Internet.
Position your wireless router, modem router, or access point in a central location. Avoid putting it in a corner.
External source connected but no picture or sound.
I have connected an external source to my TV but I get no picture and/or sound.
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