My 65" LG smart tv bought in 2013 is telling me there is no signal. I've changed the batteries in the remote but it had no impact. I can stream Netflix OK. Any advice please?

Check the Source or Input button. You have accessed a source that has no input signal.

No one buys Universal remotes these days, you buy a facsimile remote that is an exact copy of the old one.

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Check the remote control for its infra-red emission. Check it with fresh batteries. Check by pressing all the buttons on it; and see whether all of it generates infrared signal while pressing. If it is found OK, check and replace the infrared sensor inside the TV. If you wish to get some details; check the site linked here. It has details about how to check a remote control; by one among the post. Pull up older posts. If the remote control is found OK; check and replace the infra-red sensor inside the TV. Contact any service technician.
http://electronicshelponline.blogspot.com/
http://schematicscom.blogspot.com/
http://homenol.blogspot.com/
Search the site by type in this key phrase "how to test a remote control "in the "search box at the top right of the display window of the Homepage" to get the related post quickly.
https://www.youtube.com/watch?v=F8oYoZslgbs LG Remote control - Open - Search [How to open LG Remote control]
https://www.youtube.com/watch?v=do41DlsZHmA [ open, battery change Toshiba]
https://www.youtube.com/watch?v=jsSCNCW3IbQ [open and clean]
https://www.youtube.com/watch?v=Qp-l1uh-5gE [open and clean]

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Netflix Streaming problem on LG Smart TV - Forums - CNET

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LG Smart TV YouTube App Crashing/Not working - Google Product Forums

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GoogleMay 20, 2014 - I have an LG Smart TV Model Number 47LM6200. ... TV YouTube App Crashing/Not working, Kevin Wrigley, 5/25/14 8:38 ... Can't even link the TV to the phone/tablet app for a screenshot ... Did it coincide with a firmware update or any other change? ...... I downloaded an update for the LG 47LM7600-TA . Trouble mirroring your Android Screen?
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I change my batteries out about once every 6 months. As cheap as the sticks are perhaps you might consider trying a different kind or just get a smart TV.

This is probably due to poor quality cable or connections from the aerial. Digital TV needs better quality in both (F connectors and quad shield cable) than analogue TV did.

If all that is good then you may need a better aerial or even a signal amp.

Why do you need a roku if you have a smart TV?
Anyways, if you plug the connector into the TV via your HDMI port, it should power on. switch your tv to that input, and then use the remote to scroll through the setup options and find your wifi and set it up. it is a farily simple process

contact google or lg

Let's start simple first. Your TV is not responding to either remote control, but specifically if your factory original LG remote does not operate the LG TV, then the problem could be with the IR receiver in the TV itself.

Ensure nothing is blocking the IR receiver on the TV. Move anything out of the way.

Test both remotes to ensure that they are sending an infrared IR signal to the TV. Use a digital camera (such as the one on your phone) and point the remote into the camera lense and press the power/volume/channel buttons. You should see a faint flashing light in your camera viewfinder. This indicates that the remote is sending IR signal. If you don't see anything, then there is no signal. Try FRESH batteries.

If your remotes are working, and since this is an LG, look at the back of the TV by the video inputs. Look for a port called "REMOTE CONTROL IN" or similar. It looks like a 3.5mm headphone jack. This port is used for external remote control and may be dirty.

UNPLUG the TV, then use a regular 3.5mm male headphone jack to plug in and out several times. You basically want to push all the way in and all the way out several times to dislodge any dust and remove any oxidation that has built up in the port. 10-15 times should do fine.

Then plug in the TV and try your remote.

Best of luck.