Well tuners are being made smaller (and there is more cold solder in some points due to heat) so i would look up a new tuner for that tv...and if you know how to solder ,do it yourself it will be cheaper
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Check the aerial cable, ensure it is well plugged in and getting signal.
If you are using a receiver box, check cables to TV and receiver (freeview, sat, cable etc.), try setting channels on receiver again, if it does not work but you get static, then either the cables or receiver are defective.
Test the TV on standalone , connecting it to an external antenna. Tune again the channels, and save the preset. If still no signal then the antenna socket on the TV may be defective.
Try using the TV with a DVD.
If you can watch DVDs, and TV is not keeping channels preset, and you tried all the above, at this point htere may be a fault in the tuner card inside tv.
Call the phone number listed on tv user manual to get support, and eventually repair it.
I assume you are using a cable input, such as a box or the main Cable line connected directly to the TV. examine the main Cable Coax, look at the copper wire that sticks out from the connecter, make sure it is long enough, if its to short, gently pull it with a long nose plier until it reaches the rim of the connector. Sometimes when connecting the coax to a source, the copper wire in the coax is to short to make contact, and as a result you get no signal. Hope this solved your problem.
Did the cable person take a reading on the signal level at the cable outlet on the wall and did the cable person check the TV setting to make sure they are correct. TV could be set on the wrong channel also.
There might be a bad (loose) connection in the RF isolator or the tuner (both are silver boxes. Try to unplug the coax and bend the RCA tabs in so that the connection gets firmly made when reconnected. This may help. If it does not The connector may have to be replaced.
Sounds like you've got whats called a cold solder connection somewhere in the horizontal width control circuit or a connection in the sweep section. Should'nt be two expensive but unless you have had some soldering and troubleshooting experience I would leave this on to the pros. Good Luck