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select cable as a source not broadcast its looking for UHF channels instead of cable up to say 100. go to setup select cable not antennea or broadcast. do a scan afterwards and ghave it find your channels
There has to be a signal on one channel at least below 50. connect a DVD player to the TV and try programming. You are supposed to have a signal on cahnel 3 or 4.i hope this helps you. thats all I can think about now.
Sounds like a problem with the tuner in your set. Probably not an
economical repair. What you can do is if you have a VCR kicking around,
connect it to one of the video inputs on the back of the set and run
the cable into the VCR then set the TV for the appropriate video input
and tune in the channels with the VCR.
Oh, and I kinda like the pun.
there are two things that can cause this, 1 there is a muting transistor on the bottom of the PCB that is a surface mount transistor that goes short. this is the channel mute transistor. when you change channels it is designed to mute the static between channel changes. if it shorts then it mutes. 2 the EE-PROM is defective and needs to be replaced. i'de go with the transistor first. if you are unequipped to do this repair have a tech do it.
Try going into the setup menu and make sure the ANT input is set to cable. Then look for Auto Program or Channel Setup and let it scan and find all the channels it can receive. After it's done you should be able to go up and down through the channels.