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How is your TV setup--do you have a cable box, satellite, or basic cable? I would recommend going into the settings and running a channel search.
Press Menu. The on-screen display menu options with Setup highlighted. Press RIGHT arrow to enter the sub-menu, then press DOWN or UP to highlight AUTO CH SEARCH. Press ENTER or RIGHT arrow to start the search.
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
Most remote controls have a "display" button. Pressing that is what gets that channel number on the screen. Try pressing it again and the display should turn off. On some brands the display may cycle through various combinations (channel number only, channell and time, etc.) before it goes away, so it may take more than one press of the button.
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.
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.