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Check and replace the main digital processor board. Contact any service technician. If you wish to get more details, check this link. http://electronicshelponline.blogspot.com/ Selecting the view option, either to Mosaic
/ Time slide, can be selected by the drop-down list, at the top left
of the display window, will make surf easy. You can also do a search, by type in the brand name/model
number/IC used, in the search box at the top right of the display window.
I had the exact problem and couldn't do the factory reset or another reset that a Westinghouse tech told me to do over the phone - BUT I FIXED IT! This is what I did. With the TV facing me and power on and connected to my cable antenna (like normal - ready to watch TV) I took my right hand and started pressing all different buttons on the side of the TV in different order at random. All of a sudden the big W came on the screen so I called back Westinghouse technical assistance and she told me go to menu - then TV - then scroll down to channel search. Since all my cable channels are on channel 3 on the TV - the search found that channel and the picture and sound came on and works fine!
Had this problem also when I rebooted my Time Warner Cable box. Unplug everything from the wall including power strip and wait 60 seconds then plug back in and turn everything back on. Worked for me and havent had a problem since. Time Warner does not know what causes this yet.
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.