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Some TVs switch faster than others, plain and simple. I went from a Sony LED to a Sanyo LCD TV and there's a world of difference between the two in terms of how quickly each powers on and how fast one channel goes to the next after inputting the channel number on the respective remotes. The Sony is lightening fast compared to the Sanyo. I have a Phillips LCD in a bedroom that takes a long time as well, like the Sanyo. Personally I think you get speed with either the LED (over the LCD) and/or it's related to the quality and associated price you've paid.
This is the best solution for your problem as a 40 year experience with wires etc.
Go to the source of your cable signal connector .
Open it and clean the terminals with emery paper , sand the end of the cable shiny clean from corrosion , get a new barrel connectors with gold terminals if possible lengthen the ends of the cable , insert and tighten good, use thick rg-16 or rg 40 cable with good insulation ends crimped professionally with a crimpier or buy ready made , not from dollar store. Get a gold plated professional splitter if you need one or two , it will cost about 15 or more each . Make the cable runs as short as possible, using the thick good cables. If needed get a signal magnifier. From radio shack or the source etc. Connect them good and tight . Ground the splitters . Problem solved , you will get crystal clear channel 2 to 7 including 3 and 4 . Isolate the TV cable from other cables and power wires.
Sounds like you mabe be on the wrong source. Try hitting the input button on the side of the set to change inputs. Input channel up or down find tv hit input again. If on the wrong input you will only get a blue screen and message no signal that will apear for a few seconds.
it sounds like your IR board is going out, its easy to replace and is inexpensive usually about 10.00 plus tax and shipping, and very easy to install, its one of the few parts you can buy for these models outside of the 479.00 dollar control box.