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As an past Radio Engineer I feel compelled to tell you that the conversion to HD in FM and TV signals did not do all of us a favor. The coverage pattern of stations has decreased to the level of about 70% due to this new advanced technology. I think what your real problem is comes from a misunderstanding of what a HD TV signal must be supplied from. In my house as an example which is 21 mikes away from Chicago and the Willis building where a lot of TV signals are from, the need to put up a new higher gain $100 HD TV antenna was required. You can get such antennas from Antennadirect web site. You will also require a length of high grade 75 ohm coax cable- I bought the high grade Digital TV cable from Gepco International with a 3 GHz bandwidth and also distribute the signal to a number of TV's either with a Wineguard or Blonder-****** distribution amplifier. My antenna is mounted near 30 feet off the ground. Places like Radio Shack may sell these kinds of indoor TV antennas but they are depending on the lack of knowledge of the people buying them to sell the product. It also depends on how far you are from the source of transmission. If you are 5 miles in a high rise building facing the transmission tower, you might have luck with an indoor antenna, if you are 20 or 30 miles away from transmission you might have to go to more elaborate measures to get a signal down to the TV. There is no magic to it just a need for a person who understands the signal levels and what is needed. I spent time as a Chief Engineer for 4 Radio stations in Chicago as well as was involved in a FM HD installation or two. See if you can find a Television shop that you can ask questions about your installation. They may be able to help you mount a roof antenna if you can not do it yourself.
there is a code to reset the HDMI video, i think it is--hit Display on the remote, then sleep timer and video statice at the same time, then the number 2, then turn the tv off, after it shuts down all the way, turn it back on, should take care of it
i had the same problem and the only way i could solve it was to disconnect power from the tv, let it "reset" then it would be ok for a bit. the problem went away entirely when the cable company updated its software for its hd box. might be coincidence....
also, pre-update, the resolution wouldnt automatically set correctly. If I turned on the tv to a hi def station, it would set to 480 and only set to 1080 when i changed to a normal station then back to the hd. then it was fine. again, after the update from the cable company this went away.
I am not finding anything on the net about being able to upgrade it but the HD in the model # stands for high def but the tv is old enough that it may not go up as high as 1080 most likely just 480i or p which can be achieved with an s-video or might be 720 with the R/B/G connector or a DVI connector, you can look for converting cables on ebay