I have a TH-PX25 television that I purchased in 2004. Input is an antenna. Signal strength is good (about 90). After about 1 year, the picture would become eratic on occasion, and blank out all together, including the sound, sometimes. The problem occurred more frequently over the years, and now I rarely get a picture to remain for more than a couple of hours. At one point I changed inputs from the A port to the B port and that reduced the frequency of the problem, but now both ports are bad. Meanwhile, the picture-in-a-picture works just fine.
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Purchase your UHF/VHF antenna. The antenna can also be purchased at most electronic and retail stores. Consult your list from Step 1 and see how powerful the over-the-air signals are for your specific address. Purchase your antenna based on the broadcasting power you need to receive a clear picture on your TV. You might be able to get away with an indoor antenna if your signal strength is strong enough. If not, you'll need to purchase an outdoor antenna.
4 Install your antenna (or have it done professionally) according to the building codes of your area. If you must use an outdoor antenna, it is a good idea to have the antenna professionally installed. This ensures that it is properly grounded on your roof, not too close to electrical wiring and stable during inclement weather.
5 Hook the converter box up to your television using the cable that came with it (F Cable). Hook your antenna up to the converter Box. Turn on your TV and converter box. Tune your TV to channel 3 and press "Scan" on the digital convert box. Allow the box to scan for your available channels.
6 View your picture and adjust your antenna accordingly for the clearest over-the-air feed. You should only need to make adjustments once. If you are having a difficult time getting a clear picture, use a signal strength indicator to see where you receive the most powerful signal.
Tune to a strong channel. Go into the menu. Find the Channel or Antenna whatever your tv calls it. Set the signal strength display.
If the signal strength show good and your picture is lost then a problem may be in the tv. More than likely the antenna is not picking up a strong signal. Try rotating it some.
You can go to www.tvfool.com to see what stations are in your reception area.
for Tvs have larger viewing areas, yagi outdoor antenna is the best. With a telescopic indorr antena, although it will work, but there will be some snow in picture, and some interferance, which will be noticable with large screens. Moreover yagi antenna is best for good signal strength and choose an antenna which ahs larger number of cross bars, as it will rise the strength of signal as well as clarity of the picture. Ok
What is your TV input connection? Are you using Antenna? Cable? Dish?
The Unusable Signal sounds like the TV is not getting a signal. Does your TV have a built in HD Tuner?
If you are using Antenna you might want to try setting up the connections and it should search for quality channels that you get good signal strength. If you are on channel 2 and there is no over the air channel 2 it may say "unusable signal".
newer television sets employing hd or digital require good antenna signal strength to allow the sound to come on.
there is an auto muting device built into the set so as if the picture is at all snowy it will mute the sound.
what you can do however with this set is to enter service mode and there is an option that you can change that will disable this muting aspect of the television.
The reason why a lot of sets have this option is to prevent damage to speakers.