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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Low input signal strength, due to poor antenna connection; defective tuner, improper orientation of the antenna; etc; might cause a snowy picture.
If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
If the transmitter is so far away, it too can be the cause, as the signal falls at the antenna to be low. If this is the case, connecting a signal booster; between the TV set and the antenna will give better result.
If you have a good picture on some channels and the picture breaks up on others , it could be the input signal. What is the source of the input signal; i.e. cable, satellite, antenna???? Do you have a cable box? The problem may be with the box or with the provider's signal.
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.
What is the source for the TV? If it is OTA, then what size antenna do you have and is it pointed in the direction of the signal? Is it an indoor or outdoor antenna? If it is an outdoor antenna, check if it turned in the wind. Are there tall trees or large buildings blocking your signal?
Antennaweb.org and tvfool.com are good sources for the antenna direction - just plug in your address. tvfool.com gives a range of stations, their signal strength and direction with notes for the appropriate antenna for receiving the stations. Antennaweb is much more conservative in the station list and assumes an outdoor antenna.
If your signal is split to feed several devices or just marginal, you may need an amplifier in the system. (A bi-directional amplifier may be needed for cable or satellite) This corrects somewhat for the loss in signal from the splitter and sometimes brings in the weak signal.
If the signal loss is intermittent, it could be related to the weather or a large flock of birds.
I hope this helps.
Cindy Wells (digital signals are either strong enough for the tuner or you get the pixelation and freezing until the signal comes in more clearly)
Did you use an inside or outdoor antenna? An outdoor antenna rotated in the correct direction will give you the best chance of getting any signal. Look at antennaweb.org and tvfool.com for the channels in your area, the direction in which the antenna must be pointed and the type of antenna you will need to get them. Antennaweb.org is very conservative in the channel listings even with the assumption of an external antenna. Do you have hills, trees or tall buildings between you and the various transmitters? That will block your signal strength - remember digital TV is an all-or-nothing signal.
I hope this helps.
Cindy Wells (antennaweb indicates that my location will only get 2 channels from a transmitter 10 miles away. With a properly oriented outdoor antenna and an splitter/amplifier, I actually get those + 3 from 30 miles away on several TVs without signal loss..)
wow. mostly all new set from the last few years have a dual tuners NTSC and ATSC and that would depend if or which set will get the better signal. Also remember that off air is analog and the sets are now design for digital.