The signal and picture is fine when I run normal digital satellite thru the TV but when I converted to a HD converter box I lose the convergence. I tried different 3 prong connectors but it did not help. The DVI cable that came with the converter box is not compatible with the female plug in the back of the TV.
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This televison is HD ready in the fact that it can produce and HD picture. But, you will need to have and HD tuner source or a converter box to get HD signals.
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Who was not watching the months of public service announcements? You need a Digital-to-Analog (ATSC-to-NTSC) converter box to receive over-the-air (OTA) signals in most parts of the country. You do not need one for most cable and satellite box outputs--they are NTSC or HDMI. Some low-power, typically religious, stations are still analog. Note OTA may be high definition (HD) or standard resolution (SD) but will be digital.
To get HD on your HD set you must have OTA (HD TV tuner, not converter), cable (QAM TV receiver), satellite (HDMI or 5-wire RCA),or Blu-Ray with HDMI or RCA.
This TV will need a converter box. It was made in the days before the digital tuner was required on big TV sets.
Just remember the converter is only needed if you get off-the-air reception with an antenna for local channels. If you have cable or satellite and get your local channels that way, you don't have to do anything. The change to digital will not affect you.
If you are now using rabbit ears or an old worn-out outside antenna, you might think about upgrading your antenna when you get a converter box. Signal strength is very important with the new digital broadcasting. Too weak a signal means no picture at all or one that freezes up or turns blocky. The antenna that worked for analog may not be adequate for digital.
Have you tried selecting a different input( do you have the remote?), if so have you set your input to accept HD input ( you access this thru your 'Menu" button on your remote). I run my HD input from my game console (X-Box 360) and have to select HDTV input channel (there are 2 of them along with 2 cable inputs), and have not had a problem with this at all. good luck.
More information is required to properly troubleshoot this problem. How is your television connected when you are watching HD? Do you have HDMI for this, do you have a satellite or digital cable box? For analogue are you using regular coax antenna (cable TV), or are you going through a cable or satellite box?
This could be related to the aspect ration setting. perhaps you ahve changed your aspect ratio from 16:9 to 4:3 or some other setting. If you are connected via HDMI, then the digital signal may be "normalizing" your picture during HD, but reverting back to the other setting.
Check you video settings very carefully. HD televisions are very difficult to tweak properly.
The Scientific Atlanta box was a cable box and recieved CATV signals. The Direct TV box is satellite only. You might check if it has a built in ATSC tuner for off air digital signals. Direct TV in most locations offers the major networks in HD format.