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Normally, when I see this problem in the customer's home, I find the main culprit to be the cable or satelite receiver box.
The remote for the cable box may have a button on it to change the format or picture size.
You may have to go into the menu of the cable box to change the format setting.
Hope this helps.
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You have a problem inthe horizontal deflection circuit. Quite possibly a solder connection around the yok plug connection or the horizontal output transistor or Driver transformer. If the solder looks good. You will need a service manual so you can check your various power supplies. You can get a manual at the following link for 10.99 and they also offer free support. They willals email it to you if you return to the site and request that they email it instead of mail. Hope this helps. Here is the link. http://servicemanuals.vstore.ca/