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Thank You Matt, This is not an enhanced set. So your friend couldn`t have changed the aspect ratio.
That unfortunately leaves you with a problem in the vertical circuits of the chassis .There is a capacitor going bad. I recommend you take it to your repair shop. First ask for an estimate before you decide you want to repair it. There are no expensive parts involved. Mostly service and labor charges.
The picture on your TV is created by an electron gun firing at the phosphor coating on the screen. The position of the guns beam is controlled by magnetic coils, which are driven by scan circuitry.
Normally, the gun scans left to right, top to bottom to create each single frame of the moving image.
From what you are saying, it sounds like there is a fault in the vertical control system somewhere - basically the gun is going left to right but not up and down, resulting in your picture being squashing down to one row high!
It is unlikely to be a fault with the magnetic coils. My guess would be a faulty resistor that is breaking down (and changing its value) as it gets hot.
It should be a relatively easy to fix, but given the age/value of the TV it might be worth considering a replacement.
To properly diagnose this problem,access to
the servicer menu will be important.Also,the
service literature for the horizontal and vertical circuits may be needed.Contact a tech
who can help you that is familiar with Durabrand.
If you mean that a black box appears on the screen, and you can still see the picture around the box, it means that your closed captions are on and set to TEXT. If this is the case, enter the menu, navigate to the closed captions page and set the captions to OFF. If you mean that the top of the picture has collapsed down, the vertical circuit has stopped working correctly and the set should be serviced by a qualified tech.
The vertical circuit is going bad,this is the one in charge of opening the picture up and down,try taping on the side to see if the picture reacts ,if it does your set has a loose conection and the vertical IC will need to be resoldered only but if it does not react the IC will have to be replaced,if you are familiar with tv service this will give you a place to start but if you are not be safe and seek the help of a servicer,please let Us know how it goes.