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Sounds like you have lost video somewhere in the video circuits. Possibly the picture tube could have gone bad or lost filiament voltage. You can check to see if you have high voltage by holding your bare arm close to the screen. The hairs will stand up if you have high voltage. Absence of high voltage will also cause a black screen,but the sound might not work either since on some sets the power for the sound is supplied from the same circuit as the high voltage.
Yes the sound is lost when picture goes out. Found it was the power supply overheating - I cleaned it (dust caused the overheat) and it has been working for about a month but I anticipate having to replace the power supply soon.
You can change the way the channels can be displayed/viewed by a video setting, consult manual. When pic breaks into pixels and sound goes it's usually a reception problem so you'll have to adjust the antenna facing a direction that makes that channel come in clearly. It helps to experiment with positions and antennas.