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Normally grainy pictures are a result of poor ground connections, although usually for more than one channel. Check the cable connections first. Otherwise all I can suggest is to have the tuner replaced.
Check is RF Antena/ Cable connected? If yes, go to TV Menu and select Auto-Program. TV will start tuning and search all available channels on cable/ on-air. If there is no channel reception, TV has defective Tuner. If you know basic electronics knowledge, replace the Tuner or contact nearest Sony repair shop.
sarge, it sounds like the vertical output IC went bad on you. If it was a bad connection or a bad capacitor, your picture would have been a straght line across the screen. They call the output section of the IC a push-pull type of amp, so the top half of the sweep IC went out. If you have had some soldering experience, and or experience with solid state repair, locating the bad IC and replacing it is no big deal. If you havent, stay safe and call in a pro to assist you in this repair, as there is alot of high voltage inside this puppy that is still present even if the set is unplugged. It should not cost an arm or a leg to repair this set. An honest repair on a set like this if you take it in should not exced 125 to 150 bucks. Good Luck
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That sounds about right my friend. Those sets do have two tuners and Ive seen the problem your desribing. Unless of course that the microprocessor and tuning circuits are goos also. I would call a servicer if I were you unless yopu know your way around the inside of the tv set as it does have alot of High voltage even when its unplugged Good Luck