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I checked the tv last night. When I disconnect the antenna, the bottom of the screen returns to normal while the top is still black, but only about 1/4". Reconnecting the antenna, the problem returns. It's a real pain to setup the oscilloscope at my parents house, so I have to do it the old fashioned way. Trial and error. It appears that when a signal is present, the wave form must be distorted. Perhaps a bad capacitor? Anyone know what the "switch" transistors function is?
TIA
Ron
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