Quote:
Originally Posted by Jon F
Tried this but could not get it to work. Do I need to remove the over the air signal wire and replace with composite on pin 1? I just soldered composite signal to pin 1 and ground to ground
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Jon-
There may be more to it than I made it sound like, as I just looked at the schematic diagram again. Yes, disconnecting the signal from the IF/detector circuit is likely needed, especially to eliminate those circuits (and the earlier tuner/IF stages) as a possible source of noise. However, I am not an engineer enough to know for sure if it will be that simple. At the least, I would recommend using an oscilloscope to look at the video signal that is there from the tuner/IF now; it could be more than the one volt that is standard from DVD players and so on, and it could even be inverted polarity. I will do such tests when I try that type of connection, and also, I have a couple of video test-signal devices (Sencore VA62, B&K 1077) that can output variable-voltage video signals as needed.
Oh, and thanks for quickly posting the TS-4D schematic link for old_tv_nut.
I have a question for you, as well: When you replaced the mica capacitors, does that include the two 900pF ones (c137 and C138 on that schematic, I think) that connect between the horizontal sweep signal outputs and ground? I think they are rated at 1000 or 2000 volts, large "domino"-type capacitors in my chassis. That is on my list of suggested possible fixes, but if you already tried them without success, they would likely not fix my set either.