Quote:
Originally Posted by drh4683
Yes, in these scenarios, its nice having the "good working chassis" to compare voltages. Unfortunately, I gave the other CTC-5 I had to friend and I know the brightness circuit was working properly on that one too. This was actually a problem before I recapped the set, so capacitors are basically eliminated as a cause at this point. I used nothing but the best in the recap (spragues) and I tested them for capacitance and leakage prior installation as reassurance. If I remember correctly (not at home at the moment) the brightness did not go away after pulling the 12BY7 video output. That should be a give away that the problem is elsewhere. I'll find it...eventually.
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When you run into hard to find problems like this it is time get out the oscilloscope. Put the chassis back in, Connect her up and check waveforms.
I would do it with the crt cut off and the brightness problem should stand out. If the problem was there before you did the recap is it possible you missed one? I have done that many times.
One other thing to check, What does the brightness do when you turn the color up and down, Do you see a change in the brightness when you adjust the color level?
I am just throwing ideas at ya and it will be interesting to find out what was wrong with your set.
Ed