Quote:
Originally Posted by Ralph S
I should point out that the set was running on a variac followed by a voltmeter and an ammeter. Just prior to the failure the voltage was 115 vac and the amps were at 2.8. From this standpoint there was nothing out of the ordinary.
On the other hand (prior to the failure) I had just changed the convergence assembly from one that was physically falling apart to one that was mechanically much better. The first one had the early selenium double diodes and the other had the newer block diodes. There may have been a parts failure on the convergence board which could have disturbed the "U" line heading back to the hor. osc. I'll have to check this. (The set ran for about 15 minutes prior to failure with the new assembly.)
Another thing: Trying to rough the newer convergence assembly into static convergence, I had the 3-dot pattern up, so the screen was mostly black. But the dots seemed larger than usual and I went to check focus. The focus control did not seem to do much.... Could this have been a symptom of pending failure?
I hopes this helps you in your sleuthing.
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If the new convergence assembly is from another ctc16 chassis there should not be a problem. If you took it out of a different chassis # then it might cause a problem with the flyback. If the convergence panel is not from a ctc 16 chassis, Put the old one back in. Fix it with the parts from the new one if they are the same value or part #.
Magnavox chassis where known to cause a flyback failure when something went wrong with the focus circuit so that could be what went wrong with your ctc 16 even tho it is a rca.
Watching the total current consumption of the set is a really good idea but if the horizontal output current is high it may not show up as a problem when watching the total current consumption of your set. { If my writing makes sense to you} The best thing to do is check the horizontal output tube current.
The lowest current current reading I get with my ctc16 is between 200 and 202 ma with the ac line voltage set at 117v ac. If you have a sams for your set just look for miscellaneous adjustments and it will tell you how to do it. It is cool watching the horizontal output current. You get to see what is going on when the ac line voltage changes and when you turn the set on.
To be honest, It could be anything in the power supply, Horizontal osc,Output,High voltage, Focus and convergence circuits that caused the problem. OR the dam fly just took a dump.
Put your new flyback in when you get it and start from scratch.
Have a good weekend
Ed