Quote:
Originally Posted by radiotvnut
Check the four rectifier diodes in the power supply. If those are good, check the regulator transistor in the power supply. If it's shorted, there are probably other components that the transistor took out. Last, check the horizontal output transistor. If the HOT shorts, it can blow up parts in the power supply. If the HOT is shorted, there's a good chance that the flyback transformer is bad. CTC185's had a lot of flyback failures.
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Your comment regarding flyback transformer failures in the CTC185xx chassis got me to thinking. I retired my RCA CTC185A7 and bought a flat-panel about four months ago. The CTC185 was still working like new when I put it into storage, 12 years after I purchased it. No problems whatsoever with the flyback, or anything else for that matter, except the antenna connector on the tuner PC board snapped off, twice, within one year after I bought the TV. But that was absolutely the only problem I ever had with it, unless you count a problem a service technician apparently found with the jungle IC. I never knew there even was a problem with the chip, as the picture on my set was always as sharp and clear as a good photograph. The technician told me that I probably would not notice the problem anyway, since I have cable; the only time I'd probably see it would be if I were using the set with an antenna, which wouldn't work in this area because I am too far from the seven Cleveland TV transmitters (just under 40 miles).
What was it about the CTC185xx series' flybacks that caused them to fail so often -- cheap construction, insulation failures after X number of months or years, breakdowns of parts ahead of the flyback overloading the windings, or just a run of bad flybacks? Were the last RCA CRT sets (CTC203, IIRC) this troublesome as well? I know RCA solved the onboard tuner problem starting with the CTC203 series, but did these sets also have as many if not more flyback problems than even the CTC185xx, et al.?