Over the years, I've had several 13" and 17" BC chassis sets and most of them had a bad flyback. In my area, we have very hot and humid Summers and I think this is why so many flybacks and triplers failed in sets around here. I recall picking up one 17" BC chassis TV off the street and after replacing a bad power switch, it came to life - for about 15 minutes. I was test running it; and, all of a sudden, the picture got darker, fell out of sync, pulled in on the sides, and BAM - the flyback went up in smoke and stunk up my shop. When it went, it also took the HOT, voltage regulator, and both fuses with it.
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