Quote:
Originally Posted by zenithfan1
I just cringed a little. I do think the CRT developed a H/K short. It flashes blue sometimes with retrace and showed a short when tapping on the neck while testing last week. It wasn't shorted last year when I got it. I guess it's time for an isolation brightener unless I can put it face down and get it to clear by tapping on it. It always had the odd color issue but the short seems to be something new going on, unless it was always there and is now getting noticeable.
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Yikes!
That's a bad omen.
If the jug does have an H-K short, one symptom will be loss of luma. I.e., video information will be gone while chroma is unaffected (since chroma goes in via the grids).
The problem with using an isolation brightener is: added capacitance-to-ground which will smear out fine detail in the pic.
A dirty service switch can mimic a H-K short in the CRT (killing the luma). Give the service switch a squirt of cleaner and work it a few times, just to eliminate that as a possibility.