Sylvia Else wrote:
Bob Larter wrote:
Sylvia Else wrote:
Bob Larter wrote:
TonyS wrote:
Bob Larter wrote:
Sylvia Else wrote:

Accumulated dust &/or smoke on the EHT circuitry & the back of the
CRT. Take the back off the TV & see if you can see any arcing.


I would. It most likely needs nothing more than cleaning out all
the gunk.


It's been a long time since I fixed my CRT TVs. But, wasn't it that
the picture expanded when the HV briefly collapsed when arcing? I
can't see this happening in the video.

I would expect the image to shrink horizontally &/or lose brightness
during arcing.


I think there is an, albeit slight, reduction in width. Whether the
brightness drops is hard to say because the colour disappears.

What I find striking is that some scan lines appear to start early,
by an amount of time that is quite consistent.

It's not clear to me whether the noise is coming out of the
loudspeakers, or directly from the interior of the TV.

Try muting the sound then listen for the noises. If it's audible at
all, arcing tends to make a hissing or crackling noise.


Does muting kill the power to the audio output amplifier, or just its
audio input?

Dunno, but most probably the latter.

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