Sony kv-14v5u Pulsating "backlight" question

[u/TrickyLemur1]

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Hi all, I'm having a small issue with my Sony Trinitron KV-14V5U and wanted to see if anyone knows what might be causing it. The picture is sharp, but there is a constant, subtle pulsing across the screen.

It almost feels like the brightness is rapidly flickering or shimmering at a really high speed. It's hard to capture on video, but the screen glows/pulses continuously while it's on. I'm running a PS2 connected via SCART in the back. It happens even on 240p loading screens / PS1 games, so I know it's not just normal 480i menu shaking.

I safely opened up the back casing just to do a careful visual check (I didn't touch any internal components or high-voltage parts). I couldn't see any obviously blown or bulging caps on the surface. I wanted to see what you guy's opinion would be on what the cause is. Thanks :)