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I tell you one thing: it's way too damn dusty in there. Blow a bunch of compressed air on everything. Dust can technically conduct electricity, depending on conditions.
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Once I dust out the inside with compressed air, is there anything else I can do for preventative maintenance? I've heard it's a good idea not to use sets when it's hot or humid because that can lead to cracked solder joints.
My old Panasonic works perfectly (and flicker-free for what it's worth) since '94, but did develop a bad joint in the vertical section about 10 years ago that had to be repaired as well as a sticking power relay. I never dusted it out until the problem had surfaced.
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It's definitely 60Hz hum related. It could be a bad filter cap in the power supply primary, or an external cause like a ground loop. Even things like light dimmers can cause this type of problem.
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That was exactly it. I have isolated the flicker to the charger for my MacBook computer. When the charger isn't connected, the flicker disappears.