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yes it can be as simple as a cap, dumb cheapo caps these days.
I just had a DTV converter box go south on me (apex I think) the green led would flicker, it would come on after repeated attempts, eventually no more.
I pulled it apart, found a 330 uf 16v cap with a dome shaped top, pulled it, yep bad, replaced with a 470uf (all I had) 35v rat shack and it worked fine.
the 330uf was TINY like about 1/4 wide by 3/8 tall. This is why I am hesitant to replace old E caps in a lot of stuff made in the 1960's and later. They ofter test fine (value and leakage at rated value) and even though they are old I sometimes wonder if modern caps are a good idea if the old ones out ok.
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