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As in the video that WISCOJIM references, many times electrolytics can show no signs of failure externally (bulging, electrolyte leaking, etc). The best tool for "going around the boards" to quickly check them is an ESR meter which works in-circuit; as most all do. They are so cheap now, that IMHO it show be a mandatory test/measurment device right next to a DVM and the soldering iron.
Tom (PK)
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