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Diagnosing capacitors- no leak or bulge?
Can a capacitor go bad even though there are not visible external signs of failure such as bulges or leaks? I am inspecting an inverter board for an older Apple Cinema display that has an intermittent backlight failure. The common diagnosis is failed capacitors on the inverter board, but mine appear ok.
2 Answers
- spacemissingLv 74 years agoFavorite Answer
Most capacitors that go bad don't show any outward signs of it.
Testing them for leakage with an ESR meter
is the best way to be sure whether they are good or not.
- ?Lv 64 years ago
They usually bulge, but in some cases they fail without looking bulged. To prove it is good or bad you need a capacitor tester, and it has to be removed from the board to test it.
