"Crap"acitors cause the failure of another LCD monitor
Автор: ubuntututorials
Загружено: 2011-04-03
Просмотров: 678
Описание:
Failed caps symptom on an LCD monitor, approximate age 6 years. (Although used for less than a third of that time, as it has been in a garage for a while and otherwise infrequently used.) The display will sometimes not switch on: the power LED will blink or flicker. Or, it will work, but displays a good picture for only a few seconds.
Dirt cheap "xunda" caps have failed. These caps were well specified (470u 25V) for a 5V and 12V power supply. However, they are a cheap brand, which probably means their ESR and ripple current ratings were crap. They would work well for a time, but then these ratings would begin to drift, which is eventually what causes the artefacts on the display.
Tune in to see what happens after these caps are replaced with quality capacitors which won't fail in a short time.
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