600 watt Sky-Link Power SMPS Repaired
This 600 watt Sky-Link Power SMPS (China made) was brought to me by a fellow-worker with the complaint it could not switch on.
First thing done was to disarm it, a piece of cake, only four screws were holding the upper cover.
As you can see in the photo above there was a lot of cables coming out of the unit, remember it was a 600 watt unit.
I decided to test the voltages of the VSB: +5 volt (purple-colored cable) and the PS_ON: +5 volt too (green-colored cable) as you can see in the photos bellow. This situation has happened several times to me: VSB and PS_ON voltages ok, but the unit refuses to start.
As you can see in the photos above both voltages were ok, but the unit refused to start most of the times. Have a look to the photos below and look how dirty and rusted (I suppose it got wet with some liquid or maybe it was working in a place with a high humidity) was this unit.
After cleaning up the device the first thing done was to check on the e-caps with my ESR Blue Meter and look what was found.
Note: the second photo above was shot before cleaning up the unit.
Four e-caps (3300 µF/6.3 volt x2 and 470 µF/16 volt x2) were found bulged, and of course with a high ESR.
Anyway both of the big filters of the primary side were de-soldered and checked on too.
The four e-caps with high ESR were substituted for similar ones, and the big filters were re-soldered again. When the SMPS was switched on several times, it never refused to start and look the result.
This time the SMPS worked really fine and all the V-out were present.
This article was prepared for you by Humberto Rodriguez, one of our ‘Master Authors’ from Cuba.
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