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Woke up this morning to the S9 Constantly rebooting. Like OK here we go. If ya removed the load on the power supply, by disconnecting the cable from Pwr supply output, to main board input, the power supply output voltages seemed stable with no load. So it was still fundamentally functional. They are labelled +24V, +12V and +5V at the output ribbon cable connector. If ya monitored any of the output voltages while loaded, none of them were stable. They all followed they same pattern as the rebooting. Closed loop feedback shutting er down under load. Found C19 on the Pwr Supply Board was toast. C19 and C17 are part of a filter network with inductor L5 . C17 measured OK, while C19 Measured only 100 UF on my Triplett DMM. For now I replaced C19 with a 1000 uF 35 V, all I had handy in the parts bin, and for now it's working. Should be OK while I await new caps from Digikey. Anyway, it's all back together scanning the sky again till I get the correct new caps. For future reference here is a list of all the electrolytic caps on the Power Supply Board of the Openbox S9. Openbox S9 Power Supply Constant Reboot Electrolytic Caps These two are in a filter network on the +5V output line if I remember correctly. So if ya ever need to replace one, maybe assume the inevitable and replace em both at the same time. C19 1500 uF 10 V 105 deg C Toast Digikey P14379-ND C17 1500 uF 10 V 105 deg C looks and measures OK Digikey P14379-ND The rest of these just because they are also on other output voltages. C12 470 uF 35V 105 deg C Digikey P12415-ND C13 220 uF 35V 105 deg C Digikey P5552-ND C14 220 uF 25V 105 deg C Digikey P12383-ND C15 100 uF 25V 105 deg C Digikey P5540-ND Not as likely needing to be replaced save for catastrophic failures. C4 33uF 50V 105 deg C Digikey P5567-ND Main AC Rectifier Filter Cap C2 33uF 400V 105 deg C Digikey 565-1464-ND
The original caps all say they are mfr'd by some "Econd" never heard of 'em. Which is a Russian cap mfr. C19 was actually bad (measured 59 uF out of circuit) , C17 it's identical twin measured >2000uF, which is ~ +33%. Possibly how it limped along with a bad cap for so long (2 years or so?)... Box is back up and working.
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