arkadi58 wrote: > I got a comparable PS from a local source; the size is different, so the > result is not that pretty, but an immediate success. > 22124 > Here is a picture of the old PS; there are some signs of heat damage, > right opposite the voltage regulator. > 22125
Glad it was the fix. The symptoms were classic. Point of interest is that in switchmode power supplies like this, there is usually no single voltage regulator. Most of the active parts are inside a feedback loop that couples back to the power line side with an opto-isolator. The slippery slope to failure usually starts with a slowly partially failing electrolytic cap or transistor. its internal resistance increases a little at a time. The power supply may still measure OK with no load, but in use, some voltage output is well below spec. For example, the spec for 5 volts is on the order of 4.75 volts minimum. So the 3-ish volts that was observed was solidly in failure territory. Given the low costs and possibility of multiple degraded components, a total replace makes a ton of sense. ------------------------------------------------------------------------ arnyk's Profile: http://forums.slimdevices.com/member.php?userid=64365 View this thread: http://forums.slimdevices.com/showthread.php?t=105822 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/audiophiles
