rmcelwee
Member
Strange things going on with switching power supply
I have an old switcher that is acting up. I have no history with the thing but fired up an old game and it worked. My wife walked out to the shop and I wanted to show her the game and it would not turn on. For some reason the switcher had no output (at least not the +5). I could not see any problems so I disconnected the jamma harness from my pcb and fired up the machine again. The switcher started working. Later on I pulled the pcb out of the machine to do some work to it and again when I put it back in the switcher would not fire up until I turned it off and disconnected the jamma. Is this coincidence or am I missing something. Could a load on a switching power supply make it not work at all (maybe just a blip and then that is it) or it just blind luck seeing what I saw? Is there something in a switcher that would be going bad and give this symptom?
Thanks!
I have an old switcher that is acting up. I have no history with the thing but fired up an old game and it worked. My wife walked out to the shop and I wanted to show her the game and it would not turn on. For some reason the switcher had no output (at least not the +5). I could not see any problems so I disconnected the jamma harness from my pcb and fired up the machine again. The switcher started working. Later on I pulled the pcb out of the machine to do some work to it and again when I put it back in the switcher would not fire up until I turned it off and disconnected the jamma. Is this coincidence or am I missing something. Could a load on a switching power supply make it not work at all (maybe just a blip and then that is it) or it just blind luck seeing what I saw? Is there something in a switcher that would be going bad and give this symptom?
Thanks!

