I looked at CT_schematics.pdf. and get it now.mpattonm wrote:I have meant to say off-spec picoPSU is to blame, specifically slow ramp-up of 3.3 rail
tommo wrote:So maybe something can be put over r22 so it will not so easy change state?
tommo wrote:Hi hencox,
It seems to be that it is 3.3v related, so it must be on the ct60 side.
tommo wrote:Seems like the 10uF on pin 14 (+5vsb) and 12 (-) of the 7474 is indeed not enough to stabelize and maybe 100uF might do the trick.
(I now realize i named pin 14 and 12 pin 1 and 3 previously. This is wrong. The first and third pin for top-left are named 14 and 12)
This sounds very similar to my problems. I have a pico-PSU in my falcon also and when I try to power it on it very often just lights up the powerled for a fraction of a second and then dies down again. I've discovered that if I slightly twist the 12V power cable (coming from the AC/DC-adapter and going into the power lead that finally ends in the ATX-connector in the pico-PSU) then it always suddenly comes alive. I think this suggests that I have insufficient contact in that 12V-connector. Maybe you have the same problem?
1st1 wrote:ATX PSU specification says that Power Good signal has to switch from 0V to 5V not sooner as 100 ms after voltage is stable. To me this sounds as it is a good idea to connect the Power Good signal directly to the reset button or the reset signal. Does it make sense to try that?
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