Reply 20 of 42, by momaka
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boby wrote on 2024-04-08, 17:42:My current adapter is also straight-through.
Ah, OK, that's probably why it's not working then.
I though this whole time your adapter was a special one for converting these proprietary PSUs.
boby wrote on 2024-04-08, 17:42:So I guess, this Pin 11 is the problem, because it is not connected
According to one of your posts above,
"11: Rose 3VAUX"
3VAUX (3.3VSB) has no place on a standard ATX pinout. Only the 5VAUX (5VSB) does. So it's fine that pin 11 is not connected. Do NOT connect it to anything.
Again, if the pinout you posted several posts ago above is correct, then this is how it should be wired:
PIN # ON COMPAQ PSU ---------> PIN # on -standard- ATX connector
1: Brown 3V -------------------> pin #1
2: Brown 3V ------------------> pin #2
3: Black GND -----------------> pin #3
4: Red 5V --------------------> pin #4
5: Black GND -----------------> pin #5
6: Red 5V --------------------> pin #6
7: Gray ? ---------------------> pin #8 (??) (equivalent to PWR_OK??)
8: Thin Purple FAN_ON --------> leave disconnected for now
9: Green 5V AUX --------------> pin #9
10: Orange +12V --------------> pin #10
11: Rose 3VAUX ----------------> do NOT use / leave disconnected
12: Thin Red-White FAN-CMD ---> leave disconnected for now
13: Brown 3V ------------------> pin #11
14: Blue: -12V -----------------> pin #12
15: Black GND -----------------> pin #13
16: Thin White ON-STBY --------> pin #14 (equivalent to PS_ON??)
17: Black GND -----------------> pin #15
18: Black GND -----------------> pin #16
19: Black GND -----------------> pin #17
20: Thin Yellow ? ---------------> leave disconnected (this pin is reserved the -5V rail)
21: Red 5V ---------------------> pin #19
22: Red 5V ---------------------> pin #20
23: Thin Brown 3VRS -------------> bridge with either pin #1, 2, or 3 (3.3V rail sense pin??)
24: Thin Blue-White FAN_SINK ----> leave disconnected for now
With this, note that we didn't use pins 8, 11, 12, 20, and 24 from the Compaq PSU.
#11 we don't use.
#8, 12, and 24 might be signal pins for the Compaq PSU's fan, so not sure what to connect to at the moment, but they might need to be connected to something.
That leaves only #20, which I'm not sure what it is used for. You'll need to trace where it goes inside the PSU. Might be another signal or voltage sense pin... which again, may be needed for the PSU to sustain PS_ON.