Great work, how did you get pin 8 (24 Pin: PwrOk/ Power Ok) from the PSU to the 24pin for the Mainboard?Next update: Modding the Pico!
With the proof-of-concept delivered, it's time to mod the Pico PSU to get rid of the spaghetti on the left hand side and turn it into something a little more SFF-ish.
For this to work, I need to replicate my modifications to the ATX extension cable on the pico board - cutting the +5V Standby pin of the ATX plug off from the board and feed it from the PSU directly, and linking the Pico's PS_ON signal pin to the corresponding one on the PSU:
The tricky bit will be cutting off the solder pad of Pin 9 to realibly isolate it from the board. Unsoldering did not really work as the pin physically overlays the pad, even with the solder removed.
Instead, I'll have to resort to slighly heavier tools: A Dremel with a small diamond cutting disc, hoping that I can cut one pin off without damaging anything else...
...and at first sight the result looks ok - a clearly visible "trench" separating pin and pad, cut slightly into the pcb to ensure no contact remains.
Initial measurement looks good...
...and when hooking it up to the PSU tester, I get the desired result: no reading on the +5VSB input, meaning the Pico is successfully disconnected from standby output:
Now I carefully solder the bypass cable into the pin, trying to avoid any contact with the original pad...
...and test the result for proper isolation before connecting the bypass to power - looking good!
Connecting the bypass cable to the PSU, the +5VSB output comes on - seems to work:
Next and less complicated step is soldering a wire onto the pad for pin 16, providing the PS_ON link.
...and plugging the Pico into the PSU tester, the PSU immediately comes to life - seems to do the trick!
WIth some preliminary shrinkwrap makeup applied, the plugin board starts to look reasonably tidy...
...and all that remains to be done is to give it a real world test drive!
This is also a nice opportunity to compare the modded pico with the HDPLEX direct plug: Significantly smaller - but clearly inferior in terms of blackness (black picos, anyone?), and somehow missing that weapon-grade feel of the heavy heat sink...
...anyway, I have a feeling that I'll get to appreciate any tiny amount of volume saved!
All fires up!
Up next: Raising the stakes and throwing some other interesting parts into the mix to avoid this turning into a PSU-modding-only-thread - aim still remains to build a machine!