So, I switch to this thread for sharing the latest updates about the issues I was having with the BlueSCSI v2 v2022.12a Wi Fi on my M5120 Portable.
Brief recap: after attempting the pull up resistors mods for preventing the system from crashing upon wake up from sleep, my BlueSCSI unit just stopped working. Eventually, I could identify that the Pico W board was toasted.
Root cause: unknown. In fact, I must amend my previous statement and confirm what remarked by
@Androda, i.e. it's almost impossible to invert the polarity of the power connector. So, the Pico board did not get busted by accidental polarity swap.
Anyhow, switching to a new Pico W did not change the situation: the Pico would not be recognised when connected via Usb. I thought I busted another one. However, as last measure before throwing everything into the bin, remembering the experience of
@JDW I desoldered it and - surprise - it was perfectly OK. So, the issue must have been on the board side. Everything was looking OK, clean and neat. Nonetheless, as last resort before giving up I washed the board with hot water and dish detergent. And - voilà - it just sprung back to life as new.
Must have been some residual flux or whatever under the connectors shorting or messing up the signals.
So, next step has been of course re-doing the "3 resistors" mod. This time everything worked. Except... the Portable still crashes all the times, absolutely no difference compared to previous situation.
Any suggestion on what to test next (likely: hardware-wise) is more than welcome.
Portable M5120, 5 Mb RAM, System 7.1.1. BlueSCSI v2 2022.12a Firmware 2024.04.02, powered by 5V / 12 V derived from Portable inner SCSI interface, according to the scheme available in the "Resources" section of this forum.
Thanks!