mad_ady wrote: ↑Sat Jun 08, 2019 2:12 pm
@Panoptis: could you make a more detailed description of what went wrong, where tghe transistor is located, how you identified it was broken and how you bypassed it? I expect more people will run into this issue sooner or later...
Sure.
Snatched a spdif audio LED from an old Mainboard and got it working with the N2.
Sound was gone and I fond it was due to a loose contact at the wire coming from the spdif socket (probably bent it too often when fixing the socket to the N2 case with a little hot glue).
That's when I should have switched the N2 off and repaired the connection but I instead jiggled it a bit to get sound back until the end of the movie
... vcc wire came of completely and touched GND, puff of smoke from wire and N2. No more power on 3.3 V lane.
Turned it off and examined the Board with
schematic open (memorized what side of the N2 the smoke came from) and saw the damage on the mosfet (see my first post) that was also clearly important for the 3.3v lane as I could decern from the schematic.
EDIT: as to where it is located, you can see the sys and pwr LEDs in the Image.
Then I followed @joergs post, used a cheap soldering kit I already had and carefully removed the FTK3407 with tweezers and soldering iron, one connection after the other.
Used a tiny amount of solder to bridge source and drain and since it seems everything else seems fine, ordered the TSM650P03CX joerg recommended.
Will report when it arrived and I soldered it (will be a few days).
Still don't know what the Q1/Q2 mosfets and the circuit (second image in Imgur gallery in my first post) does exactly... I guess voltage stabilization?