Hi kaliyan! the chips I ordered have arrived and I already installed the replacement BQE IC for U7. Now I have a clean 1.0V and 2.91V on the inductors L4 and L5 but sadly the SSD is still not being detected by BIOS/EFI on laptops or desktop PC. The controller seems to have a power because it heats up.
I'm still blind due to non-availability of schematic and I'm hoping to find some lights by identifying some other IC's on the PCB and continue from there.
I'm suspecting that the controller SandForce SF-2281VB1-SDC does have one of the following issue:
a) is not getting all the voltages it needs or required logic signal to switch it ON
b) needs re-balling
c) it could be toasted or has a corrupted firmware
I will post some photos again later..
Posted after 1 hour 5 minutes 11 seconds:Here are the photos I took,
left pins of C32, R27, R24, and C41 are GROUND.
as illustrated, pin 4 of this IC (U6) goes to C41 and pin 5 goes to R27 - near the controller on the photo above
I wonder what IC's are U6 "14BBJ" and U1 "W5BE 006"