Help identifying components Seagate Ironwolf 4TB ST4000VN008

[mustava]

Hi All,

I have recently had a PSU die in my server, taking 6 brand new Seagate Iron wolf 4TB drives with it.
All the drives are/were in good mechanical condition.

I have been doing some research on the most appropriate route to revive these drives. Most of what I have found either points to replacing the 5v or 12v TVS Diodes or transplanting the 8-pin BIOS chip onto a new PCB.

Given my options, I figure re-soldering two pins (TVS) instead of 8(bios) is the easiest way - and if that doesn't work, then transplanting the BIOS onto a new PCB.

I am looking at using the following across the 5/12v diodes that read as shorted on the multi-meter.
5v
12v

In the drives I have tested thus far, the components in red test as 0/short on the mm.
The component in Blue seems to test OK, only providing a reading in 1 direction of 700ohms.

Have I correctly identified the bad diode? is there anyway i can find if its the 5v or 12v diode? Ive been unable to find any examples of my exact PCB (100788341-rev-c) but on other seagate boards it appears to be the 5v.
Also, the markings on the two chips
Red/top: AE-03E-M (I believe this is the 5v diode which is reading as short)
Blue-right: 68E-OC607 (I believe this is the 12v diode which is reading as 700ohms)

Attachments

[mustava]

Hi all,

Just in-case this is helpful to anyone fzabakr has provided some great advice over at the following thread:
https://forums.tomshardware.com/threads ... 8.3756727/