Seagate St3500620AS Firmware AD14 Not powering on.

[zaidkagzi47]

Hello,
I have a case where seagate st3500620as not powering on. motor is not spinning. i got reading from pcb. please help me to retrive data. i did not find same hard disk near by my area. so please help me to solve this.

Attachments

[pepe]

is that contamination or sign of smoke on the Smooth chip?

Basically you could use any pcb from same model (ROM transplant neccessary), so i can't see the point in trying to repair this one.

pepe

[Lardman]

Solder on the ROM doesn't look original either. Have you checked it.

[zaidkagzi47]

is that contamination or sign of smoke on the Smooth chip?

Basically you could use any pcb from same model (ROM transplant neccessary), so i can't see the point in trying to repair this one.

pepe

Hello pepe sir
No sign of smoke on the Smooth chip. second thing that i can't find same pcb near by me. i am from india. so i search everywhere but not find same model or same pcb anywhere

[zaidkagzi47]

Solder on the ROM doesn't look original either. Have you checked it.

hello Lardman sir,
Solder on the rom is orignal. I checked it.

[fzabkar]

Seized spindle?

[zaidkagzi47]

Seized spindle?

Hello fzabkar sir,

i think no spindle seized problem. any thing else i can check sir?

[fzabkar]

Measure these voltages:

V1.jpg (89.56 KiB) Viewed 7752 times

Vneg.jpg (118.09 KiB) Viewed 7752 times

[zaidkagzi47]

Measure these voltages:

The attachment V2.jpg is no longer available

The attachment V1.jpg is no longer available

The attachment Vneg.jpg is no longer available

Hello fzabkar sir,

Reading Volts images below.

Attachments

Vneg.jpg (48.51 KiB) Viewed 7680 times

V2.jpg (34.21 KiB) Viewed 7680 times

V1.jpg (39.1 KiB) Viewed 7680 times

[fzabkar]

It appears that the Vcore regulator has a shorted output (0.00V). What is the resistance of the capacitor pair? If it is 0 ohms, then you need to determine which component is responsible for the short. Hopefully the culprit is one of the bypass capacitors around the MCU.

[zaidkagzi47]

It appears that the Vcore regulator has a shorted output (0.00V). What is the resistance of the capacitor pair? If it is 0 ohms, then you need to determine which component is responsible for the short. Hopefully the culprit is one of the bypass capacitors around the MCU.

hello fzabkar sir,
update is heated ic i change with another board and now 2 capecitor reading is 1.11v.

Attachments

V1 (2).jpg (38.74 KiB) Viewed 7652 times

[fzabkar]

If you had a working spare PCB which you were willing to cannibalise, why didn't you just transfer the "ROM"?

[zaidkagzi47]

If you had a working spare PCB which you were willing to cannibalise, why didn't you just transfer the "ROM"?

Hello fzabkar sir,
i haven't this pcb. i search lot of shops near by me but i can't find it. i know that rom transffer is so simple but i didn't find same hdd or same pcb.

[fzabkar]

The Vcore supply is now OK. If the PCB is still not spinning up the drive, then the next step would be to view the output from the terminal pins. You'll need a USB-TTL adaptor, or equivalent.

[zaidkagzi47]

The Vcore supply is now OK. If the PCB is still not spinning up the drive, then the next step would be to view the output from the terminal pins. You'll need a USB-TTL adaptor, or equivalent.

Hello fzabkar sir,
i connect with ttl adaptor but nothing in terminal. terminal is blank.

[fzabkar]

Maybe the MCU is dead?

[zaidkagzi47]

Maybe the MCU is dead?

Thnx fzabkar sir. Yes I thought also. May be mcu currpted. Well thanks for helping me. I return back hdd to customer.