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 Post subject: Seagate St3500620AS Firmware AD14 Not powering on.
PostPosted: August 14th, 2022, 5:49 
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Joined: April 8th, 2016, 6:10
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Location: SURAT, GUJARAT, INDIA.
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.


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 Post subject: Re: Seagate St3500620AS Firmware AD14 Not powering on.
PostPosted: August 14th, 2022, 6:13 
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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

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 Post subject: Re: Seagate St3500620AS Firmware AD14 Not powering on.
PostPosted: August 14th, 2022, 6:16 
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Solder on the ROM doesn't look original either. Have you checked it.

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 Post subject: Re: Seagate St3500620AS Firmware AD14 Not powering on.
PostPosted: August 14th, 2022, 6:24 
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Joined: April 8th, 2016, 6:10
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Location: SURAT, GUJARAT, INDIA.
pepe wrote:
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


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 Post subject: Re: Seagate St3500620AS Firmware AD14 Not powering on.
PostPosted: August 14th, 2022, 6:27 
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Joined: April 8th, 2016, 6:10
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Location: SURAT, GUJARAT, INDIA.
Lardman wrote:
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.


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 Post subject: Re: Seagate St3500620AS Firmware AD14 Not powering on.
PostPosted: August 14th, 2022, 13:39 
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Joined: September 8th, 2009, 18:21
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Location: Australia
Seized spindle?

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 Post subject: Re: Seagate St3500620AS Firmware AD14 Not powering on.
PostPosted: August 15th, 2022, 7:23 
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fzabkar wrote:
Seized spindle?

Hello fzabkar sir,

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


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 Post subject: Re: Seagate St3500620AS Firmware AD14 Not powering on.
PostPosted: August 15th, 2022, 13:09 
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Measure these voltages:

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V2.jpg
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Attachment:
Vneg.jpg
Vneg.jpg [ 118.09 KiB | Viewed 2602 times ]

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 Post subject: Re: Seagate St3500620AS Firmware AD14 Not powering on.
PostPosted: August 16th, 2022, 3:27 
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fzabkar wrote:
Measure these voltages:

Attachment:
The attachment V2.jpg is no longer available
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The attachment V1.jpg is no longer available
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The attachment Vneg.jpg is no longer available

Hello fzabkar sir,

Reading Volts images below.


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V1.jpg
V1.jpg [ 39.1 KiB | Viewed 2530 times ]
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 Post subject: Re: Seagate St3500620AS Firmware AD14 Not powering on.
PostPosted: August 16th, 2022, 4:39 
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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.

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 Post subject: Re: Seagate St3500620AS Firmware AD14 Not powering on.
PostPosted: August 16th, 2022, 4:58 
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fzabkar wrote:
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.


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 Post subject: Re: Seagate St3500620AS Firmware AD14 Not powering on.
PostPosted: August 16th, 2022, 12:34 
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If you had a working spare PCB which you were willing to cannibalise, why didn't you just transfer the "ROM"?

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 Post subject: Re: Seagate St3500620AS Firmware AD14 Not powering on.
PostPosted: August 16th, 2022, 13:57 
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fzabkar wrote:
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.


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 Post subject: Re: Seagate St3500620AS Firmware AD14 Not powering on.
PostPosted: August 16th, 2022, 14:14 
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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.

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 Post subject: Re: Seagate St3500620AS Firmware AD14 Not powering on.
PostPosted: August 17th, 2022, 1:56 
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fzabkar wrote:
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.


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 Post subject: Re: Seagate St3500620AS Firmware AD14 Not powering on.
PostPosted: August 17th, 2022, 13:39 
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Maybe the MCU is dead?

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 Post subject: Re: Seagate St3500620AS Firmware AD14 Not powering on.
PostPosted: August 20th, 2022, 13:18 
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fzabkar wrote:
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.


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