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 Post subject: ST3250820AS pcb issue
PostPosted: August 1st, 2018, 10:22 
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Joined: January 10th, 2016, 18:26
Posts: 28
Location: romania
Hi,
I received an old ST3250820AS HDD that suffered an unpleasant shock: the owner managed to destroy the crystal. From what I checked on an identical PCB model, the piece is a TXC with the dimensions of 8mm x 4.5mm but I'm not sure if the value is 30.000Hz or 10.000Hz(?!). I would like to know with which model this piece could be replaced because I do not want to do anything stupid.
Thank you.


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2f29de1e-ae9d-4c6f-a2f4-0d6085dc906a_1.2fb11ffc539c106e7b3605c8472f945c.jpeg
2f29de1e-ae9d-4c6f-a2f4-0d6085dc906a_1.2fb11ffc539c106e7b3605c8472f945c.jpeg [ 596.83 KiB | Viewed 358 times ]
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 Post subject: Re: ST3250820AS pcb issue
PostPosted: August 1st, 2018, 15:01 
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Joined: December 19th, 2006, 8:49
Posts: 9510
Location: Portugal
7200.10 . Those drives ar ST-10. NO ADAPTIVE on ROM.

You just need to replace the entire PCB with one from a working drive with the same FW version. You can check FW version on label.

If this is not possible you can replace PCB with another PCB from same model and re-program ROM by TTL. Very simple to do.

I might have PCB to sell you if interested. But should be very easy to find on eBay, etc ...

Just match model + FW. If you have FW tools you can read/write ROM by TTL. You don't even have to move ROM chips. Just get FW resources/ROM for a drive with the same FW version as yours and write the ROM to the new donor PCB.

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 Post subject: Re: ST3250820AS pcb issue
PostPosted: August 1st, 2018, 15:02 
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Joined: December 19th, 2006, 8:49
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Location: Portugal
Can you post a photo of the label of the drive ? I can check my PCBs stock and i can even re-programm a PCB to sell you with correct FW that will work on your drive.

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 Post subject: Re: ST3250820AS pcb issue
PostPosted: August 1st, 2018, 15:34 
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Joined: November 24th, 2013, 18:13
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Location: Poland
You can solder 10Mhz Crystal.

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 Post subject: Re: ST3250820AS pcb issue
PostPosted: August 1st, 2018, 16:10 
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Joined: January 10th, 2016, 18:26
Posts: 28
Location: romania
I searched for this HP oem HDD with the same firmware, the same chip (LSI) and the same memory (Samsung). I found a lot of combinations between Agere/ST/LSI chip and Entrontech/Samsung/Hynix memory that had only 30MHz crystal. I did not know how important the value (more precisely the difference between the two values).

I will replace that crystal as pikus_09 suggested, after I get rid of the "quarantine" period I'm going through now.
Thank you both.


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 Post subject: Re: ST3250820AS pcb issue
PostPosted: August 1st, 2018, 16:25 
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Joined: September 8th, 2009, 18:21
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Location: Australia
Could that be a 40MHz crystal? 10MHz seems much too slow.

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 Post subject: Re: ST3250820AS pcb issue
PostPosted: August 1st, 2018, 16:55 
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Joined: January 10th, 2016, 18:26
Posts: 28
Location: romania
These crystals kill me :)
I found 10MHz crystal on the same pcb, others have 30 MHz, not 40MHz.
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The attachment s-l1600 (3).jpg is no longer available


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 Post subject: Re: ST3250820AS pcb issue
PostPosted: August 1st, 2018, 17:12 
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Joined: September 8th, 2009, 18:21
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ISTM that the "1" is actually a faded "3".

The PCB at the following link has the same MCU numbers as your patient:
https://www.hdd-parts.com/11150676.html

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 Post subject: Re: ST3250820AS pcb issue
PostPosted: August 1st, 2018, 17:29 
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Joined: January 10th, 2016, 18:26
Posts: 28
Location: romania
Ok, thanks for the tips. I will return with the result after they do the replacement, but I still have to wait until I leave the convalescence period.


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