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 Post subject: repair seagate st500dm002
PostPosted: April 15th, 2014, 7:47 
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Joined: April 15th, 2014, 7:40
Posts: 1
Location: Italy
Hi to all guys. Yesterday my hd burnt! After removing it I noted that the board was fired and as you can see some smd components are out. Can someone tell me what type of components are? I would go to a electronic repair office to control the board, but I think I need a scheme. The board is 100535704 REV C
Thank you


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 Post subject: Re: repair seagate st500dm002
PostPosted: April 15th, 2014, 9:21 
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Joined: December 5th, 2011, 5:38
Posts: 1740
Location: Verona, Italy
Sono degli induttori usati come micro-fusibili.
http://it.rs-online.com/web/p/induttori ... /7555235P/
http://it.rs-online.com/web/p/induttori ... /7555239P/

Possono essere sostituiti con un pezzo di filo wire-wrap o una goccia di stagno per far funzionare nuovamente la pcb ma in tal modo verrà a mancare la protezione da eventuali altri problemi elettrici, quindi te lo sconsiglio.
Se dovessero sostituirti gli induttori con dello stagno o con del filo non pensare di continuare ad utilizzare a lungo la pcb in questo stato, fallo solo per il tempo necessario al fine di copiare i dati su un nuovo drive.

Falli sostituire con dei nuovi induttori smd possibilmente, così la pcb sarà nuovamente protetta, senza la protezione rischieresti danni ben peggiori.
Ciao.

P.S.
Non è detto però che si siano bruciati solo quei componenti, in tal caso dovrai prendere in considerazione la sostituzione dell'intera pcb.

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 Post subject: Re: repair seagate st500dm002
PostPosted: April 15th, 2014, 14:04 
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Joined: September 8th, 2009, 18:21
Posts: 16960
Location: Australia
Your drive has experienced an overvoltage on the 5V supply. Check or replace or power source.

The inductors have burnt because the 5V TVS diode is shorted. The diode needs to be removed or replaced before bridging the inductors.

See http://www.users.on.net/~fzabkar/HDD/ST ... points.jpg

... and http://www.users.on.net/~fzabkar/HDD/TVS_diode_FAQ.html

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