Seagate ST3500830AS burnt, possible to repair??

[Fuddster]

Hello again!

I got a iomega Ext. Hdd Encl. from a college to find out what the problem is, because it wont even show a life sign, he said!

today i opend the case and plugged the Hdd onto my PC!

After Powering up, the drive killed the PC with a heartbeat!

I smelled something burnt and had a look on the back cause i thought maybe a blow fuse or smth. but couldnt determine anything!

Is it in any way possible to get it back to work again??

THX i.a.


PS. how can i edit a post?? cant find any button for editing??

[pepe]

Hi,
U cannot edit your post after 15 min or so...

regarding the drive:
Probably a PCB problem, can be as simple as removing a TVS, or as problematic as a killed preamp as well.
search TVS on this forum, u will find lotta useful things...

pepe

[networkpc3000]

check this pic for mention which is TVS. http://www.gotbackdata.com/photos/diode.jpg

[Fuddster]

Hello,

thank you for your answers, and tips on the TVS´s!

I made some photos of the PCB, because i cant find any burned or molten diodes nor resistors!

maybe you guys can point me the points out whom are to test ??? like i found on the Backside Pic a place on the upper right, that looks like it got really hot??

THANKS i.a.

Fuddster

Attachments

[swersig]

bottom picture, tvs are on the top left beneath the power connector. check with multimeter if their are shortened. you can also plug in a sata power adapter cable (from normal 4 pin power to sata and measure between ground and 5/12 V if there is a shortage).

[Fuddster]

OK... Thx again for the helpful hints...

I hope i did the right messuring with the Multimeter

So i turned the wheel of the Mm to the Diode sign and pluged the red into V&mA and the black to COM... ( Pic )

The results are shown on the PCB Picture... The left one is 001 (mA???) and the right one shows 510... constantly !

I hope i measured right and again hope you guys can help me once again...

Thanks a lot...

Fuddster

Attachments

M-830.jpg (13.79 KiB) Viewed 11114 times

[Fuddster]

YES!!!!!!!!

Drive is working again.. awesome...

I desoldered the "defective" diode and gave it a shot, like in the other threads... and BINGO..

NOW ....

The Question I´ve got is, do i have to replace the diode with an exact same one? ( defective one ) ontop is written E
BUX
C718

what i know is that it has to be a 12V capable one because, the diode was traced to 12V on sata...

i cant find any data sheet with this description so i wikied TVS and got what i wanted... now that i am from germany i started Eshopping at my electronics shop and found these diodes.. are these the right ones???

http://www.reichelt.de/?;ACTION=3;LA=2;GROUP=A46;GROUPID=3000;ARTICLE=42024;START=0;SORT=preis;OFFSET=100;SID=31MCNbH6wQAR8AAG@-Xv4120d052d87b4f1c6c90769aac13d1839

On the other hand, i have an old IDE Hdd seagate ST310014ACE 8GB with diodes on it! Can i just swap the Diode from the IDEs 12v (ontop is written BUF
C501 ) to my 500GBs missing one???

Im askin cause they have totally different specs on top and i cant find any datasheets or types with the same "specs"!

Once again... THANK U ALL!!!!

sorry for my confusing way to discribe, ask n write...

[fzabkar]

OK... Thx again for the helpful hints...

I hope i did the right messuring with the Multimeter :?

So i turned the wheel of the Mm to the Diode sign and pluged the red into V&mA and the black to COM... ( Pic )

The results are shown on the PCB Picture... The left one is 001 (mA???) and the right one shows 510... constantly !

I hope i measured right and again hope you guys can help me once again... :|

Thanks a lot...

Fuddster

The left one (12V TVS diode) is shorted. This is usually what happens when you plug a 19V laptop adapter into a 12V external HD.

Desolder the faulty diode, or cut it out with side cutters. Just remember you will no longer have any protection on the 12V rail.

[fzabkar]

The component you are referring to is a 12V, 600W, unidirectional TVS diode, marking code BUX, made by ST Microelectronics.

The BU? marking code appears to be used by ST Microelectronics in their SMBJ series 600W Transil (TVS) range. The "C" appears to be the manufacturing location, followed by a numeric YWW date code.

BUF marking code is part number SMBJ13A-TR, working voltage 13V

http://www.datasheetarchive.com/pdf-dat ... 631289.pdf
http://www.st.com/stonline/products/lit ... s/5616.pdf

I believe that "BUX" doesn't appear in the SMBJ datasheet because it probably is a special run for Seagate. You should be able to replace it with an SMBJ12A from Farnell, Mouser, Digikey.

The P6SMB 15A 600W TVS diode you have chosen appears to be a good replacement. It has a working voltage of 12.80V and a breakdown voltage in the range from 14.30V to 15.80V.

http://www.sinus-electronic.de/datenbla ... SMB_de.pdf

[Fuddster]

Heres one HAAAAPY FellA!!!!

THANK U ALL SOOOO MUCH FOR URE EXELLENT HELP ON THIS!!!!!!!!!

I´ll order this right away!

THANK YOU!!!!!

Fuddster!

[rakesh shrestha]

bottom picture, tvs are on the top left beneath the power connector. check with multimeter if their are shortened. you can also plug in a sata power adapter cable (from normal 4 pin power to sata and measure between ground and 5/12 V if there is a shortage).