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Need help finding inductor(coil) for Samsung HD

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August 4, 2013 8:23:35 AM

My Samsung HD103SJ Spinpoint F3 Hard Drive does not power up, because one of the two 4R7 coils(inductor) was accidentally broken off. The 4R7s look precisely as shown here http://publicphoto.org/technology/samsung-hd103sj-spinp...
Initially only one end of the fine copper coil wire was disconnected and I only had to press on the chip to regain connection and all would be fine. Eventually the whole thing broke off. I have found online sources for and manufacturers of this or similarly labeled thing (4R7 coil) but they don't all have the same specs, as shown here, for example http://octopart.com/vlcf4020t-4r7n1r2-tdk-387066
Their resistance and inductance seems to be the same, but some other 4R7s come in different current(1.24A or higher)
I wish to repair this hard drive myself, but I really do not know how to identify and obtain the correct part. I would appreciate help with this - thanks!

http://forum.hddguru.com/viewtopic.php?t=19723&start=

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a c 272 G Storage
August 4, 2013 12:27:24 PM
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ELL5PS / ELL5RS-A, Panasonic, SMD Choke Coils:
http://industrial.panasonic.com/www-data/pdf/AGM0000/AG...

Use the ELL5PS4R7N
August 10, 2013 4:26:18 AM

fzabkar said:
ELL5PS / ELL5RS-A, Panasonic, SMD Choke Coils:
http://industrial.panasonic.com/www-data/pdf/AGM0000/AG...

Use the ELL5PS4R7N


Thank you much for your response, fzabkar. It is appreciated especially 'cause it is the only one received....I will go ahead and order the part you recommend, and I hope its contact points are as on the original, for ease of attaching. I am still wondering, though, what is the trick for precisely identifying the correct specs of such an item.
Regards!
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a c 272 G Storage
August 10, 2013 12:33:57 PM

That part was suggested by a long standing professional member at the HDD Guru forum.

If I were choosing a coil, aside from the obvious dimensional requirements, I would look for one with a low ESR (Equivalent Series Resistance) and high current rating. The lower the ESR, the lower the power dissipation. An ideal coil would have zero ESR and zero dissipation.

I would also ensure that the part's operating frequency was in the megahertz range. Current HHDs have switchmode DC-DC converters with switching frequencies of 1MHz or more. Look for a coil whose characteristics don't drop off at these frequencies. Panasonic's datasheet doesn't give you this information, so it is a bit of a gamble.
August 11, 2013 5:51:43 AM

fzabkar said:
That part was suggested by a long standing professional member at the HDD Guru forum.

If I were choosing a coil, aside from the obvious dimensional requirements, I would look for one with a low ESR (Equivalent Series Resistance) and high current rating. The lower the ESR, the lower the power dissipation. An ideal coil would have zero ESR and zero dissipation.

I would also ensure that the part's operating frequency was in the megahertz range. Current HHDs have switchmode DC-DC converters with switching frequencies of 1MHz or more. Look for a coil whose characteristics don't drop off at these frequencies. Panasonic's datasheet doesn't give you this information, so it is a bit of a gamble.


Thank you once again for the valuable info. I will research more and,hopefully, find the right coil.
!