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slongo · Active contributor Joined: 23 Dec 2009 Posts: 8

Im having the problem where i put the wrong adapter in the drive and now when put into any casing or pc, it does not allow for said enclosure to power up, in turn not allowing me to attempt to pull data from it. I am going to attempt the logic board switch as suggested by others with simmilar stories

Specs on label (i dont know what everything means but im posting for identification):

samsung model HD502IJ (500 gb/7200rpm/16M)
hdd p/n: HD502IJ
LBA 976,773,168 500.0GB F1_3D
s/n: S13TJ90Q776502
P/N: 478221KQ727899
number underneath barcode on PCB itself: PETRC6V5N51037

other markings i can see with text in korean before them-
SEC-HD502IJ(B)
2008.07

thanks a lot in advance and I hope someone out there can help!

harddrivespecialist · Posted: Thu Jan 07, 2010 3:22 pm Post subject:

Check TVS chips on your drive.
There is 2 of them near power connection.
One of them probably shorted, you have to remove it and your drive should work. But remember!!! drive will have no protection at that point. Any power spike could kill your drive and recovery will be very expensive.
So its better to replace TVS right away.
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slongo · Active contributor Joined: 23 Dec 2009 Posts: 8

i tried checking the voltages of what i think are the tvs chips youre talking about. from what i had read, i should have gotten a voltage reading from one and not from the other, and to remove the one i wasnt getting a reading from.

unless i was doing something wrong, i wasnt getting a voltage reading from either of them. Any advice regarding this?

harddrivespecialist · Posted: Thu Jan 07, 2010 4:43 pm Post subject:

you have to measure resistance, not voltage.
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slongo · Active contributor Joined: 23 Dec 2009 Posts: 8

i was using a multimeter to get the readings. is that still incorrect? also, are the chances pretty good that as long as i fix that that the hard drive will work? additionally, can i just take em both off and at least get the hard drive to work, or does it need at least one to work? neither of them look physically damaged.

thanks in advance for your help and timely replies!

slongo · Active contributor Joined: 23 Dec 2009 Posts: 8

so im pretty sure what i meant to say was that i was testing the resistance. i had the multimeter prongs at opposing ends of what i think are the diodes you are talking about and have been mentioned in earlier posts. like i said, i got no reading from either one

harddrivespecialist · Posted: Thu Jan 07, 2010 6:48 pm Post subject:

Connect your drive directly to a computer power supply and if your computer won't even power on, that means one of TVS did its job.
If your computer will power on, then you most likely burned motor controller chip on a board.
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sunnydreamspace · Deadharddrive regular +5 Joined: 04 Jan 2009 Posts: 540

please contct me by email if still need this PCB.
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skype: sunnydreamspace

slongo · Active contributor Joined: 23 Dec 2009 Posts: 8

harddrivespecialist-

i have put it into a computer and the computer wont turn on. since this is the case and the tvs "did its job" what would be the logical next step?

harddrivespecialist · Posted: Fri Jan 08, 2010 9:42 pm Post subject:

you have to remove it and your drive should work. But remember!!! drive will have no protection at that point. Any power spike could kill your drive and recovery will be very expensive.
So its better to replace TVS right away.
_________________
www.datarecoveryne.com

slongo · Active contributor Joined: 23 Dec 2009 Posts: 8

Hdspecialist-

i mentioned before that im getting no reading from either diode. Is it possible to remove both of them and still have the hard drive work?

harddrivespecialist · Posted: Sat Jan 09, 2010 12:52 am Post subject:

Yes, you can try it.
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slongo · Active contributor Joined: 23 Dec 2009 Posts: 8

i guess what im asking moreso is if it is "safe" or "ok" to remove the diodes, as in, doing so doesnt run a likely risk of screwing things up more or damaging other aspects of the hard drive.

If im understanding correctly, they essentially act as a sort of surge protector, and once blown put the hard drive in a frozen state as to not allow further damage, correct? Their function doesnt have any greater effect on the operation of the hard drive?

thanks for the patience. I just want to make sure I do this right if im going to do it myself

harddrivespecialist · Posted: Sat Jan 09, 2010 5:26 pm Post subject:

Its ok, but not safe.
75% chance everything is going to be fine and 25% it might damage something else, such as your power supply, mother board and etc., if there is another shorted part on a board.
Power spike could also damage preamp chip on reading heads, if this happens, it will cost you a little fortune to recover your data.
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slongo · Active contributor Joined: 23 Dec 2009 Posts: 8

When youre talking about power spike damage, youre talking about after ive gone through the process of removing them and getting the hard drive working, correct?

What i am considering is taking off the diodes, getting it powered on and removing the data immediately (assuming this kicks it back to life anyway). Do you think this is a relative safe operation, regardless if it works or not?

Also, would taking off the logic board after ive removed the diodes and just attaching the logic board itself to a computer or enclosure be a safe way of testing it out since no data is actually on the logic board itself (correct me if im wrong here)? I figure this could be a good preliminary test before powering on the hard drive with the diode-less pcb.

Thanks in advance