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tom58
 Post subject: Where is the diode?
PostPosted: June 8th, 2010, 13:26 
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Joined: May 17th, 2010, 10:39
Posts: 3
Location: Canada
Fried the drive......again.

Last time I just popped off the TVS diode and life was good for data recovery.

Anyone know where it is on this one?


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poehere
 Post subject: Re: Where is the diode?
PostPosted: June 8th, 2010, 13:28 
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Joined: February 27th, 2009, 3:26
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Location: French Polynesia Tahiti
The two right under you power connector. Test them

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therealjoeblow
 Post subject: Re: Where is the diode?
PostPosted: June 8th, 2010, 15:46 
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Joined: June 7th, 2010, 12:49
Posts: 5
Location: Canada
Can you please clarify "test them".

I have a Fluke Digital Multimeter (auto range); should I just set it to resistance mode and check for a dead short? Or use the continuity checker that beeps of shorted?

Thanks
The REAL Joe
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thatdellguy
 Post subject: Re: Where is the diode?
PostPosted: June 8th, 2010, 17:14 
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Joined: August 19th, 2007, 17:30
Posts: 1898
Location: In your hard drive.
http://lmgtfy.com/?q=how+do+i+test+diodes

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therealjoeblow
 Post subject: Re: Where is the diode?
PostPosted: June 8th, 2010, 18:11 
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Joined: June 7th, 2010, 12:49
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Location: Canada
Thanks for the cryptic answer. You couldn't just post a couple of simple instructions specific to testing the diodes on-board on a Harddrive here?

/TRJB
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code_slave
 Post subject: Re: Where is the diode?
PostPosted: June 8th, 2010, 18:39 
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Joined: August 5th, 2008, 7:00
Posts: 111
Location: Hong Kong
Before you guys go "randomly" probing about for "diodes" be aware that some cheap multi testers use a 9v battery.

so if you have your multi-tester set to "sounder", there is a possibility you can damage some of the Cmos inputs for some chips if you reverse bias the substrate of the device.

In English :
You can seriously shorten the life of some chips , by using the wrong analysis protocols
and please ALWAYS remember you anti-static wrist strap with integral resistor and grounding wire.
(notice that all these "pro" disk repair kits do not come with a cheap reusable $3.00 antistatic wrist band)

Remember safe repair is like safe sex: always wear the correct protection. :wink:

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thatdellguy
 Post subject: Re: Where is the diode?
PostPosted: June 8th, 2010, 18:41 
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Joined: August 19th, 2007, 17:30
Posts: 1898
Location: In your hard drive.
No, you wouldn't learn anything by me telling you how to test a simple diode.

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fzabkar
 Post subject: Re: Where is the diode?
PostPosted: June 9th, 2010, 9:32 
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Joined: September 8th, 2009, 18:21
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Location: Australia
code_slave wrote:
Before you guys go "randomly" probing about for "diodes" be aware that some cheap multi testers use a 9v battery.

so if you have your multi-tester set to "sounder", there is a possibility you can damage some of the Cmos inputs for some chips if you reverse bias the substrate of the device.


What is the open circuit voltage and short circuit current of a cheap multimeter?
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fzabkar
 Post subject: Re: Where is the diode?
PostPosted: June 9th, 2010, 9:48 
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Joined: September 8th, 2009, 18:21
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Location: Australia
therealjoeblow wrote:
Thanks for the cryptic answer. You couldn't just post a couple of simple instructions specific to testing the diodes on-board on a Harddrive here?

/TRJB

viewtopic.php?f=1&t=14361#p105568
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scratchy
 Post subject: Re: Where is the diode?
PostPosted: June 9th, 2010, 10:10 
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Joined: August 9th, 2007, 8:40
Posts: 791
Location: United Kingdom
You don't check a diode with Ohm Meter, check it with a Diode tester option.

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