replcement HDD Components

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audiofreak19

Oct 13, 2018
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I am trying to find the part number for the two parts in the photo. I think the one on the right is a TVs diode and I think the one on the left is either a fuse or a diode. These are on the 5v circuit right at the connector. I can’t figure out the exact part I need to replace both of these with.

I’m trying to post a picture but can’t figure out how
 
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mortemas

mortemas

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Problem is I doubt there are circuit diagrams available and not all those components are labelled, either directly or silkscreened on the board. There are web sources that sell hdd circuit boards, or you could try to find the same HDD on ebay and see if you can pick it up cheap. Either test/measure the components and buy new ones, remove and transplant them, or swap the whole board (watch out for different hardware/firmware revisions of these boards which might not be swappable with your drive even though the hdd model number is the same).
 
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mortemas

mortemas

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I would post a pic of the board’s part number and the part number of the hard drive and ask if anyone with the same drive can take a pic of theirs to see those components. I’m assuming you’re talking about 2 missing component on that board, right? We need to at least see what they look like as a start. Maybe search for the hard drive/circuit board with google image, but beware the results are not always a perfect match.
 
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audiofreak19

Oct 13, 2018
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O man. I’m sorry. I thought I used the picture where I marked the components I was talking about. I am so sorry. Please take a look at this photo for the components in question. The one on the left has a marking that says XH and does not have a cathode band so I don’t think it’s a diode. The one on the right is the one I think is the TVS diode. It looks like it says LV in it. http://
 
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mortemas

mortemas

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Tough to say for sure. Yeah, the one on the right could be a tvs, but also a rectifier diode or a schottky. You’ll need to examine its place in the circuit. If it is in series only, and it is forward biased, it is probably a rectifier. If the anode (the end without the line) is connected to ground, and it is reverse biased, then it is likely a tvs, although there are also bi-directional TVSs available.

Not even sure about the other one. According to www.marsport.org.uk/smd/mainframe.htm it could be a zener diode, but then you’d need to know the value. I’m guessing you really need the data on that drive. Did you consider a data recovery service? If you’re going to diy, I think the best bet is to buy another of the exact same drive and, if you have the proper equipment, transfer the two components from the donor to the existing board. I looked into it a bit more and you can’t really swap the entire controller board because the head calibration data is in there and each drive is factory calibrated. Good luck.
 
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audiofreak19

Oct 13, 2018
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Thanks yea I actually had another of the exact same HDD’s that I was able to remove the component on the left and replace it on the HDD in the photo. Both HDD’s had the component on the left be bad. I was able to obtain the data but would like to find these components to be able to put it back together.

I do know that the size of the diode with the band is linked to the 5v positive and the bottom is connected to ground. Basically in parallel.

The smaller component is in series with the 5v circuit.
 
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EP000001

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Did you see the link I left for you?

SMD nomenclature states that A1 component identifier is a transistor. What type of transistor it may be is a different story...

 
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EP000001

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I would state that it does have a 3rd lead running underneath. If the circuit board is removed and free standing, it might be possible to see a third circuit board track.

Have you tried contacting the company who manufacturd the circuit board and talking to their techs? they might be able to help.

 
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mortemas

mortemas

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No, I again have to disagree. That is not authoritative, it is just search results from a database someone set up online. Show me a source that defines standardized markings for SMDs. So, which one of those in your link is the transistor with a third lead underneath? Is it the one made by Phillips? That one is an RF amplifier that has 4 gull-wing leads coming out of the sides (2 of which are ground). Nothing like the chip that is in the photo. How about the second listing, made by Rohm? That chip has 5 leads and 2 transistors within. Again, not a match. Third? Nope, another dual transistor chip with 5 leads. Again, my friend, it's not as simple as looking up the markings in a google search. Read the very first page in this document: https://www.sos.sk/pdf/SMD_Catalog.pdf
 
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EP000001

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May 10, 2016
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You're correct, sorry, looks like A1 is a diode not a transistor.

Have you looked through this SMD code book? It has 75,800 codes, it may help.

https://www.google.com.au/url?sa=t&rct=j&q=&esrc=s&source=web&cd=8&cad=rja&uact=8&ved=2ahUKEwjl_fry5IzeAhUaAXIKHRMdD3oQFjAHegQICRAC&url=http%3A%2F%2Fwww.sphere.bc.ca%2Fdownload%2Fsmd-codebook.pdf&usg=AOvVaw0QKsFHK_1puODjFTPjWpIJ
 
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EP000001

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Don't forget that transistors can also be used as diodes.

Also if it is not as simple as matching the lettering, and we don't have part numbers, then we are pretty much lost...

 
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audiofreak19

Oct 13, 2018
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I apologize i did not see the posts above my previous post. When I removed the diode looking component there was no other trace connection underneath it. It was just the two pads.
 
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