All times are UTC - 5 hours [ DST ]




Post new topic Reply to topic  [ 5 posts ] 
Author Message
 Post subject: Toshiba Hard Drive not working after Power Supply swap
PostPosted: February 6th, 2019, 4:06 
Offline

Joined: February 5th, 2019, 19:07
Posts: 2
Hi everyone.

Earlier this week I swapped out my power supply and accidentally used the SATA power cable from the old unit. The PC didn’t turn on until I realized this and replaced it with the correct cable.

Later, I found out that one of my hard drives wasn’t working. It stays cold, does not spin up, does not get detected in BIOS, and different cables/ports did not help. I also tried it in an external USB enclosure which didn’t work either.

After doing some reading around, my understanding is that the PCB’s most likely been damaged by overvoltage. I found a post from here of someone in almost exactly the same situation: https://forum.hddguru.com/viewtopic.php?f=1&t=36343

They even more-or-less have the same drive. Theirs is a 6TB Toshiba X300 6TB, mine’s a X300 5TB. Like them, I also have a spare drive of the same model. I tried its PCB on the ‘dead’ drive and it spun up which leads me to believe that the damage is limited to the PCB only. The drive was not recognized though, which I’m assuming to be due to the firmware/bios/controller chips that would need to be transferred.

However, I’m nowhere near an expert so don’t know for sure. From looking at their pics the PCBs are different (notably the lack of IC17). I bought my drives in January last year, around the time that post was made, so maybe the PCB design is newer and has better overvoltage protection? Here’s hoping.

I’ve uploaded an imgur album containing pictures of the board here: https://imgur.com/a/QFSW9CS Let me know if you would like others.

I’ve also compiled a list of the ICs I could find on the board, along with (what I gathered to the best of my ability) their functions: https://docs.google.com/spreadsheets/d/ ... sp=sharing

Would I be correct in thinking that ICs 1, (possibly) 2, 9, 10 (according to one review site this one houses the firmware), 11 and 12 should be transferred over to a donor board in order for it to work? Or should all of the ICs be transferred, just for safe measure? (Of course I wouldn’t attempt that myself and instead take it to a professional electronics repair store)

I’ve also read that there might be some kind of fuse component that might have tripped and replacing/bypassing that could get the PCB working again. Is there anything on the board that looks like that?

I have a small multimeter that I can use to take measurements but would require guidance as I don’t have much experience (read: next to none) dealing with this kind of thing. Here’s a picture of the multimeter and it’s available modes: https://imgur.com/S6xgmuJ . If you would like me to take a measurement on either the working or faulty board please let me know, including where to place the probes and which mode to use.

I would greatly appreciate any help and advice you have to offer.
Thanks for your time.


Top
 Profile  
 
 Post subject: Re: Toshiba Hard Drive not working after Power Supply swap
PostPosted: February 6th, 2019, 4:43 
Offline
User avatar

Joined: July 12th, 2010, 4:38
Posts: 1156
Location: Portugal
Maybe start by checking the diodes near the power connector.

_________________
http://www.pclab.com.pt facebook.com/PCLAB.Assistencia.Tecnica
ACELab partner


Top
 Profile  
 
 Post subject: Re: Toshiba Hard Drive not working after Power Supply swap
PostPosted: February 6th, 2019, 4:47 
Offline
User avatar

Joined: September 8th, 2009, 18:21
Posts: 11610
Location: Australia
ISTR a thread where it was claimed that all 4 serial flash memories (IC9 - 12) need to be transferred. BTW, you should back up the contents of these chips if you can find someone competent (eg hdd-parts.com) to do this for you.

As for testing the PCB, that other HDD Guru thread (https://forum.hddguru.com/viewtopic.php ... 21#p255121) confirms that your PCB has no overvoltage protection (the diodes provide reverse polarity protection), so there will most likely be damage to the ICs rather than the diodes. Hopefully the serial flash ICs have survived.

Good luck.

_________________
A backup a day keeps DR away.


Top
 Profile  
 
 Post subject: Re: Toshiba Hard Drive not working after Power Supply swap
PostPosted: February 6th, 2019, 7:20 
Offline

Joined: February 5th, 2019, 19:07
Posts: 2
Thanks so much for your replies! :D
First off, let me just say that I'm completely inexperienced when it comes to this sort of thing so I apologize in advance for any frustration I cause you due to that.

pclab wrote:
Maybe start by checking the diodes near the power connector.

Image

I wasn't sure whether to measure the diodes directly or using the contact points shown in red so I did both. Here's what I got using the diode test mode:
D703 diode on faulty board: 0.719v
D703 diode on working board: 0.721v

D704 diode on faulty board: 0.066v
D704 diode on working board: 0.067v

D703 contact points on faulty board: 0.72v
D703 contact points on working board: 0.721v

D704 contact points on faulty board: 0.518v
D704 contact points on working board: 0.068v

So the only difference is on the D704 contact points. What does that suggest?

fzabkar wrote:
ISTR a thread where it was claimed that all 4 serial flash memories (IC9 - 12) need to be transferred. BTW, you should back up the contents of these chips if you can find someone competent (eg hdd-parts.com) to do this for you.

Thank you, I'll see if there's anyone in my area who can do the backups. Is there a device I can use to do it myself (after having someone remove the chips) or is that too expensive/risky?

fzabkar wrote:
As for testing the PCB, that other HDD Guru thread (https://forum.hddguru.com/viewtopic.php ... 21#p255121) confirms that your PCB has no overvoltage protection (the diodes provide reverse polarity protection), so there will most likely be damage to the ICs rather than the diodes. Hopefully the serial flash ICs have survived.


:(
My hope was that since the PCBs seem to have a different design (mine are likely newer, and notably lack the IC17 chip. they also have a different layout/shape in general) that there would be some better overvoltage protection, or at least something to reduce potential damage to the ICs. Do you think that could be the case? Is there some test I could do at the moment to check the health of the serial flash ICs?


Top
 Profile  
 
 Post subject: Re: Toshiba Hard Drive not working after Power Supply swap
PostPosted: February 6th, 2019, 18:24 
Offline
User avatar

Joined: September 8th, 2009, 18:21
Posts: 11610
Location: Australia
The D704 diode test results are too low, even for the working board. :? Note that there is small smt fuse to the right of the "72" Schottky rectifier. It appears to be open circuit on your faulty board, which in turn suggests that there may be more problems further downstream.

BTW, the unpopulated locations at D703 and D704 appear to have been reserved for TVS diodes. It's too bad that Toshiba didn't think the extra few cents were worth spending. :-(

Here is the other thread I was thinking of:
viewtopic.php?f=1&t=37261

_________________
A backup a day keeps DR away.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 5 posts ] 

All times are UTC - 5 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 26 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group