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 Forum: Conventional hard drives   Topic: Western Digital - WD30EZRZ - Dead Drive - Voltage Spike

Posted: Yesterday, 18:17 

Replies: 3
Views: 97


T stands for 'fuse' in this case :). I would suspect one of the TVSes (on the right of T2) to be shorted, so check those as well. Replacing it (the fuse of course) with a 0 ohm resistor or some kind of similar fuse. if you want to use the drive i recommend ...

 Forum: Conventional hard drives   Topic: Help identifying diode to remove on shorted Hard drives

Posted: June 29th, 2020, 20:02 

Replies: 9
Views: 605


You shouldn't be shorting fuses without confirming that there is no other damage. My FAQ specifically warns against this.

Did you measure the TVS diodes in the WD80EFAX?

 Forum: Conventional hard drives   Topic: Help identifying diode to remove on shorted Hard drives

Posted: June 29th, 2020, 19:07 

Replies: 9
Views: 605


... Tried to short the blown fuse - Not successful HDS5C3030ALA632 - 0J11430 BA3895A 2TB - Tried to short the blown fuse did not work so I removed 5V TVS, Stil does not spin up. ST8000DM004 - 100802503 REV A - STICKER 2504 G - Have not removed PCB yet.

 Forum: Conventional hard drives   Topic: Help identifying diode to remove on shorted Hard drives

Posted: June 29th, 2020, 8:10 

Replies: 9
Views: 605


Here are the model numbers: Hitachi 2TB: 0F12117 (HDS5C3020ALA632)- Shorting fuse and removing 5V TVS did not work WD 8TB: WD80EFAX-68LHPN0 - Shorting blown fuse did not work Seagate 8TB: ST8000DM004 - Have not removed control board yet. Is it possible to read/flash the ...

 Forum: Conventional hard drives   Topic: Help identifying diode to remove on shorted Hard drives

Posted: June 28th, 2020, 21:30 

Replies: 9
Views: 605


Thanks for the reply. The fuse that goes into the 5V TVS was definitely blown. I shorted the fuse with a small wire, but the drive still won't spin up. Do you think i should try removing the 5V TVS. I do get resistence across the 5V TVS, but it's half ...

 Forum: Conventional hard drives   Topic: Help identifying diode to remove on shorted Hard drives

Posted: June 28th, 2020, 18:20 

Replies: 9
Views: 605


TVS Diode FAQ:
http://www.hddoracle.com/viewtopic.php?f=100&t=86

 Forum: Conventional hard drives   Topic: WD Drive Power issues

 Post subject: Re: WD Drive Power issues
Posted: June 25th, 2020, 2:18 

Replies: 23
Views: 1979


You can replace it with an smt fuse, or just flow a blob of solder over it. Earlier drives just had a TVS diode, no fuse.

 Forum: Conventional hard drives   Topic: WD Drive Power issues

 Post subject: Re: WD Drive Power issues
Posted: June 23rd, 2020, 15:22 

Replies: 23
Views: 1979


A 12V TVS diode can be substituted with an SMBJ12A, and a 5V TVS diode with an SMAJ5.0A. It's all explained in my FAQ.

TVS Diode FAQ:
http://www.hddoracle.com/viewtopic.php?f=100&t=86

 Forum: Conventional hard drives   Topic: HGST US7SAk600 (6TB TVS HELP)

Posted: June 23rd, 2020, 15:18 

Replies: 5
Views: 498


The fuses are OK. Just remove the 12V TVS diode. Don't bridge anything.

 Forum: Conventional hard drives   Topic: HGST US7SAk600 (6TB TVS HELP)

Posted: June 23rd, 2020, 15:04 

Replies: 5
Views: 498


The two fuses you highlighted are showing 0 ohm reading for resistance, the 5V TVS shows a 2.2k Ohm resistance and the 12V TVS shows a reading close to 0, it starts to read it and then drops down to 0 for reading. If I remove and bridge the fuses and 12V TVS is ...

 Forum: Conventional hard drives   Topic: WD Drive Power issues

 Post subject: Re: WD Drive Power issues
Posted: June 23rd, 2020, 14:08 

Replies: 23
Views: 1979


I would love to put a new TVS in, and the resistor too if it would add to the insurance. I searched for the datasheet or any material about the TVS (VU SLIG GP442) and could not find much except a maybe ST brother. I hope it doesn't affect ...

 Forum: Conventional hard drives   Topic: HGST US7SAk600 (6TB TVS HELP)

Posted: June 22nd, 2020, 15:55 

Replies: 5
Views: 498


Normally what happens is that the 12V TVS diode becomes shorted and the associated fuse goes open. However, your measurements would tend to discount this. Are you sure that "Z4" is not measuring close to zero ohms? The fuse may in ...

 Forum: Conventional hard drives   Topic: WD Drive Power issues

 Post subject: Re: WD Drive Power issues
Posted: June 22nd, 2020, 15:37 

Replies: 23
Views: 1979


I would spend my money on a new drive and keep the current one as a backup. A TVS diode costs $1, so that's cheap insurance.

 Forum: Conventional hard drives   Topic: HGST US7SAk600 (6TB TVS HELP)

Posted: June 22nd, 2020, 14:09 

Replies: 5
Views: 498


If you have access to a working PCB make sure that firmware listed on drive label is the same and move Winbond flash chip from not working PCB to good one.
Make sure that PCB is from the same family (Ultrastar 7k6000). It may be lower capacity.

 Forum: Conventional hard drives   Topic: HGST US7SAk600 (6TB TVS HELP)

Posted: June 22nd, 2020, 12:30 

Replies: 5
Views: 498


... read online that simply replacing the PCB would not be the way to go, I am handy with a soldering iron / rework station but I am unsure where the TVS is on this unit and how to replace it. Here is a zoomed in photo of the components where I think the TVS is placed, the top right component is connected ...

 Forum: Conventional hard drives   Topic: HGST US7SAk600 (6TB TVS HELP)

Posted: June 22nd, 2020, 11:56 

Replies: 5
Views: 498


... read online that simply replacing the PCB would not be the way to go, I am handy with a soldering iron / rework station but I am unsure where the TVS is on this unit and how to replace it. Here is a zoomed in photo of the components where I think the TVS is placed, the top right component is connected ...

 Forum: Conventional hard drives   Topic: WD Drive Power issues

 Post subject: Re: WD Drive Power issues
Posted: June 22nd, 2020, 1:50 

Replies: 23
Views: 1979


... even 1% of the drive. If the hard drive dies tomorrow I couldn't care less. I'll use it as a nondependent backup drive. Clarifying, without the TVS on the 5 volt rail, any power surge on that rail could cook chips as there's nothing else to sacrifice itself? And IIRC from other threads, This ...

 Forum: Conventional hard drives   Topic: WD Drive Power issues

 Post subject: Re: WD Drive Power issues
Posted: June 18th, 2020, 23:24 

Replies: 23
Views: 1979


As far as suggesting a professional, I would love if I could try fzabkar's trick first and if it fails then sent off without additional fees. If it works, get a new TVS ASAP.

 Forum: Conventional hard drives   Topic: Help identifying an element on a Western Digital PCB

Posted: June 2nd, 2020, 10:57 

Replies: 2
Views: 1015


... and wrong cables, and luckily (kinda) the grounds and the 3V was the same, but the 5V and 12V were swapped, with predictable results. Now I tested TVS diodes D3 and D4 and they seem to be fine, no beep on the multimeter. The R43 resistor is, of course, dead, as it's sitting on the 5V rail, so I'll ...

 Forum: Conventional hard drives   Topic: TVS diode location

 Post subject: Re: TVS diode location
Posted: May 12th, 2020, 18:51 

Replies: 29
Views: 7121


AIUI, server drives often fail with media damage. I would think that server environments are about the best that a drive will see, yet they still fail.
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