TVS diode location

[littlemoule]

hi all,
so i plugged in wrong SATA cables and shorted out the PCB on my Hitachi Ultrastar 2 TB.
rather than replacing the PCB. I would like to fix this by removing (or jumping?) the TVS diode.
can anyone help me find the location of it? And should I jump it using a piece of wire or remove it completely?
completely newbie, no heat gun, no soldering iron on hand. But can get one.
https://i.imgur.com/LUImBKS.jpg

Last edited by littlemoule on April 27th, 2020, 10:38, edited 1 time in total.

[littlemoule]

Forgot to show a picture of the PCB, here it is:
https://imgur.com/a/6D8bxLJ

[lifeguarddubai]

check the attached picture better replace them if Data is important visit any Data Recovery Professional near you it wont cost much for electric problem,

Attachments

[northwind]

http://www.users.on.net/~fzabkar/HDD/TVS_diode_FAQ.html

[littlemoule]

thanks for the reply.
I actually ended up snipping (cutting off) all three of those diodes. But still no power.
I notice that the board gets hot on one of the right hand corner of the area (those circle thingies on the right).

Just ordered a PCB, Data is important so I am hoping a new PCB will do the job. I guess I'll have to transport the ROM chip from the old PCB to the donor.

[littlemoule]

Any further thoughts/suggestion are welcome as I wait for the new PCB to arrive. What sucks is that I will need to get someone to solder the ROM chip from the old PCB to the new one.
I suppose there might be a way to flash it by capturing the ROM from old bios chip and then flashing it to the ROM chip that already comes with the new PCB. But I am not sure how to do that, I heard people have done something similar using a programmer/raspberry pi. I would be curious.

[littlemoule]

How much should I be looking at to pay for someone to replace/resolder the bios chip?

[northwind]

I expect fzabkar to jump in any time now and tell you that a "ROM" transplant shouldn't cost more than 10 quid.

My suggestion since your data is valuable: contact member pcimage at www.pcimage.co.uk and ask them to help you. They're in Peterborough. A simple PCB swap shouldn't be costly.
I think you've fiddled with it enough already, but it's your data, so your choice.

[littlemoule]

thank you. The only problem is that I'm in canada. So not sure if sending the drive to them would be feasible. But I might be able to get someone to solder it here for me since I have already ordered a PCB (cost $40 CAD for replacement PCB).

[fzabkar]

Which diode was shorted? I suspect it was the 5V TVS diode (SUA GP205), in which case there is a slight risk that the preamp may have been damaged.

A "ROM/NVRAM transplant" shouldn't cost more than US$50. Contact hdd-parts.com (they are located in Canada).

However, a transplant shouldn't be necessary if one of the two fuses is open. If there is no other damage, just flow a blob of solder over the relevant fuse. That should cost you nothing. The fuses are the small components to the left of each of the two diodes. ("14" is the 12V TVS diode)

[littlemoule]

hi fzabkar,
while I wait for the donor board to arrive (was ordered from Israel through Ebay). I want to try your suggestion. The thing is I'm a noob, so without pictures, I cannot piece together which component you are talking about to solder over (where is this fuse?)

[northwind]

thank you. The only problem is that I'm in canada. .

Oh so you meant British Columbia on your location. My bad.

Replacing a PCB when the preamp is toast is VERY risky and can end up with your drive being unrecoverable. Just my $.02

[littlemoule]

i'm just hoping it's not the pre-amp then. Would would be the best way to go about this then? If i'm not replacing the PCB, then what DIY option do i even have left.

[northwind]

If your preamp is gone, it's not DIY. It needs clean room work.
If it's not gone, then you can replace the PCB and recover your data.

[littlemoule]

Okay sounds good, I am just waiting for the PCB, I will report back how the repair goes.

Can you clarify though on what you meant by 'if the pre-amp is gone, then you risk losing your data by replacing the PCB'?

[fzabkar]

I notice that the board gets hot on one of the right hand corner of the area (those circle thingies on the right).

You haven't measured anything, so it's not possible to help you. However, if you are referring to the HR and DL coils, then that could point to a problem with the Vcore supply voltage for the MCU chip. If so, then a PCB swap would be preferable.

[lcoughey]

My experience has been that when people determine that the PCB is bad, they go through the steps to replace/fix it without any consideration that there may be other issues. In many cases, they don't even bother saving the data off the drive and just continue to use it, thanks to poor advice by those assisting them with the repair.

I just finished a case with a Toshiba 2.5" drive with a blown fuse. Had they just got the board repaired, they would have left with a crashing hard drive that would have likely resulted in them losing all their data.

Our jobs aren't to offer cheap repair without any care for the data. Our jobs are to recover data without any unnecessary risks.

[littlemoule]

can moderator remove the post made by lcoughey, It most definitely comes across as soliciting.

[lcoughey]

can moderator remove the post made by lcoughey, It most definitely comes across as soliciting.

Not soliciting at all. Just making an observation with a real case example.

[ddrecovery]

can moderator remove the post made by lcoughey, It most definitely comes across as soliciting.

Not soliciting at all. Just making an observation with a real case example.

He is not soliciting, he is warning you of the dangers of DIY data recovery.