HUS722T1TALA600 with non sense information after PCB swap

[parmindo]

Hello guys, good day.
I have here a HUS722T1TALA600, with PCB 2060-800032-004 that was swapped due to a short circuit.
HDD works flawless, but there is only randon "garbage" reading sectors.
I'm in doubt if someone have experience with this model and if someone knows if it can be encrypted by PCB change (maybe encryption based on MCU).
Thank you in advance for any information.

[fzabkar]

Did you check the two fuses ("s") and two e-fuses? You can bypass these components ...

[parmindo]

I've got another donor and made tons of tests. This model doesn't have anything on PCB, even ROM, that makes it impossible to read with a donor PCB.
Unfortunately information on this drive was messed up before came to me. Sorry for anoying friends here.

[fzabkar]

Can you upload a photo of the patient PCB? Power problems are usually easy to fix.

Otherwise, you could outsource your job to @jtb1982. He appears to have electronics troubleshooting ability.

[parmindo]

Can you upload a photo of the patient PCB? Power problems are usually easy to fix.

This is the original PCB. None of the diodes present are on short circuit (d1 and d2 from 12v and 5v aren't present even on donor that is working).
There are no "s" fuses.
Thank you so much for all your patience @fzabkar

Attachments

[fzabkar]

Measure the resistances between ground and each of 5Vout / 5Vin and 12Vout / 12Vin. If there are no shorts, then measure the voltages at those points.

MP5014A, Monolithic Power, 12V, 5 A, Programmable Current-Limit Switch with Over-Voltage Clamp and Slew-Rate Control, marking AMJy, TSOT23-8:
https://www.monolithicpower.com/en/documentview/productdocument/index/version/2/document_type/Datasheet/lang/en/sku/MP5014A/

MP5013A, Monolithic Power, 5V, 5A Programmable Current-Limit Switch with Over-Voltage Clamp and Slew-Rate Control, marking AMKy, TSOT23-8:
https://www.monolithicpower.com/en/documentview/productdocument/index/version/2/document_type/Datasheet/lang/en/sku/MP5013A/

Attachments

[parmindo]

fzabkar, No shorts on both. 4.8V on MP5013A and 12.26V on MP5014A

[fzabkar]

Can you measure the voltages D3, D4, C150/C158/C127?

Also measure the voltages at L2, C120, C163? Can you identify the marking on U6?

Also measure the voltages at L1, L3, L4, L5, L6, D5, D6, D8.

Attachments

U6.jpg (83.94 KiB) Viewed 3264 times

[parmindo]

Well.. this is being a big lesson for me.
I've found that sometimes this PCB wasn't getting 12V on MP5014A Vout immediately.
Sometimes it does, most of the time don't.
Most of the time, when it stay turned off for a period, the MP5014A was taking a lot of time to reach 12V on Vout. And then, after something around 4 min, it reaches 12V and MCU get a little warm.
So... I was able to switch MP5014A from a donor and this PCB was returned to life, and customer information was there.
This was a huge lesson to me, because I really wasn't trusting that this model had any issue related to being necessary the original PCB. I've got two identical HDDs and was able to write data and read with each of their PCB swapped, regardless even any BIOS swap.
It was proven to me that my customer case was able to retrieve data only using the original PCB, and this makes me see that I really need to study a lot more.
Thank you so much fzabkar... I'm still not understanding why I was capable to read and write information on these two other identical HDDs, but you teach me a huge lesson that I should try to use the original PCB every time it is possible, even more on a model that I'm not used to deal.

[fzabkar]

In future, just connect a bridging wire between Vin and Vout. There is no need to cannibalise a working donor PCB. In this case you could have bridged Vin and Vout with a blob of solder.