[The Solution for Seagate 7200.11 HDDs]

The reason of looking for a PCB replacement is that I cannot get any response from the PCB after sending CTRL+Z, so I cannot send any command to it, and I do not know how else I can do but looking for an identical PCB to replace mine and try to unbrick it if it is needed.

And the reason why in the FGA it is said that it won't work is BECAUSE IT WON'T WORK!

If you really want to attempt a PCB swap , you need to ALSO swap the actual chip that holds the specific drive configuration, something that is not really "easy" or at a "normal" DIY level, desoldering and re-soldering tiny surface mounted components (without damaging/overheating them) needs some tools, but mostly experience and familiarity with the procedure that - no offence implied - you seem like simply missing at the moment.

jaclaz

Hello jaclaz,

I know that it is not that easy, if you can tell me another thing to do, I will try it, but I at the moment I do not know what else I can do.

From your answer I understand that every single HD PCB has its unique ROM, thats why I won't be able to find another one wich matches mine. Could you tell my if I am right?

From ebay I have found PCB sellers that tells the same of the need of swapping the ROM.

Thank all of you for you help.

[The Solution for Seagate 7200.11 HDDs]

The reason of looking for a PCB replacement is that I cannot get any response from the PCB after sending CTRL+Z, so I cannot send any command to it, and I do not know how else I can do but looking for an identical PCB to replace mine and try to unbrick it if it is needed.

Do you get a response from the hdd without the PCB connected?

No, I didn't get any response from the hdd without the PCB connected, exactly the same as with the PCB is connected to the HD.

That is the problem, therefore I don't know what I can do.

[The Solution for Seagate 7200.11 HDDs]

Thank you for your anwser BlouBul,

Did you properly isolate your PCB? Try isolating the other set of contacts (if you did the motor contacts, try with the head contacts and vice versa). Check all connections.

I completely removed the PCB from the HD so its completely isolated, and I also connected the GND + Tx + Rx, from the RS232 to the PCB.

The reason of looking for a PCB replacement is that I cannot get any response from the PCB after sending CTRL+Z, so I cannot send any command to it, and I do not know how else I can do but looking for an identical PCB to replace mine and try to unbrick it if it is needed.

[The Solution for Seagate 7200.11 HDDs]

Hello, this is my first post.

I have BSY problem with my HD (BIOS does not recognise it),

but when I try to connect the PC via RS232 TTL 3.3V adapter I can not get any anwer from the HD.

the converter is working because if I sortcut the TX and RX I got the echo.

when I connect the SATA Power to the HD it start spinning so it seems some parts of the PCB are working, and one led from my USB-RS232 adapter stars ligting.

I also tried to change Tx Rx just in case, but it doesn't work.

Could you help me?

I am also looking for a PCB replacement for my HD:

Seagate ST3500320AS Barracuda 7200.11 500GB SATA:

Model: ST3500320AS

Main Controller IC: ST V523C

HDD Motor Combo IC: 100369972

Board Number: 100466725

P/N: 9BX154-303

Capacity: 500GB

Firmware: SD15

Site Code: KRATSG

Date Code: 09085