To reinforce the idea, you could also go through this :
which is also a sticky.
The disk operates more or less like this:
- the disk microprocessor boots by reading the contents of a flash chip <-(imagine it as something like a BIOS)
- then executes some instructions in it
- then reads some data from the actual disk surface (stored in areas that are not normally accessible)
UNLIKE normal BIOSes, the contents of the flash chip are partially CODE (the same for all chips with a same firmware) and partially "local" addressess/settings DATA that are specific to the disk that is "coupled" to the PCB.
You CANNOT swap a PCB.
You CAN however swap a PCB IF you "transplant" the "old" chip on the "new" PCB (AND if the "new" PCB is 100% compatible).
This is something that needs a little bit more experience than the average DIY guy, but that is entirely doable with all in all cheap and readily available tools (magnifying lens, soldering iron (or better a resoldering station) some soldering paste, etc.)
There are tools (that sell for several thousands US$ AND need some specific "advanced" training) that are able to:
- read the whatever is in the chip (both CODE and DATA)
- correct the whatever is in the chip (both CODE and DATA)
- load partially CODE or DATA (from the chip and from an external source)
- read the whatever is on the disk platter
- correct the whatever is on the disk platter
Right now for all we know the issues you are having could be connected to one or more than one among:
- corrupted data in the chip "code" part
- corrupted data in the chip "data" part
- corrupted data on the disk
- failure of the disk head(s)
- failure of the disk self-positioning head arm
- failure of *any* component on the PCB
to which you add that we don't really know for sure IF your cable/adapter (or the settings you are using or even the connection you made) are "good" and working.
So, your next step would be to get another (working) 7200.11 and test if your procedure work for accessing it (and if it doesn't change the adapter/procedure)
Given that you succeed (i.e. that your tools and procedure are correct) you have a PCB that doesn't respond.
The next step would be to get yourself a compatible set of tools (and if you have no experience with this learn to solder/desolder tiny surface mounted components - as said doable but not easy-peasy) and transplant the chip from the "old" PCB to the new one.
In, say, the 75% of cases where you will manage to make the transplant without frying the chip, you will have access to the PCB terminal, then, you will have NO IDEA (just like we have none ) of the following steps (commands to issue, etc.) which, even if known, may work in say 25% of the cases, in another 25% you will need to use a loader because the contents of the chip are corrupted, in another 25% of the cases you will need to replace a head assembly (which is NOT a DIY job unless you spend a few thousands dollars in tools, training, etc.) and in the remaining 25% the actual disk is really "gone for ever" and no data can be retrieved from it anyway.
To sum up (given that it is a generic, undiagnosed "click of death" and NOT a BSY and NOT a LBA0), if you do a PCB swap:
in 25% of cases you will fry the chip in the transplant
in 75%*25% of cases=18.75% you did i right but DO NOT know what to do next
in 2*75%*25% of cases=37.50% you did i right but have NO WAY to perform next step
in 75%*25% of cases=18.75% you did i right but THERE IS NOTHING to be done
Since 25%+18.75%+37.50%+18.75% sum up to a neat 100%, you have NO chance in practice to revive that disk AND you have big chances to accidentally make things so worse that even a professional service that has *some* chance to get the data now from the disk "as is" will have no chances left after.
Of course the above calculations are totally faked, and it is entirely possible that if any of the percentages adopted are wrong you have some teeny-tiny possibilities, but I wouldn't count on them.
I understand how sad it is , but you have to evaluate attentively the above before deciding for:
- ask for a professional service repair
- give up and call it a day
- something else