Hitachi spins but nothing can see it

[hydrox4all]

Hey all,

So I have this Hitachi drive that I cannot get working and can't lose the data.

At first it wouldn't spin up so I swapped the board with an identical drive and was able to get it to spin up, but nothing can see it.

I've found a post here that solved a similiar issue, the resolution was to cut out the 5 and 10 volt diode with the old board back on it's drive. My problem with this is I believe my diodes are testing good.

Both boards:
12v - 200 then reverse - 1 (infinite)
5v - 485 then reverse - 1 (infinite)

the post that I'm referring to is hitachi-750gb-suspect-pcb-problem-t18942.html

[poehere]

If you swap board swap out adaptive. A simple board swap will not work. Move your NVRAM to the new board. A lot of Hitachi that I have had come in here with the motor controler chip bad on them

[hydrox4all]

Is there a way to reset the NVRAM so I might not have to swap it?

[Cleanroom]

no,

read it off with expensive dr tools and copy it over, or remove the chip and solder it on the donor board. it is not a hard swap , it is small thin 8 pin chip

[BlackST]

Is there a way to reset the NVRAM so I might not have to swap it?

Yes, but not by you unfortunately.

[fzabkar]

Could we see a detailed photo of your board? Since you have a multimeter, we may at least be able to measure the supply voltages. That should tell us whether the motor controller is working at least partially.