November 29th, 2022, 19:16
November 30th, 2022, 5:57
November 30th, 2022, 6:19
November 30th, 2022, 6:36
pepe wrote:it needs a man to read all this
pepe wrote:i see a couple of contradictions:
- you talk about a 18TB drive while later mention WD2002FYPS-01U1B0, which is 2TB, can be shown as 1.8, so isn't a decimal dot missing somewhere?
pepe wrote:- WD gold 18TB is He filled, i highly doubt you would ever be able to achieve a successful head transplant on such thing, not to mention the need to interact with frimware.
pepe wrote: 771642 board does not have external rom, it is internal to the MCU, but can be read and written with appropriate tools.
pepe wrote: You can't damage the board by plugging power connector in reverse due to the missing alignment tab, because the connector has no contacts on the other side. The only way you could damage it is to plug it misaligned, but that's also very hard, if not impossible due to the housing of the connector.
pepe wrote:You mentioned nowhere if the drive spins up at all, does it?
pepe wrote: The thing is bleeding from several wounds now, I don't think there would be many enthusiasts willing to hold your hand through this process, it is simply because it takes shitload of time to assist remotely in such situation, i would probably recover this drive several times before we get anywhere remotely. Yes, this costs some bucks but...
There are a lot of posts of fzabkar about how to do basic diag on PCBs, you may find them useful, but i am not even sure the problem is in the PCB, might be h.
November 30th, 2022, 6:47
November 30th, 2022, 7:06
pepe wrote:if it is spinning, very low chance the problem has anything to do with the board.
more probably firmware or heads.
November 30th, 2022, 7:19
November 30th, 2022, 8:22
TakeTwo wrote:Just a guess, but there is a rather large empty header which is probably used for JTAG. Somewhere on this board someone reverse engineered the pinout but I don't know if it is the same for each vendor/board. Maybe you can dump relevant data through the header and flash it to the new chip. It maybe wouldn't even require soldering to connect to the right JTAG pins.
November 30th, 2022, 8:40
November 30th, 2022, 11:39
If you send THEM (eg. WD in this case) your drive, all they do is plug-a-port and then the $$ starts flowing in!
Perfect business practice!
November 30th, 2022, 12:33
pepe wrote:If you send THEM (eg. WD in this case) your drive, all they do is plug-a-port and then the $$ starts flowing in!
Perfect business practice!
pepe wrote:they won't give a damn for your data, nor repair your drive of such age. so no $$$ to wd.
pepe wrote:my oppinion is that you are wasting time on jtag, coz it is not the board you have problem with.
pepe wrote:Contact Northwind if you want your data back before you shred it for good.
November 30th, 2022, 12:39
November 30th, 2022, 12:50
fzabkar wrote:If you upload a photo of your PCB, I'll show you the supply voltage test points (3.3V, 1.2V, etc). This will help us to determine whether it may be possible to read the ROM contents directly from the PCB.
November 30th, 2022, 13:00
November 30th, 2022, 13:20
fzabkar wrote:Measure the voltages at L1, L2 and Q1.
November 30th, 2022, 14:48
But i disagree that the board is what i have a problem with because we are talking about the donor board with the older chip.
Board is fine and harddrive is recognized correctly and spins and idles till i get it some cylinder data!
portable multimeter i have here has no voltage measuring capabilities
December 1st, 2022, 3:22
pepe wrote:But i disagree that the board is what i have a problem with because we are talking about the donor board with the older chip.
Board is fine and harddrive is recognized correctly and spins and idles till i get it some cylinder data!pepe wrote:because the donor board very probably cannot load fw from SA due to version mismatch and it gives some ID with 0 LBA capacity probably. You could check that in linux using hdparm.
So i would be very careful about blaming the board. I give it like 1% chance.
I understand your logic and see where it goes wrong, that's it.
we are getting to the critical topic length i was talking about in the first post
portable multimeter i have here has no voltage measuring capabilities
pepe wrote:
never seen such thing, apart from an LCR meter i too have
December 1st, 2022, 6:03
pepe wrote:
Contact Northwind if you want your data back before you shred it for good.
pepe
December 1st, 2022, 6:54
December 1st, 2022, 13:21
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