You are right.
It's spinning but not working, sorry for the wrong answer. It worked until new reboot.

Looking better at two PCBs I would say that those PCBs are not compatibile beacuse of difference in the components. Maybe the preamps are not the same and use different voltage, resistance and capacity. To be sure he must use the same PCB as old one just to avoid possible incompatibility of that part of PCB.

Hm, what do you mean with "worked until new reboot"?

And that would also explain the fact that new pcb doesnt spin old drive when conected with head conector but spins when not conected. The issue is pcb revision is the same, right ? And original pcb suffered a power surge frow psu... So i would still go for shorted pre-amp rather then incompatible pcb, but maybe some expert can help.

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I was able to read Data after flashing EEProm. But after reboot, I wasn't able to do so. I can't either connect with WDR to reflash ROM.

This is VERY BAD. We bricked the good Pcb. Does the drive spins ? If so try to isolate conection to head stack, on the new disk with new pcb and flash back New Rom . If doesnt work you will need the external programer. We are making the situation way worse and we might have well broke the new drive pcb for good...

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It's spinning, an I can hear some noise from the heads. But I'm not able to connect via WDR. I'm going to use the external programmer and flash the ROM.

Well, I'm now lost in all your posts with not so clear infos and descriptions.

For the non working drive (new) issue let's start from this:

You said that hdd was working until reboot so my question is: with which one pcb and which one ROM content was working until reboot.

Do the drives have to bre recognized by BIOS to work properly with WDR?

It worked with new PCB with old ROM content on new drive.

The pcb is not bricked because it spins up the drive.

If this really happened (with different ATA version!?!?!) I suppose the drive made a changes in firmware (like SMART modules) with bad adaptive save settings so the modules are badly saved and maybe some of them or even tracks damaged.

What can also be problem is that because of different (noncompatibile) adaptives in rom the new drive made a phisical damage on platters/heads.

You should try to write back original content to rom on the new drive pcb and if there is no damaged modules/tracks/platter/heads it should work.

i would try to flash back the new pcb with the original content by isolating head stack, WDR should be able to write then, drive will not read sa from platter and WDR should be able to flash back the ROM.

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try to insulate connection to head stack as you have done on the old pcb. Heads will not read from platter, drive will go to safe mode and you should be able to use the wrd to flash back correct firmware. If so, do that, shut down pc power and test new drive again.

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As I said before to him "You can not do anything without tools, knowledge and experience. Sorry for saying but you have nothing of those"

People dont born knowin everything, we are taking risks but hopefully learning from them.
Next step is to "fix" the new drive. I still think that the problem is just incorrect ROM. Whem the system was power of instead of reboot, drive read content of ROM to power up and content dont match firmware on platter. It shouldnt have afected firmware on platter. WDR should be able to reflash Rom if pcb is started without connection to head assembly.

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.......

But how to fix the new drive when he doesn't know anything about how hdd works and don't have tool to diagnose what is wrong with it. It seems to me that this is neverending story because from one bad drive he now have two bad drives and if he goes on with "fixing bad drives" he will soon have more bad good drives.

So I really thinks the best solution for him is to learn about drives and experiment with lot of good drives before try to fix a bad ones.

All what he achieved is to read/write rom content and made a good drive not working anymore. I'm sorry to say and don't want to be rude but s..t happens especially because of lack of knowledge. I know that because I still have my first Maxtor 6E040L0 which was good until my novice "experimenting" with drives. I keep it just for remember me on my first and wrong steps.

So I repeat, he should try to write back original content to rom on the new drive pcb and if there are no changed modules or damaged modules/tracks/platter/heads it should work.

People shouldn't do things thay don't know and if they do, must be prepared on consequences.

I'm interested to know how drive gonna act with original rom content.

Learning DR have its risks, and we are lacking expensive tools.
I still think that the WDR should be able to flash the ROM again to its original state if used with pcb without connection to head stack. If not a external programer is required.

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Major problem is lack of better tools...

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