Hi,
I have nearly dead Seagate Momentus 7200.4. After powering up the disk I hear about 11 ticks (done by heads). Motor is working OK.
When I'm connecting via TTL cable I get:

and after pressing Ctrl+Z:

The problem is that I can only execute commands in first seconds - switching modes seems to work, Ctrl+X dumps data, spin down (Z) throws error LED:000000CE - as supposed - it should only work after few seconds after powering on. Sometimes Z throws DiagError 00005014. But basically terminal freezes when command is send after more than 10 seconds after power on - I have to reconnect power to access console again. Even Q does the same.

Disk contained important data but owner gave up so I can even damage disk but I would like to make it working.

What can I do to fix controller?

11 clicks then spin down?

If yes, then it's a physical head issue.

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Without spin down - motor seems to work normally.

As far as I have experienced, this series does not spin down. Had drives with platter damage and did not spin down.

For this one, it's heads and possible platter damage, typically on surface 0.

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Hard Disk Drive (HDD), Solid State Drive (SSD, SATA, NVMe, etc), USB Flash Drive and RAID Data Recovery Specialist in Massachusetts

So there is no chance to repair it except replacing platters or heads?

No, this one needs new heads...and maybe several set of heads, it depends how bad the surface is.
And yes you can replace the platters, but it's not going to be your info on them.

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I opened disk. You were right: ends of heads are creased

Thanks... This series drives is tricky, sometimes they spin down, sometimes they do not, despite being damaged in either situation.

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Hard Disk Drive (HDD), Solid State Drive (SSD, SATA, NVMe, etc), USB Flash Drive and RAID Data Recovery Specialist in Massachusetts