Does this mark mean that the pream is burnt? + picture

[Scorpion]

Hi all,

Does this little circule mark mean that the preamp chip is burnt?
Please notice at the bottom of the chip.

Best Regards,

Attachments

[BlackST]

Unclear picture : can be the FC seal but can be something else.

If you have a DDA you can CLEARLY understand if there is output (and the quality of it) from the preamp, otherwise you can always try a headswap , given that the stack has already removed....

[Scorpion]

Unclear picture : can be the FC seal but can be something else.

If you have a DDA you can CLEARLY understand if there is output (and the quality of it) from the preamp, otherwise you can always try a headswap , given that the stack has already removed....

Actually this is very clear picture. This is what I see with a naked eye.
I tried heads swap and currently the drive is looking for building the NV-RAM since the drive kept being on BSY state.
I suspect that the pc technician who brought in the drive tried to replace the original PCB with some donor and forgot to put it back.

[LarrySabo]

Unclear picture : can be the FC seal but can be something else.

Did you click the image then click it again? Here's part of what I see when I do that...

[Scorpion]

Yes, This is what I am talking about.

[pcimage]

Actually this is very clear picture. This is what I see with a naked eye.
I tried heads swap and currently the drive is looking for building the NV-RAM since the drive kept being on BSY state.
I suspect that the pc technician who brought in the drive tried to replace the original PCB with some donor and forgot to put it back.

IMHO It's very risky to run NVRAM search on drive with head replacement due to the multiple power off/on cycles required.

Secondly, an incorrect PCB wouldn't normally make a drive stay BSY. Normally it would go to DRDY but not initialise.

Thirdly, if it's a fairly new drive then you can find the S/N in the NVRAM dump, so you'll be able to confirm one way or another if the PCB has been changed.

[Scorpion]

Actually this is very clear picture. This is what I see with a naked eye.
I tried heads swap and currently the drive is looking for building the NV-RAM since the drive kept being on BSY state.
I suspect that the pc technician who brought in the drive tried to replace the original PCB with some donor and forgot to put it back.

IMHO It's very risky to run NVRAM search on drive with head replacement due to the multiple power off/on cycles required.

Secondly, an incorrect PCB wouldn't normally make a drive stay BSY. Normally it would go to DRDY but not initialise.

Thirdly, if it's a fairly new drive then you can find the S/N in the NVRAM dump, so you'll be able to confirm one way or another if the PCB has been changed.

Hello,

Found the problem the BSY state was due to bad sector over the GLIST module.
So the original PCB was correct.
I found the problem after 4.5 hours which the drive scanned for the NVRAM and found it.
Currently I succeeded to read all the data out of head number 1 but not with head 0. Head 0 is healthy but every time it updates something to the GLIST on the copy of head 0 then the drive crashes.
What would be happen if I will clear the GLIST totaly out of the drive?
(Will not touch the PLIST. I have backup of the GLIST).

For the first question, is the mark on the preamp means that it was burnt?

[pcimage]

For the first question, is the mark on the preamp means that it was burnt?

Not sure, but you have not told us; 1) the actual initial symptoms or 2) whether you've tried the heads in the donor

In my experience a bad preamp would cause the drive to spin up and come DRDY, but close listening to the drive would reveal that the heads do not move out from the ramp.

Hope it helps?

[Scorpion]

For the first question, is the mark on the preamp means that it was burnt?

Not sure, but you have not told us; 1) the actual initial symptoms or 2) whether you've tried the heads in the donor

In my experience a bad preamp would cause the drive to spin up and come DRDY, but close listening to the drive would reveal that the heads do not move out from the ramp.

Hope it helps?

The actual initial symptoms were light clicking noises out of the drive. Hardly notice noises.
But when I put donor PCB to the drive then really bad clicking noises come out of the drive.
I made heads swap and solved the clicking noises.
I put the original PCB back to the drive and then were the light clicking noises again. With donor PCB with NOT the original NVRAM I got full access to the SA but didn't got drive ID recogniztion.
So I thought that the original PCB is not really the original one so I run a scan for finding the NVRAM out of the drive.
When I got the NVRAM I made the right changes to make it fit to the USAG module and wrote it back to the NVRAM donor PCB chip.
Right after writing the new NVRAM to the PCB the light clicking noises started again.
I did few tests and play around with the drive then I got full ID recogniztion.
I notice that the RDMT (GLIST) module which head 0 copy cause the drive to crash everytime it being update so I recovered all the data using head 1 ONLY.

Now I have to read the data by head 0 too but the drive is still on BSY state and I can't make it being recognize again.
The heads are GOOD I cheacked. It is SA problem.
I thought about clearing the GLIST by usin different NVRAM.
What do you think about doing that?
(I have backup of the GLIST).

[Scorpion]

Case solved.
Only the picture is the issue now. Is this mark means that the preamp is burnt?

[fzabkar]

What I would do to answer that question is to measure the DC voltages at the HDA contacts of a working PCB when attached to your donor headstack, and then compare them against your patient headstack. It won't give you a complete picture, but it should find any obvious faults.

[Scorpion]

Solved too.
This mark doesn't say that the preamp is burnt.
The heads are fully working on another drive..

Thanks for your comments.

[jignesh]

What I would do to answer that question is to measure the DC voltages at the HDA contacts of a working PCB when attached to your donor headstack, and then compare them against your patient headstack. It won't give you a complete picture, but it should find any obvious faults.

Dear Friend fazabakr

Definaly u r right i am also do it this way i have some other good technic too.

yours friend
jignesh pankhania