SCSI PCB troubleshooting

[enroute2]

Had no power on a SCSI 246 gig ( seagate ) model st31500341. It has the 80 pin port with no jumpers.
Swapped the rom to donr, and now powers, but no id.

Anyone with the skill to help troubleshoot patient or ... ?

Please pm if possible, it is easier for me.

[labtech]

What do you see in the BIOS while booting up? Is the drive recognized at all? If yes, what is the capacity displayed in BIOS?

[enroute2]

Thanks for the prompt reply.

It does id the drive with correct size.
Update:
Just put the drive on scsi duplicator and id’s the make and model. It powered on, then clicked once and didn’t id at first. The power to the drive turned off and on, then the drive identified.

We are copying the data to another drive now, but the device shows it is copying all errors as if the pcb doesn’t know where to find the data. So I am afraid it is still not working properly.
Obviously wondering if it is another chip or firm. W/o the scsi pc3, not much I can do otherwise.

[labtech]

Just to confirm, you are using a SCSI duplicator?
Like this one: http://www.wytron.com.tw/picture/dd-6k-6.jpg?

If yes, duplicators are not very successful with this.

Do you have any professional data recovery tools?

[enroute2]

yes. most every tool except scsi pc3.

if you pm me, i'll send my e-mail

[guru]

sure you exchanged the EEPROM ? Any pic?

[enroute2]

Positive, m29 large

[enroute2]

sure you exchanged the EEPROM ? Any pic?

Attachments

[fzabkar]

Had no power on a SCSI 246 gig ( seagate ) model st31500341. It has the 80 pin port with no jumpers.
Swapped the rom to donr, and now powers, but no id.

Anyone with the skill to help troubleshoot patient or ... ?

Do you still need help to troubleshoot your board?

Do you have a multimeter, and do you know how to use it?

Did you check the +5V fuse, polyswitch, or whatever it is?

FYI, I believe this is the pinout for the connector:
http://www.allpinouts.org/index.php/SCS ... fferential)_SCA_80_pin

[enroute2]

Still could use any assistance. Yes, know how to use the basics.
The pinouts help.
May need to swap rom back to patient. Donr w patient rom didnt work. Drive id's correct make and size, but doesnt doesnt access data.

[fzabkar]

"st31500341" is an incomplete model number, ie it has no interface suffix. Moreover, the "1500" indicates that the drive has a 1.5TB capacity. Furthermore, the YYWW date codes (0446, 0445, 446, 448) on the ICs indicate that the drive was manufactured during late 2004, which is well before such capacities appeared in the marketplace. My Google searches for the PCB # (100326127) turned up a model number of ST336807LC, which is a 36GB drive. There is 146GB Cheetah 10K.7, but I can't find any mention of a 246GB model. I suspect that you in fact have an ST3146707LC.

Now that we have that out of the way, I would start by measuring the voltages in the following photo clips:
http://www.users.on.net/~fzabkar/HDD/ST3146707LC/

You have a good board for comparison purposes, so I would measure its voltages before working on the patient. I presume you have backed up the flash memory.

I can't see the markings (eg FDFSxxxx) on many of the components, so I may be wrong in some of my interpretations. To this end, it would help me if you could provide those numbers.

FYI, the cable pinouts are on pages 76 and 77 of the manual.

Cheetah 10K.7 36GB SCSI Product Manual:
http://www.seagate.com/staticfiles/supp ... 58430a.pdf

Cheetah 10K.7 SCSI (ST3300007LW/LC, ST3146707LW/LC, ST373207LW/LC) Product Manual:
http://www.seagate.com/staticfiles/supp ... 60915d.pdf

[enroute2]

Fzabkar,

You are correct on the model error. I was leaving on vacation and quickly grabbed the wrong mode. The correct model is BD14688278. However, we did check the obvious tvs issues. There is one larger chip (marked with a question mark in your pic) that may be a diode between the two tvs chips that don't provide a reading. We compared the boards, but saw no anomaly.
Because we don't have the adapter for this unusual flash, we could not back it up.
Also, you mentioned, "I can't see the markings (eg FDFSxxxx) on many of the components." Are you referring to the cpu or a particular small chip?
Still need help.

[fzabkar]

I can only help you with the electronics aspect of your problem.

To this end I need to see the results of your voltage measurements.

The FDFSxxxxx chips are those 8-pin ICs that form part of the DC-DC converters. They would probably be FETKYs. If you can read off their markings, that would help me.

I don't know what you mean by "diode between the two tvs chips". To which photo clip are you referring? Is it this one?
http://www.users.on.net/~fzabkar/HDD/ST ... e_fuse.jpg

The item I have queried as a possible fuse may in fact be an inductor. The component above it is a 33uF 16V capacitor. The two components may form an LC low pass filter. Either way, the fuse/inductor should measure close to 0 ohms. Can you tell me the marking on the diode?

[Doomer]

It's not a PCB problem. At least not only
If drive spins up and IDs with donor's PCB and original flash that means PCB is working fine and flash is fine
But if drive doesn't read that would indicate another problem
First of all what size does drive report?

[enroute2]

Doomer,

I am inclined to agree with you. I have to spend a few minutes reading through the notes. I wish they would make an easy scsi adapter so I could run an express or some other test on it to see the status. At this point, maybe also a bad preamp..

Franc,
You are correct on the chip location. I'll need to grab the magnifier to look at the chips.

[enroute2]

New developments:

We fixed the patient board enough to power- bad diode or some chip.  Not an obvious tvs.

The duplicator sees pcb size and model correctly and the drive doesnt click with patient pcb.  

Computer management doesnt even see the drive at all.  Oddly, Ghost sees the drive but stops on cloning  and shows a read error on sector 0 shortly after starting the clone.
?

[labtech]

Likely you got bad sectors. You need to attempt imaging the drive with professional equipment. Never mentioned if you have any data recovery advanced tools.

You were asked what size the drive shows up as in bios, but never answered.

Last edited by labtech on July 17th, 2011, 20:56, edited 1 time in total.

[enroute2]

In the process, but it seems like maybe something else

[Doomer]

What size the drive showing right now?

[enroute2]

Shows correct size of 149gb. Actually shows in device manager, but not in management.