Hi guys, need advice regarding damaged pcb in toshiba external 2,5" hdd.

The drive has been fried by plugging accidentaly wrong power supply. The sata-usb board has been damaged as well.
When connected via sata the drive won't spin. I ordered a new pcb from china, new board has the same serial numbers
but differs slightly (see attached pics).

I didn't realize at the time that most hdds need rom swapping before mounting new pcb and changed boards.
After the swap the drive powered and spinned up but started giving wheezy noise and wasnt recognized in bios.

From what i've read on other forums the problem may also be with shorted TVS diodes but unfortunately on my pcb these
were missing (I can see them though on pcb ordered from China).

I took the drive to repair guy and he's told me that simple rom swap to new pcb won't do the good because the pcb I bought
has been made for different purposes (no clue what he's meant by this) and on these models of Toshiba drives some data is
being kept on controller chip different from 8-leg chip (IC 602) which I thought is the only rom chip on the board.

The data on the disk is not worth the cost of recovery at the repair centre but I would be willing to buy another drive like this
and try to swap pcb-s/chips.

Does anybody have any experience with Toshiba 2,5" drives?
Do you think that pcb I bought might be of some use?
What is the chance of me further damaging the drive by swapping pcb without rom swap?
And finally which chips need to be swapped? Is it only IC602 or something else as well?

IC602 swap should be enough to make PCB completely compatible
PCB on the left has accelerometers and additional shock sensors, probably for free fall and shock protection. I doubt it makes significant difference in compatibility

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SAN, NAS, RAID, Server, and HDD Data Recovery.

Hi,
Is the Marvelchip (the large one with an M) the same revision (whats the first line read?...88i...).
IC-602 alone is usaly good.

Cheers/ Bosse

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Rescue IT Datarecovery service Sweden
Rescue IT Dataräddning Göteborg AB
http://www.rescue-it.se

Thanks guys for quick reply.

Yes, both marvel chips are 88i9317-RA12

Do you think these two boards are compatible?

Yes, swap IC then you're good to go

_________________
Rescue IT Datarecovery service Sweden
Rescue IT Dataräddning Göteborg AB
http://www.rescue-it.se

I suspect that the two 16-pin ICs would be dual op-amps rather than accelerometers.

The latter would have the sensor element incorporated within the chip.

Here is an example that I have seen in other drives:
http://www.kionix.com/accelerometers/kxpb5

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A backup a day keeps DR away.

I'm not sure what picture is what, but if you are very lucky the Fuse on your original PCB might have blown from the over voltage. But since I can't find any TVS diode on the board there is a good chance the Preamp inside your drive might have died too.

Short the fuse contacts and see if the drive powers up.

Why would they ever need three shock sensonrs? I've never noticed that on a PCB. The strange thing is two of them being set on the same direction, that's weird in my opinion.

I have seen numerous PCBs with 3 shock sensors. They are angled at either 45 degrees or 25 degrees.

Murata ceramic shock sensors:
http://www.farnell.com/datasheets/58860.pdf
http://www1.futureelectronics.com/doc/M ... 00LD-R.pdf

As for the possibility of preamp damage, I would measure various voltages on the working board to see whether +5V is fed directly to the HDA conector (PJ801).

Start by measuring the voltages at PJ801 itself.

Measure the voltages at the two coils (1R2, L102) and the dotted coil above IC102. These should be Vcore and Vio. It may be that Vio also powers the preamp.

As for bridging fuses, if the drive sustained an overvoltage, and if it has no protection (as appears to be the case), then there will most likely be damage elsewhere on the PCB. In such cases bridging the fuse would be very dangerous IMO.

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A backup a day keeps DR away.