Fuse & TVS Diode for HTS541075A9E680

[jssmith]

Hi guys,

Got a electric surge on a laptop having this drive, it doesn't power up at all, hope it's a PCB problem?

checked 2-3 fuses (yellow) & 2 TVS diodes (red), which I assume they are, looks good. 2 fuses passes current and 2 diodes read as ~600 ohm (on reverse 111 ohm - got this reading when they are on circuit).

Also checked, 4 diodes near SATA connector (blue), they do not seem working! not sure what they are?
Can someone please confirm if my observation is correct?

Many Thanks,
-JS

Attachments

disk.png (319.36 KiB) Viewed 17262 times

[data-medics]

If the drive doesn't power up at all, then you are looking in the wrong place examining components on the SATA lanes.

The readings you get on the diodes sounds pretty normal for good diodes.

The best method here is probably going to be just replacing the PCB along with transferring the IC602 chip.

What makes you assume it's a "power surge" on the laptop? That's pretty rare given that laptops run on batteries.

[jssmith]

Thanks for the directions.
due to a lightning strike from telephone/power line - router, monitor & laptop, all got burnt!
So trying to recover data from the drive now.

Thought of switching with a exact same PCB board, the spec on the drive matches following:

PC Board sticker: OJ14451, DA4740D
P/N: 0J26252
MLC: DA5112
Rev: 220 OA90351 01, 110 OA90351 01 (as per PCB)
Chip: 88i9305-TLA2

e.g. like this one - https://www.ebay.com/itm/HTS541075A9E680-0J14451-DA4740D-0J26252-DA5112-Hitachi-SATA-2-5-PCB/162085081926?hash=item25bd061346:g:4HwAAOSwY0lXSPTM

Does this still need transferring firmware chip from original board? is it correct chip I marked in red?

Many Thanks
-JS

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[fzabkar]

The "diodes" in the blue box are capacitors.

If you place your ear against the drive, can you hear any sound at all?

[jssmith]

no sound at all.

Many Thanks
-JS

[fzabkar]

See https://www.hdd-parts.com/14062934.html

They will transfer the correct chip (you have picked out the motor controller - wrong chip) for no additional fee.

What voltages do you measure at the "1R0" and "H" coils?

[BGman]

(you have picked out the motor controller - wrong chip)

Look for 8-pin chip.

Last edited by BGman on April 18th, 2018, 17:50, edited 1 time in total.

[fzabkar]

(you have picked out the motor controller - wrong chip)

And you are wrong, too!!! This is the DRAM chip.

I'm looking at the red box. Where are you looking?

[jssmith]

Thanks for the guidelines. so it must be the one marked green?

will check the voltage across "1R0" and "H" coils tomorrow.

Many Thanks
-JS

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[rogfanther]

Possibly yes, but what are the markings on the chip ?

[data-medics]

Yes, that's the one. And yes, you'll pretty much always need to transfer that.

[jssmith]

What voltages do you measure at the "1R0" and "H" coils?

is it ok to connect the PCB only (without disk & platters) to the SATA connector to measure the voltage?

btw, what risk (e.g. ESD) I may have if I attempt to transfer the ROM and use soldering iron to solder it (with flux ...etc) as I do not have a advance SMD rework station.

Many Thanks
-JS

[rogfanther]

Possibly, it is okay.

It depends on the soldering iron, and the expertise of the person using it. If you damage the chip, or the pads where it will be soldered to, or the surrounding componentes, it will be game over. So, choose wisely,.

[jssmith]

appreciate all comments so far, they helped me lot.

if I use a donor PCB for this Hitachi drive, does the numbers (first two) on the PC Board sticker need to match exactly?
(in addition to matching board Rev, chip, P/N & MLC numbers and eventually with ROM transfer)


Many Thanks
-JS

[jssmith]

Attempting to repair original PCB seem bit difficult for me. so I ordered a PCB as I described in my previous post.

but I received a wrong PCB with sticker reading 0J21947, DA5260 instead of 0J14451, DA4740D (as per mine)
When quarried with vendor they state that they are still compatible even though sticker mismatches!!!

i.e. they stated that matching the PCB revision and controller chip is enough.

I quickly transferred my ROM to donor board using a new smd rework station but I'm bit scared to use this PCB due to this mismatch.

Can someone please help confirm if this is OK to proceed, and not going to cause any issue to my data or to the ROM/NV-RAM?


Many Thanks,
-JS

[jssmith]

What voltages do you measure at the "1R0" and "H" coils?

I measured the voltage at 1R0=0.7 and H coil=2.4.

Any more suggestion to troubleshoot this board?

Many Thanks
-JC

[fzabkar]

What voltages do you measure at the "1R0" and "H" coils?

I measured the voltage at 1R0=0.7 and H coil=2.4.

I would have expected that the 1R0 voltage would have been closer to 1.0V or 0.9V. What are the corresponding voltages on the donor PCB?

BTW, do you measure 5.0V at the SATA power connector?

[fzabkar]

Are the motor controller (TLS2601) or MCU (88i9305-TLA2) hot to touch?

[jssmith]

I would have expected that the 1R0 voltage would have been closer to 1.0V or 0.9V. What are the corresponding voltages on the donor PCB?

BTW, do you measure 5.0V at the SATA power connector?

my multimeter having a slight error it seems, planning to replace it.
there is a small delta voltage different between each side of 1R0 & H coild - is this 1R0 zero ohm?

my board: 1R0=0.91v & 0.87v and H coil=2.5v & 2.6.
donar: 1R0=0.9v & 0.85v and H coil=2.38v & 2.5.

SATA pin 7-9 has 5V.

Are the motor controller (TLS2601) or MCU (88i9305-TLA2) hot to touch?

they seem normal temperature.

Many Thanks
-JC

[fzabkar]

Those voltages are OK. The differential voltage across the coil is also OK. The voltage you should be measuring is where the coil connects to a capacitor.

http://www.hddoracle.com/viewtopic.php?f=59&t=231&p=16236#p16236