OCZ Vertex 450 schematic

[b0baT]

Hi All !
My ancient SSD burned out. I want to restore information. I found a capacitor that is heating up a lot, but I don't know what to replace it with. C105. Thanks in advance for your suggestions.

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[fzabkar]

Remove it and run the SSD without it.

[b0baT]

Do you think it is just filter, 1uF ?

[fzabkar]

There doesn't appear to be any DC-DC converter on the other side of the PCB, so I think it's probably a filter.

[b0baT]

I measured it with a tester. The capacitor behaves as it should. First it shows low resistance, then it shows infinity. I don't understand how it can be hot. Only if there is AC going through it

[b0baT]

The resistance between +5 and ground is about 80ohm. I don't think it should be like that.

[fzabkar]

If that capacitor is responsible for the 80 ohms reading, then that's not enough to shut down the 5V supply. This means that the real problem is elsewhere. Your capacitor is then a secondary, non-fatal problem.

I would measure the outputs of the DC-DC converters. If these are OK, then the firmware has probably "panicked" due to bad NAND.

I this model has a UART port that provides diagnostic output.

[b0baT]

How to understand where to measure DC ? Do you think inductors like L1 and so on can be good points ?

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[fzabkar]

Measure the voltages at L2, L3, L4 adjacent to U17 (TPS652510).

https://www.ti.com/lit/ds/symlink/tps652510.pdf

I can't identify the markings on U19, but I suspect that this is an LDO regulator.

[fzabkar]

U19 is RT9166-25PXL.

RT9166-25PXL, Richtek, 2.5V 0.3A Ultra-Fast Transient Response LDO Regulator, marking JB-, SOT89:
https://www.richtek.com/assets/product_file/RT9166=RT9166A/DS9166A-24.pdf

https://images.bit-tech.net/content_images/2013/09/ocz-vertex-450-256gb-review/vertex450-7b.jpg

[b0baT]

L3 - 0
and see pictures. I have tried to find more as 5V, but not.

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[fzabkar]

Measure the resistance between L3 and ground (any screw hole). If this is shorted, then hopefully it will be due to a shorted capacitor. The missing voltage at this point appears to be ~3V, which is the Vcc for the NAND flash array.

BTW, I don't understand why you are seeing 4V instead of 5V at those test points. ?

[b0baT]

As you see input is 5V, but on LDO is 4V. Seems some element is draining 1V.
According PDF :
Buck1 = 1.2 V Buck2 = 1.8 V Buck3 = 3.3 V

[b0baT]

have not found 0R on L and capacitors. But voltage is less as expected in many points.
See pic.

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[fzabkar]

Check R64 (near L3).

[b0baT]

R64 - 0 as expected.
I tested very carefully all capacitors. Except this list all of them as expected:
C55 - 75 Ohm
C129, C184, C155, C146 - around 90 Ohm.

[fzabkar]

Maybe I was wrong about the screw holes. Instead, I would use SATA power ground as the 0V reference.

There is a small inductor, L1, in series with the 5V supply.

A resistance of ~100 ohms is normal for the Vcore supply for the flash controller.

What is the resistance between the Vin pins of the LDO regular, DC-DC converter and SATA 5V?

Check the ENable pin for the 3.3V converter.

[b0baT]

Thanks a lot. You are wizard Resistance was higher as expected to have on L1, I replaced it to any I have and just see picture.
Now all measures are 5V, where before were 4V.

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[fzabkar]

It appears that the failure of C105 may have stressed L1.

[b0baT]

Maybe this topic will help someone else to repair OCZ Vertex 450.