WD SSD Nvme short circuit

[steven668]

hello...have a Nvme drive it has short circuit. the red mark on photo getting hot when power on. i can't find part to replace it. so may be some one can help me to make this drive can on again.

thanks

Attachments

[lcoughey]

Buy another one and transplant the chip.

[fzabkar]

Buy another one and transplant the chip.

Don't do this.

That IC is a dual P-channel MOSFET. It functions as the main power switch for the SSD and is probably controlled by the DevSleep pin on the NVMe interface.

You can simply bypass this switch by bridging its drain and source pins with a wire.

PMPB20XPE, NXP, -20V, -10.3A, P-channel Trench MOSFET, marking 1D, DFN2020MD-6 (SOT1220):
https://assets.nexperia.com/documents/data-sheet/PMPB20XPE.pdf

That said, there could be a short circuit to ground downstream from this MOSFET. Start by measuring the resistance between each of its pins and ground.

If all is OK, then locate the inductors on the PCB and measure their resistance to ground. These will be the onboard power supplies.

Here are SSDs with similar PMICs:

https://forum.hddguru.com/viewtopic.php?f=10&t=40315
https://forum.hddguru.com/viewtopic.php?f=10&t=37027

[fzabkar]

That IC is a dual P-channel MOSFET.

Sorry, it's a single MOSFET, but the advice remains the same.

[steven668]

thank fzabkar for useful information

so i remove this chip and try find source and drain pin. drain pin is connected to ground. it will short if i connect source and drain

Attachments

[fzabkar]

There must be problem in one of the two regulators or their capacitors. Don't short the drains and sources.

Look for shorts near U36 and U35.

https://i2hard.ru/upload/iblock/cc4/cc4038fec1e70d136a69940c2b1e0354.jpg

[steven668]

There must be problem in one of the two regulators or their capacitors. Don't short the drains and sources.

yes, found shorted cap. removed and drive worked well.

thanks a lot fzabkar

[DR-Kiev]

And which capacitor was shorted?

[fzabkar]

Just FYI, this is U36 (the two ICs are functionally equivalent).

NCP6343B, ON Semiconductor, step-down buck converter, 1.225V, 3.0A, marking 6343B, WLCSP15:
https://www.onsemi.com/pdf/datasheet/ncp6343-d.pdf

RT8088A, Richtek, Step-Down Converter with I2C Interface, 2.7MHz, 3A, 2.5V - 5.5Vin, 1.225V default, marking 1Jx, WL-CSP-15B:
https://www.richtek.com/assets/product_file/RT8088A/DS8088A-00.pdf

[Amarbir[CDR-Labs]]

There must be problem in one of the two regulators or their capacitors. Don't short the drains and sources.

yes, found shorted cap. removed and drive worked well.

thanks a lot fzabkar

Question ,
Just as Dr Kiev Asked And also was that Mosfet OK ,Or you bypassed it after removing shorted CAP

[steven668]

And which capacitor was shorted?

it near power Chip (U35)

sorry for delay reply, not usually login this site

[Amarbir[CDR-Labs]]

And which capacitor was shorted?

it near power Chip (U35)

sorry for delay reply, not usually login this site

And mosfet did you replace or bypass

[ovovo]

And which capacitor was shorted?

it near power Chip (U35)

sorry for delay reply, not usually login this site

I've similar problem, sudden failure of WD SN730 drive. Please mention what exactly is the capacitor that was removed, so that I can test that too, on my drive there are about 5 capacitors around PMIC showing short, one of them seems to be blown or one side of it is scrapped.

The marked capacitors with red dot are shorted, with one marked in circle greyed out.

[ovovo]

And which capacitor was shorted?

it near power Chip (U35)

sorry for delay reply, not usually login this site

I've similar problem, sudden failure of WD SN730 drive. Please mention what exactly is the capacitor that was removed, so that I can test that too, on my drive there are about 5 capacitors around PMIC showing short, one of them seems to be blown or one side of it is scrapped.

IMG_20250729_113306.jpg

The marked capacitors with red dot are shorted, with one marked in circle greyed out.

Update: Greyed out capacitor (near U35 was indeed short and after removing it, my issue also solved.

[manunoghi]

Please tell me which capacitor you found in short. I have the same problem. It gets very hot and it doesn't see it in Bios

[manunoghi]

Please tell me which capacitor you found in short. I have the same problem. It gets very hot and it doesn't see it in Bios