Seagate Exos X16 PCB shorted somewhere

[saltwater]

Hi friends!

I have a case , and i need some help.

The patient is a Seagate Exos X16 ST14000NM001G drive. The customer plugged a modular power supply with a wrong pinout cable.
The result:
-the drive not spins up.
-motor controller chip is heats up.
-power consuption only on 5V rail, but the there are short only on 5V rail

Tested TVS diodes, all works fine.

In the image below is circled the shorted parts of PCB (picture used from other post)

Thanks for any suggestion.

[Lardman]

https://forum.hddguru.com/viewtopic.php?t=42344

Follow the 12v rail from the sata power connector. and check the "efuse" as it sounds like you haven't.

[saltwater]

Thanks the link!
You're right, i did not check efuse, because i don't know wich one is . But anyway! If the efuse cause the problem, is there a way to bypass os reset it, or i have to replace it?

[fzabkar]

Thanks the link!
You're right, i did not check efuse, because i don't know wich one is :oops: . But anyway! If the efuse cause the problem, is there a way to bypass os reset it, or i have to replace it?

The other ICs I have identified are e-fuses. Examine the datasheets, identify the Vin and Vout pins, and then measure the voltages at these pins. You should see 5V and 12V at the inputs and also at the outputs. If Vout is missing, then either the e-fuse has failed, or the output of the fuse is overloaded. To confirm that there is no overload, measure the resistance between ground (a screw hole ) and Vout. If there is no short at Vout, then you can bridge Vin and Vout with a wire or blob of solder.

MP5000S, Monolithic Power, 12V, 1A - 5A Programmable Current Limit Switch, marking ADT, QFN10:
https://www.monolithicpower.com/en/documentview/productdocument/index/version/2/document_type/Datasheet/lang/en/sku/MP5000S/document_id/1651/

MP5018, Monolithic Power, 5V, 1A-5A Current Limit Switch with Reverse Current Blocking & Output Over-voltage Clamp, marking AMAy, QFN-12:
https://www.monolithicpower.com/en/documentview/productdocument/index/version/2/document_type/Datasheet/lang/en/sku/MP5018/

Don't mess with that diode. It is not a TVS diode.

I can't identify the markings on your 5V e-fuse, but it should be pin compatible with the MP5018.

That said, it does appear that 5Vout is shorted to ground. If so, then you will need to remove the 5V e-fuse.

Last edited by fzabkar on August 5th, 2024, 12:51, edited 1 time in total.

[saltwater]

My mistake, NOT the motor controller chip heats up, but this component:

[fzabkar]

"This component" is the 5V e-fuse. Did you not read that other thread???

[saltwater]

"This component" is the 5V e-fuse. Did you not read that other thread???

Thanks Frank, i read, but so many things i don't understand.
Removing 5V efuse and bridging pins the right method?

[saltwater]

Solved!

Thanks Lardman, and Frank!