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 Post subject: SATA M.2 with a big short circuit
PostPosted: March 19th, 2022, 12:34 
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Joined: August 26th, 2021, 17:52
Posts: 61
Location: Brasil
Hello everyone

A client brought me this m2 SATA with a big short circuit, the first time I connected the SSD to the pc3000 this measured in the channel that I connected a voltage of 0,9V and a current of 0,21A.

Device
brand: Crucial
model: CT1000MX500SSD4

And after a while I can identify the power line with the trouble, and I believe the voltages regulator. Which I will describe below.

Thanks to FZABKAR who posted this web page, https://www.ti.com/packaging/docs/partl ... sp#divline, that help me to identify the voltages regulator

IC 1: despite having the marks, I did not find the ic model
marking
AKJ
M13
844


IC2: LP2951-N from texas instruments, the voltage generated by this ic is the one that is short circuited
marking
51A
FL51

IC3 -- IC4 : TLV707
marking
HJ


My first test was to remove the protection diode, but short circuit persist.
After a while of testing, I remove ic2 the voltage don't drop keeps 5v and a consumption of 0,11A, but the short circuit persist, and I started to remove the capacitors. And after removing 10 or 12 caps the short circuit is still present, I don't think an IC is responsible. I don't have a fancy tester, like a keysight, that allows me to isolate the short circuit.
I don't think it's practical to remove component by component if anyone has any advice, I am very grateful.

My best Regards


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 Post subject: Re: SATA M.2 with a big short circuit
PostPosted: March 19th, 2022, 12:45 
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Joined: September 8th, 2009, 18:21
Posts: 15461
Location: Australia
MP2188GQA, Monolithic Power, Dual 3A, 2.5V - 5.5V, 1.2MHz, COT Synchronous Step Down Switchers With Auto Output Discharge, marking AKJ, QFN-6+2+6+2:
https://www.monolithicpower.com/en/documentview/productdocument/index/doc_url/L01QMjE4OF9yMS4wMS5wZGY/prod_id/MTA2NQ/

http://www.users.on.net/~fzabkar/Datasheets/DATAURLS.HTM

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 Post subject: Re: SATA M.2 with a big short circuit
PostPosted: March 19th, 2022, 13:09 
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Joined: November 7th, 2020, 5:31
Posts: 1084
Location: The_UK
I use a can of freeze spray for short hunting as I'm too cheap to buy a thermal camera, not sure how well it would work in your climate though.

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 Post subject: Re: SATA M.2 with a big short circuit
PostPosted: March 21st, 2022, 19:10 
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Joined: September 8th, 2009, 18:21
Posts: 15461
Location: Australia
@jtb1982, did you get any further with this case?

Have you removed IC1 to see if the short goes away? In any case, even if the short persists after removing IC1, you could then power up the SSD and examine the other supplies. It seems strange to me that there are two 3.0V LDO regulators ("HJ", TLV70730), if indeed that is what they are.

Here is a review of the 1TB version of this SSD:
https://www.techpowerup.com/review/crucial-mx500-m-2-1-tb/2.html

The SSD is populated on both sides, so one wonders how the two 3.0V regulators share the load, assuming they power the NAND Vcc.

The SDRAM is a 1.35V IC which can run at 1.5V.

MT41K256M16TW-107:P, Micron, 32 Meg x 16 x 8 banks SDRAM, 1.35V or 1.5V, marking D9SHD, 96-ball FBGA:
https://media-www.micron.com/-/media/client/global/documents/products/data-sheet/dram/ddr3/4gb_ddr3l.pdf
https://www.micron.com/support/tools-and-utilities/fbga?fbga=d9shd

This makes me wonder whether the NAND I/O is also running at 1.5V, but I can't locate its I/O voltage spec.

MT29F1T08EMCAGJ4-5M:A, Micron, NAND flash, 1 Tbit, 128G x 8, 2.7V - 3.6V, marking NW926:
https://www.micron.com/support/tools-and-utilities/fbga?fbga=nw926
https://au.mouser.com/ProductDetail/Micron/MT29F1T08EMCAGJ4-5MA?qs=rrS6PyfT74d3t%2F4Ob%2FBLeg%3D%3D

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 Post subject: Re: SATA M.2 with a big short circuit
PostPosted: March 22nd, 2022, 9:23 
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Joined: August 26th, 2021, 17:52
Posts: 61
Location: Brasil
Lardman wrote:
I use a can of freeze spray for short hunting as I'm too cheap to buy a thermal camera, not sure how well it would work in your climate though.



The drive don't warm up in any moment


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 Post subject: Re: SATA M.2 with a big short circuit
PostPosted: March 22nd, 2022, 9:32 
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Joined: August 26th, 2021, 17:52
Posts: 61
Location: Brasil
fzabkar wrote:
@jtb1982, did you get any further with this case?

Have you removed IC1 to see if the short goes away? In any case, even if the short persists after removing IC1, you could then power up the SSD and examine the other supplies. It seems strange to me that there are two 3.0V LDO regulators ("HJ", TLV70730), if indeed that is what they are.

Here is a review of the 1TB version of this SSD:
https://www.techpowerup.com/review/crucial-mx500-m-2-1-tb/2.html

The SSD is populated on both sides, so one wonders how the two 3.0V regulators share the load, assuming they power the NAND Vcc.

The SDRAM is a 1.35V IC which can run at 1.5V.

MT41K256M16TW-107:P, Micron, 32 Meg x 16 x 8 banks SDRAM, 1.35V or 1.5V, marking D9SHD, 96-ball FBGA:
https://media-www.micron.com/-/media/client/global/documents/products/data-sheet/dram/ddr3/4gb_ddr3l.pdf
https://www.micron.com/support/tools-and-utilities/fbga?fbga=d9shd

This makes me wonder whether the NAND I/O is also running at 1.5V, but I can't locate its I/O voltage spec.

MT29F1T08EMCAGJ4-5M:A, Micron, NAND flash, 1 Tbit, 128G x 8, 2.7V - 3.6V, marking NW926:
https://www.micron.com/support/tools-and-utilities/fbga?fbga=nw926
https://au.mouser.com/ProductDetail/Micron/MT29F1T08EMCAGJ4-5MA?qs=rrS6PyfT74d3t%2F4Ob%2FBLeg%3D%3D



I remove all voltage regulator and the short circuit persist, I am talking with my boss to try to swap the memory and the controller but in my job we don't have much experience with BGA components, and buy a donor is too expensive.


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 Post subject: Re: SATA M.2 with a big short circuit
PostPosted: March 22nd, 2022, 12:30 
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Joined: September 8th, 2009, 18:21
Posts: 15461
Location: Australia
After removing the regulator, the short circuit won't load the 3.3V input, so you should then be able to power up the SSD and measure all the other supplies. Then you'll know which supply is missing, and you'll have a better idea how the power is distributed.

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