June 27th, 2015, 4:58
June 27th, 2015, 15:04
June 27th, 2015, 15:32
June 28th, 2015, 5:54
danikd wrote:Hello,
great investigation, thank you!
Its seems to be the right IC. And is orderable via ebay and Mouser.
The pad under is really grounded, pin 5 is ground, but on SSD PCB is not connected, because IC is grounded via large pad - and pin 5 - as is in datasheet - is internally grounded.
Pin 6 is really grounded via cap on ssd PCB, so it is OK too.
Pin 7 - EN - is connected to 5V input on second side of the PCB, see photo, so its enabled right by 5V sata voltage.
Dimension are same, 3x3 mm
5A seems odd ... dont know ...
And yes, 5V Guill input is connected to 5V output of ther burned JS4NAM
C1 and C2 are OK, not shorted, resistance in MOhms, C1 has 63μF and C2 128μF.
I measured all caps on both sides, quick test, seems to be no short.
Thx
Daniel
June 28th, 2015, 15:26
fzabkar wrote:As for the grounded underside of the package ...
June 29th, 2015, 14:11
June 29th, 2015, 14:45
June 30th, 2015, 16:03
June 30th, 2015, 16:52
July 1st, 2015, 9:45
July 4th, 2015, 15:48
July 10th, 2015, 15:37
August 28th, 2015, 4:33
August 28th, 2015, 6:45
March 12th, 2021, 13:09
March 12th, 2021, 14:42
March 16th, 2021, 4:56
fzabkar wrote:If you can show us a photo with the chip removed, we could try to match it up with likely candidates.
Personally, I would measure the resistances between ground and each of the inductors, after removing the chip. This will tell us if any of the loads may have been damaged. Often in cases like this, the input voltage (+5V) punches through the PMIC and damages the other ICs.
March 16th, 2021, 20:34
March 17th, 2021, 10:47
fzabkar wrote:I couldn't find anything in Texas Instruments' lineup. I know Samsung's products often have PMICs with Samsung's own part number and logo, so it might be an in-house part.
It could even be a DIY user programmable PMIC:
https://www.ti.com/power-management/multi-channel-ics-pmic/diy-pmic.html
These are 40-pin PMICs which are configured for various processors:
https://www.ti.com/design-resources/design-tools-simulation/processor-fpga-power/other-processors.html
Other IC makers (eg Active Semiconductor) also produce PMICs which are preconfigured for particular processors. You see them on Sandisk SSDs, but many are custom designs.
The bottom line is that I don't know where to look.
In any case you may be wasting your time if any of the outputs are shorted to ground.
March 17th, 2021, 11:14
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