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gameboybin
 Post subject: Re: ADATA Premier Pro SP900 shorting everywhere
PostPosted: July 9th, 2026, 19:03 
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fzabkar wrote:
A Vcore voltage of 1V is OK, as I understand it. The supply voltage seems unaffected by the low resistance. I just don't understand why your two Vcore resistance readings differ.


What can a half bad resistor do?? I mean something is definitelly affecting the Vcore resistance at the resistors
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fzabkar
 Post subject: Re: ADATA Premier Pro SP900 shorting everywhere
PostPosted: July 10th, 2026, 10:14 
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gameboybin wrote:
fzabkar wrote:
A Vcore voltage of 1V is OK, as I understand it. The supply voltage seems unaffected by the low resistance. I just don't understand why your two Vcore resistance readings differ.


What can a half bad resistor do?? I mean something is definitelly affecting the Vcore resistance at the resistors

Measure the resistance between the L2 inductor and your "shorted" capacitors. Is it 0 ohms?

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gameboybin
 Post subject: Re: ADATA Premier Pro SP900 shorting everywhere
PostPosted: July 10th, 2026, 15:15 
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fzabkar wrote:
gameboybin wrote:
fzabkar wrote:
A Vcore voltage of 1V is OK, as I understand it. The supply voltage seems unaffected by the low resistance. I just don't understand why your two Vcore resistance readings differ.


What can a half bad resistor do?? I mean something is definitelly affecting the Vcore resistance at the resistors

Measure the resistance between the L2 inductor and your "shorted" capacitors. Is it 0 ohms?


They have from 190 to 220 ohms

Attachment:
SHORTING POINTS 200.JPG
SHORTING POINTS 200.JPG [ 555.83 KiB | Viewed 1751 times ]


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gameboybin
 Post subject: Re: ADATA Premier Pro SP900 shorting everywhere
PostPosted: July 10th, 2026, 15:32 
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Location: Vietnam
gameboybin wrote:
fzabkar wrote:
gameboybin wrote:
fzabkar wrote:
A Vcore voltage of 1V is OK, as I understand it. The supply voltage seems unaffected by the low resistance. I just don't understand why your two Vcore resistance readings differ.


What can a half bad resistor do?? I mean something is definitelly affecting the Vcore resistance at the resistors

Measure the resistance between the L2 inductor and your "shorted" capacitors. Is it 0 ohms?


They have from 190 to 220 ohms

Attachment:
The attachment SHORTING POINTS 200.JPG is no longer available


I have this Strange resistor. It is not shorted to ground. However when measured between the inductor. It beeps and shows 1 ohm on 1 side and 200 on the other
Attachment:
2 FRONT.jpg
2 FRONT.jpg [ 474.8 KiB | Viewed 1743 times ]


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Lardman
 Post subject: Re: ADATA Premier Pro SP900 shorting everywhere
PostPosted: July 10th, 2026, 15:40 
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Can you take a better picture so we can see what the component you mean and the circuit board / traces around it.

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gameboybin
 Post subject: Re: ADATA Premier Pro SP900 shorting everywhere
PostPosted: July 10th, 2026, 15:59 
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Lardman wrote:
Can you take a better picture so we can see what the component you mean and the circuit board / traces around it.


Here you go

FRONT
Attachment:
BETTER FRONT.jpg
BETTER FRONT.jpg [ 1.06 MiB | Viewed 1737 times ]


BACK
Attachment:
BETTER BACK.jpg
BETTER BACK.jpg [ 1.08 MiB | Viewed 1737 times ]


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fzabkar
 Post subject: Re: ADATA Premier Pro SP900 shorting everywhere
PostPosted: July 10th, 2026, 17:43 
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I think that the anomaly can be explained by power sequencing.

I believe that U6 is a dual step-down converter, MP5506, by Monolithic Power. Unfortunately I can't find a datasheet.

Q1 and Q2 are N-channel MOSFETs (DMG6968U). They appear to be switching the two outputs of the buck converter (1.0V and 2.9V) on and off under the control of U6. The reason that you measure different resistances is that you are measuring different sides of the MOSFET switch when it is turned off. When then SSD is powered on, the switches are closed (MOSFETs turned on) and the voltages are the same on both sides (Drain and Source). In fact, please measure the voltage at the VCC_NAND-Switched test point.

It would appear that one of those capacitors is leaky, but not shorted. This does not prevent the Vcore supply from coming up.

In short, I believe the low resistance is a distraction and the actual problem is firmware related.


DMG6968U, Diodes Inc, N-ch MOSFET, marking 2N4, SOT23:

https://www.diodes.com/datasheet/download/DMG6968U.pdf


Attachments:
MP5506_switched_outputs.jpg
MP5506_switched_outputs.jpg [ 593.39 KiB | Viewed 1703 times ]

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fzabkar
 Post subject: Re: ADATA Premier Pro SP900 shorting everywhere
PostPosted: July 10th, 2026, 18:15 
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This is U5.

MP2136, Monolithic Power, stepdown converter, 2.5V - 6V Input, 2MHz, 1A, marking 6Q, QFN6:

https://www.farnell.com/datasheets/2914869.pdf

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fzabkar
 Post subject: Re: ADATA Premier Pro SP900 shorting everywhere
PostPosted: July 10th, 2026, 18:44 
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Code:
         .--------------------------.
         |                          |
         |                          |
         |            .------.      |         .-----.
         |            |      |      |         |     |
         |           ---    ===     |        ---   ===
   .-----------. L3  ---    GND     ===      ---   GND
   |   on/off  | ___  |             |^| Q2    |
   |           |-UUU--+-------------+|+-------+-------o   VCC_NAND_switched
   |           |    VCC_NAND
   |           |
   |  MP5506   |
   |           |
   |           | ___ Vcore
   |           |-UUU--+-------------+|+-------+-------o   Vcore_switched
   |   on/off  | L2   |             |V|       |
   '-----------'     ---         Q1 ===      ---
         |           ---              |      --- 20 ohms
         |   210 ohms |               |       |
         |            |               |       |
         |           ===              |      ===
         |           GND              |      GND
         |                            |
         '----------------------------'

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pepe
 Post subject: Re: ADATA Premier Pro SP900 shorting everywhere
PostPosted: July 11th, 2026, 9:18 
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Posts: 4770
Location: Hungary
Quote:
because the light indicators on PC3000 Portable Pro only shows that way when there is a short on the board. If the board is not shorted the light should came in BSY if there is a problem with Firmware of the drive

Attachment:
Screenshot 2026-07-09 085120.png


this only means the sata interface is not configured, which happens when fw fails to load as well. Since in rom mode it works well, it points towards fw corruption. I aslo met this kind of thing in the past...

verifying supply rails is a good idea, but most likely the issue is fw related.

pepe

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fzabkar
 Post subject: Re: ADATA Premier Pro SP900 shorting everywhere
PostPosted: July 11th, 2026, 10:44 
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pepe wrote:
verifying supply rails is a good idea, but most likely the issue is fw related.

Is 20 ohms a normal resistance for this core? My understanding is that Sandforce didn't use ARM cores, so a figure of ~100 ohms may not be a reasonable assumption.

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fzabkar
 Post subject: Re: ADATA Premier Pro SP900 shorting everywhere
PostPosted: July 11th, 2026, 16:44 
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This document has a block diagram which confirms the three supply voltages -- 1.8, 1.0 and 2.85V.

SandForce SF2000 Reference Design and Evaluation SSD:

https://www.seagate.com/files/www-content/product-content/lsi-fam/enterprise-flash-controller/en-us/docs/enterprise-sf-2000-refevalssd-ds1829-1-1409us.pdf

Interesting blog:

SandForce SF-1200 & SF-2200 SSD Controller Architecture:

https://rossmanngroup.com/services/ssd-data-recovery/sandforce-controllers

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gameboybin
 Post subject: Re: ADATA Premier Pro SP900 shorting everywhere
PostPosted: July 11th, 2026, 19:58 
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Joined: April 17th, 2022, 22:39
Posts: 238
Location: Vietnam
fzabkar wrote:
I think that the anomaly can be explained by power sequencing.

I believe that U6 is a dual step-down converter, MP5506, by Monolithic Power. Unfortunately I can't find a datasheet.

Q1 and Q2 are N-channel MOSFETs (DMG6968U). They appear to be switching the two outputs of the buck converter (1.0V and 2.9V) on and off under the control of U6. The reason that you measure different resistances is that you are measuring different sides of the MOSFET switch when it is turned off. When then SSD is powered on, the switches are closed (MOSFETs turned on) and the voltages are the same on both sides (Drain and Source). In fact, please measure the voltage at the VCC_NAND-Switched test point.

It would appear that one of those capacitors is leaky, but not shorted. This does not prevent the Vcore supply from coming up.

In short, I believe the low resistance is a distraction and the actual problem is firmware related.


DMG6968U, Diodes Inc, N-ch MOSFET, marking 2N4, SOT23:

https://www.diodes.com/datasheet/download/DMG6968U.pdf


Can you point out for me whera ar the VCC_NAND-Switched test points?
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fzabkar
 Post subject: Re: ADATA Premier Pro SP900 shorting everywhere
PostPosted: July 11th, 2026, 20:07 
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It's marked in the top right of my annotated photo clip.

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gameboybin
 Post subject: Re: ADATA Premier Pro SP900 shorting everywhere
PostPosted: July 12th, 2026, 7:48 
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gameboybin wrote:
fzabkar wrote:
I think that the anomaly can be explained by power sequencing.

I believe that U6 is a dual step-down converter, MP5506, by Monolithic Power. Unfortunately I can't find a datasheet.

Q1 and Q2 are N-channel MOSFETs (DMG6968U). They appear to be switching the two outputs of the buck converter (1.0V and 2.9V) on and off under the control of U6. The reason that you measure different resistances is that you are measuring different sides of the MOSFET switch when it is turned off. When then SSD is powered on, the switches are closed (MOSFETs turned on) and the voltages are the same on both sides (Drain and Source). In fact, please measure the voltage at the VCC_NAND-Switched test point.

It would appear that one of those capacitors is leaky, but not shorted. This does not prevent the Vcore supply from coming up.

In short, I believe the low resistance is a distraction and the actual problem is firmware related.


DMG6968U, Diodes Inc, N-ch MOSFET, marking 2N4, SOT23:

https://www.diodes.com/datasheet/download/DMG6968U.pdf


Can you point out for me whera ar the VCC_NAND-Switched test points?


VCC NAND TEST POINTS are 2.8V
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fzabkar
 Post subject: Re: ADATA Premier Pro SP900 shorting everywhere
PostPosted: July 12th, 2026, 7:59 
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That's OK.

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gameboybin
 Post subject: Re: ADATA Premier Pro SP900 shorting everywhere
PostPosted: July 13th, 2026, 15:53 
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fzabkar wrote:
That's OK.


oh well
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gameboybin
 Post subject: Re: ADATA Premier Pro SP900 shorting everywhere
PostPosted: Today, 5:10 
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fzabkar wrote:
That's OK.


So i just found a board with the same Controller. However not the same layout. However i think the volt stages should be the same
I measured these caps that on the 1V rail. And they are not shorted. All of them shows 200 ohms-250 Ohms

So there is definetelly a short on my SSD. Where is the short i don't know yet

Attachment:
DUNG FRONT.jpg
DUNG FRONT.jpg [ 88.55 KiB | Viewed 190 times ]

Attachment:
DUNG BACK.jpg
DUNG BACK.jpg [ 92.07 KiB | Viewed 190 times ]


I measured these ones
Attachment:
DUNG MEASURE.jpg
DUNG MEASURE.jpg [ 93.57 KiB | Viewed 190 times ]


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fzabkar
 Post subject: Re: ADATA Premier Pro SP900 shorting everywhere
PostPosted: Today, 5:37 
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The Vcore supply powers the controller. The controller is obviously working, so the low resistance can only be due to a leaky capacitor. A short would shut down the supply, which is clearly not the case here.

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Lardman
 Post subject: Re: ADATA Premier Pro SP900 shorting everywhere
PostPosted: Today, 14:13 
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I went down a similar rabbit hole with a sandisk SSD I swore blind was a hardware problem. Im sure Franc remembers the case :lol: after 8 donors and a full nand and controller swap with an identical donor pcb I finally accepted it was firmware and nothing more could be done despite what it looked like to me. I was trying to fix the fault I wanted it to be rather than the fault it was - expensive lesson.

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