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 Post subject: Re: SanDisk X100 256G no BIOS detection
PostPosted: May 10th, 2018, 8:46 
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Joined: January 10th, 2016, 18:26
Posts: 11
Location: romania
Okay, I'm fundamentally wrong that I'm ashamed to say what happened.
New measurements, re-made in a hurry...


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 Post subject: Re: SanDisk X100 256G no BIOS detection
PostPosted: May 10th, 2018, 16:09 
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Joined: September 8th, 2009, 18:21
Posts: 10355
Location: Australia
@alindumitru46, it appears that none of the regulators (U1, U12, U17) are getting a 5V supply, yet +5V is present at the MOSFET switch (U119). This implies that the supplies are being switched by a second stage.

Can you tell us the markings on U121, U123, U2, U3, U13? I suspect that one or more of these may be load switches.

BTW, DEVSLP is pin P3 of the SATA power connector. When P3 is 0V, power is switched on. When P3 is 3.3V, power is switched off.

SATA Device Sleep (DEVSLP or DevSleep):
http://www.hddoracle.com/viewtopic.php?f=46&t=2094&p=16074&hilit=devslp#p16074

BTW2, I don't understand where your negative voltage readings come from ???

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 Post subject: Re: SanDisk X100 256G no BIOS detection
PostPosted: May 10th, 2018, 16:43 
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Joined: January 10th, 2016, 18:26
Posts: 11
Location: romania
U121-OL7/03,
U123-Z25X,
U1-OAL/32J/P67T,
U2-T9A/OT,
U3-3XT/1A,
U13-U6A/0H

BTW1: I suspected what you said about DEVSLP, but I do not know how to interpret the values ​​of the measured voltages :?: .
I'm gonna ask someone to redo those measurements tomorrow.
BTW2: I do not even understand, but the multimeter does not have thin probes, and I'm not really good at it.


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 Post subject: Re: SanDisk X100 256G no BIOS detection
PostPosted: May 10th, 2018, 17:09 
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Joined: September 8th, 2009, 18:21
Posts: 10355
Location: Australia
Sorry, I can't identify those IC markings. :-(

My next approach would be to measure the voltages at all those small ICs. I would also determine their supply and ground pins by testing for continuity between the IC pins and ground, and between the IC pins and the +5V Switched test point (with power off).

U3 looks like it might be an LDO regulator.

ISTM that the solution might be a simple one, but getting there might take some time.

This is the MOSFET switch:

NTHD4102P, ON Semiconductor, -20V, -4.1A, Dual P-Channel ChipFET, marking C7:
http://www.mouser.com/ds/2/308/nthd4102p-d-1194494.pdf

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 Post subject: Re: SanDisk X100 256G no BIOS detection
PostPosted: May 14th, 2018, 0:09 
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Joined: September 8th, 2009, 18:21
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@alindumitru46, it may be easier for you if you measure the voltage between each end of each capacitor rather than referring to a PCB ground.

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 Post subject: Re: SanDisk X100 256G no BIOS detection
PostPosted: May 14th, 2018, 8:49 
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Joined: January 10th, 2016, 18:26
Posts: 11
Location: romania
I struggled all weekend because I do not have the necessary probes :). And my friend, who should have helped me, is on vacation for a few days.
I return after doing both myself and the measurements independently.
Thank you very much for yor help :)
Maybe I'll find another hdd for work, if I still started research on this forum :).


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 Post subject: Re: SanDisk X100 256G no BIOS detection
PostPosted: May 15th, 2018, 19:37 
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Joined: September 8th, 2009, 18:21
Posts: 10355
Location: Australia
I'm not sure that these are all correct ...


BU4327FVE, Rohm, 2.7V voltage detector, marking OL, SOT-553/VSOF5/SOP4:
http://rohmfs.rohm.com/en/products/data ... 2xxg-e.pdf

XC6118N16AGR-G, Torex, Voltage Detector with Separated Sense Pin & Delay Capacitor Pin, 1.6V, marking U6A, USP-4:
https://www.torexsemi.com/file/xc6118/XC6118.pdf
http://www.mouser.com/ds/2/760/XC6118-837414.pdf

XC6118N09AGR-G, Torex, Voltage Detector with Separated Sense Pin & Delay Capacitor Pin, 0.9V, marking T9A, USP-4:
https://www.torexsemi.com/file/xc6118/XC6118.pdf
http://www.mouser.com/ds/2/760/XC6118-837414.pdf

XC6221B251GR, Torex, LDO regulator, 2.5V, 200mA, marking 3XT, USP-4:
https://www.torexsemi.com/file/xc6221/XC6221.pdf

NC7SZ125P5X, Fairchild, TinyLogic UHS buffer, tristate out, 1.65V - 5.5V, marking Z25, SC70-5:
https://www.mouser.com/ds/2/149/NC7SZ125-1011470.pdf
https://www.jameco.com/Jameco/Products/ ... 874197.pdf

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