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 Post subject: Re: SanDisk X100 256G no BIOS detection
PostPosted: June 17th, 2018, 4:34 
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Joined: January 10th, 2016, 18:26
Posts: 21
Location: romania
Relevant photos, I think.


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 Post subject: Re: SanDisk X100 256G no BIOS detection
PostPosted: June 17th, 2018, 5:41 
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Joined: January 10th, 2016, 18:26
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Location: romania
Bad action :D


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 Post subject: Re: SanDisk X100 256G no BIOS detection
PostPosted: June 17th, 2018, 16:26 
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Joined: September 8th, 2009, 18:21
Posts: 10482
Location: Australia
ICBW, but ISTM that the "FF" in the Err register suggests that the drive could be brain dead. Alternatively, it could just be that the drive does not communicate until it has loaded its firmware.

I would check the crystal and the outputs of each of the supply supervisor ICs. If the crystal is not oscillating, or if one of the supervisors is holding the flash controller in the reset state, then that could explain the symptoms.

BTW, you can use a TSR program called Snarf to capture MHDD screen shots.

Snarf - Tool to capture full-screen DOS graphics :
http://www.hddoracle.com/viewtopic.php?f=36&t=2334&p=15796

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 Post subject: Re: SanDisk X100 256G no BIOS detection
PostPosted: June 18th, 2018, 3:47 
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Joined: January 10th, 2016, 18:26
Posts: 21
Location: romania
Crystal Oscillator is the one I have noted X100 ?!
I do not know what time I have to make measurements today, the lack of time kills me :( .
Thanks for the suggestion with snarf app, it is very useful and i will put it on all computers. I did not think of doing research for such a solution.


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 Post subject: Re: SanDisk X100 256G no BIOS detection
PostPosted: June 18th, 2018, 15:26 
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Joined: September 8th, 2009, 18:21
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alindumitru46 wrote:
Crystal Oscillator is the one I have noted X100 ?!

Yes.

Generally speaking, when you troubleshoot a microprocessor based PCB you ...

1/ check the supply voltages
2/ check the crystal oscillator
3/ verify the power-on reset pin(s)

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